Abstract:The formation of foam is inevitable during pulping and paper making. Improper control of the foam will seriously affect the technic condition executing and the equipment operating of the pulp and paper making process, then result in a decrease in the quantity and quality of the products. It is considered as the simplest and most effective method to regulate and control the foam by the way of adding suitable defoaming agents. This article presented the mechanisms of the foam generating and stabilizing, as well as its influence on the producing and quality of pulp and paper. Then the development, categories, characterizations, cost and practical application of the defoamers used in pulping and paper making were reviewed, according to the special properties and requirements of different procedures including pulping, paper making, coating and deinking. And the developing trend of defoamer for pulp and paper making was prospected finally.

Abstract:The high viscosity and density of heavy oil bring great challenges to its exploitation and transportation. Several methods have been used to reduce the viscosity of heavy oil including dilution, heating, emulsification, but there are a variety of inevitable shortcomings for every methods. Oil soluble viscosity reducers have attracted much attention and shown a good development prospect in recent years for their stable viscosity reduction efficiency, low cost and simple operation. Oil soluble viscosity reducers are mostly developed from the pour point depressants and mainly contains three groups: long-chain alkyl, aromatic groups and polar components. In this paper, the application and molecular structures of oil soluble viscosity reducer for heavy oil are reviewed. The functions of the three key groups in viscosity reduction for heavy oil were analyzed and the previous attempts in the three groups were discussed, the mechanisms of viscosity reduction and the influence of three key groups on viscosity reduction were proposed. In the end, the shortcomings of oil soluble viscosity reducer are pointed out, and some research suggestions are proposed.

Abstract:The superhydrophobic antibacterial surface is to combine the special wetting property of hydrophobic material with the excellent bactericidal property of antibacterial material. Through this "double insurance" method, the long-term antibacterial effect of the surface of various materials such as construction, equipment and fabrics can be achieved, It plays an important role in protecting people's health and prolonging the service life of materials. This paper introduces the preparation methods of inorganic, organic and inorganic-organic superhydrophobic antibacterial surface, and reviews the progress of it in the fields of oil and water separation, antifouling and medical application. Finally, some suggestions are put forward on the development of the surface.

Abstract:The increased resistance of bacteria and the pollution of resistant genes caused by the abuse of antibiotics pose a great threat to human health and ecological safety. How to efficiently remove antibiotic resistant bacteria(ARB) and antibiotic resistant genes(ARGs) in water has become the current research focus. Photochemical advanced oxidation processes (AOPs) can use light irradiation to generate active oxygen species with strong oxidizing properties to oxidize and decompose difficult-to-degrade organic pollutants in water. It has broad application prospects for the removal of resistant bacteria and resistant genes in water. This article firstly introduces the spreading mechanism of antibiotic resistance genes and the status of pollution. Secondly, it summarizes the research progress of photochemical AOPs in the removal of antibiotic-resistant bacteria and resistance genes in water, and analyzes the factors affecting the removal effect and its application. Limitations, and finally pointed out that in the future, the research on the oxidative damage mechanism of AOPs inactivation and the combination of large-scale practical engineering applications should be strengthened.

Abstract:The dynamic imine bond (Schiff base bond) shows good pH responsiveness, reversibility and biological activity. Therefore, the hydrogel fabricated by the imine cross-linkages could be endowed with many new functions. Chitosan is the only alkaline polysaccharide in nature, and the abundant amino groups in the molecular chain provide the possibility of the construction of aldehyde-imine-chitosan (CSB) hydrogel. In recent years, the construction and application of CSB hydrogel have attracted wide attention, and the aldehyde cross-linking molecular structure and the design of cross-linking point have become one of research hotspots. According to the molecular structure of aldehyde crosslinker, the construction method and mechanism of CSB hydrogel, and its properties such as self-healing, drug sustained release, antibacteria, fluorescence and conductivity so on were reviewed in this paper, which could provide theoretical guidance for constructing multifunctional CSB hydrogel. It is important to design and synthetize biocompatible, multifunctional aldehyde crosslinker and improve mechanical property, self-healing ability and stimuli-responsiveness of CSB hydrogel.

Abstract:Prepare nano-ZnO by hydrothermal method, doped into starch substrate by melt blending method, obtain nano-ZnO starch composite material, study the composition of composite material, microscopic morphology, molecular structure, photoelectric characteristics and corresponding law of action, and initially explore composite materials Inhibit the effect of E. coli. The results show that the nano-ZnO powder has uniform morphology, high crystallinity, and an average particle size of about 85nm. KH560 grafted modified nano-ZnO with a grafting rate of 5.26% to 5.86%. The modified nano-ZnO is further bonded to the starch substrate, and the composite material basically maintains the crystal structure. The modification of the nano-ZnO by KH560 improves the dispersion and stability of the doped material in the starch substrate. With the increase of the content of nano-ZnO, the photoluminescence intensity, ultraviolet shielding performance and ability of inhibiting Escherichia coli of the composite material increase, but the light transmittance shows a downward trend. When the nano-ZnO doping amount is 10%, the antibacterial rate of the composite material to E. coli is about 95%.

Abstract:The biocompatibility of nanomaterials is closely related to their morphologies, defects, surface properties and impurities. In this manuscript, hydrochloric acid and nitric acid solution were adopted to purify and oxidize boron nitride nanotubes (BNNTs). The as prepared hydroxylated BNNTs (BNNTs-OH) were characterized by XPS, FTIR, TG, TEM, Zeta Potential and Photoluminescence. Results showed that BNNTs were successfully oxidized and hydroxylation occurred at the B site. BNNTs-OH had good dispersibility in aqueous solution, and the average hydration substitution was about 1246.7nm. The special fluorescence characteristics could realize the location of BNNTs inside the cells under a certain excitation wavelength. Cytotoxicity tests showed that BNNTs-OH had no cytotoxicity on L02 cells, a human embryonic liver cell line, demonstrating that BNNTs could be a kind of biocompatible nanomaterial and had promising applications in biomedical field.

Abstract:The formation and accumulation of ice on solid surface cause a series of safety problems and great economic losses. Therefore, anti-icing is significant for reducing ice disasters and economic losses. Herein, a carbon black/PDMS superhydrophobic coating with anti-icing performance was prepared by spraying the substrate with a mixture of carbon black nanoparticles, polydimethylsilane (PDMS) and 1H, 1H, 2H, 2H-Perfluorodecyltriethoxysilane (PFDTES). Carbon black gives the coating micro-nano roughness. PDMS acts as an adhesive to increase the fastness of the coating. PFDTES imparts lower surface energy. The coating has excellent superhydrophobic property, which makes the time of water droplets freezing on the surface delay to 160 s, which is more than 5 times that of ordinary glass. Meanwhile, the adhesion of ice is also greatly reduced. In addition, the coating has excellent self-cleaning property and acid, alkali, salt resistance, ultraviolet radiation stability.

Abstract:In order to obtain durable superhydrophobic materials, a wear-resistant superhydrophobic film was prepared by embedding hydrophobic nano-alumina oxide in poly(vinylidene fluoride co-hexafluoropropylene) via a phase separation technology. The chemical compositions, morphology and hydrophobic properties of the film were characterized by SEM，EDS and Contact angle measuring instrument. The results showed that the prepared film composed of a self-similar micro-nano microstructure. And it has excellent self-cleaning and abrasion resistance. The film maintained superhydrophobic after 360 cycles of sandpaper abrasion under 100 g of loading, indicating an excellent mechanical durability. In addition, the film has excellent chemical resistance and UV tability. The simple preparation and high superhydrophobic stability make it suitable for the industrial production and commercialization of superhydrophobic materials.

Abstract:The reduced-graphene oxide aerogel was prepared by the colloidal agglomeration method. Using graphene oxide (GO) as the raw material, the reduced graphene oxide aerogel/eicosane composite phase change material was obtained through self-diffusion eicosane (Eicosane). Finally, the relationship between composite materials and performance was explored. Thermogravimetric (TGA) and differential calorimetry scanners (DSC) were used to test the thermal properties of eicosane and composite materials, the relationship between the mass fraction of eicosane and the enthalpy of the composite material was confirmed, and the influence of the phase change cycle on the materials stability was further explored. The results showed that the enthalpy of the composite was directly proportional to the mass fraction of eicosane. After 50 phase change cycles, PCM4 remains stable. The thermal conductivity analysis displayed that reduced graphene oxide aerogel could improve the thermal conductivity of the eicosane. In addition, through the sunlight simulation test, it is calculated that the light-to-thermal conversion efficiency of the composite material is about 55%.

Abstract:Herein, the water-soluble C60-COOH derivative was first obtained through Bingel cycloaddition reaction of C60, and then the MnO2 nanoparticles were loaded on it by hydrothermal reaction. Finally, the tumor targeting molecule folic acid was conjugated with the aminated polyethylene glycol to synthesize the multifunctional nanocomposite C60-Mn-PEG-FA. Its structural composition and good water dispersibility was confirmed by FTIR，UV-Vis, XPS and DLS. In vitro experiments, the results demonstrated that C60-Mn-PEG-FA could not only achieve magnetic resonance imaging (MRI) at low pH, but also improve hypoxia. At a low concentration of 40 ?g/mL and exposed to natural light of 100 mW/cm2 for 5 minutes, it could target and kill 82% tumor cells without damage to normal cells, providing a strategy for the design of novel theranostic agents.

Abstract:Bacterial cellulose (BC) was produced by fermentation of Komagataeibacter xylinus. The BC membrane was characterized by infrared spectroscopy, X-ray diffraction analysis and scanning electron microscopy. The performance of BC film as substrate for mask was evaluated comprehensively. The results show that the BC membrane has a hree-dimensional network structure with an average diameter of less than 100 nm and a crystallinity of 83.46%, which belongs to typical type I cellulose. Compared with non-woven fabrics and silk mask, BC membrane has superior water holding performance, water vapor transmission performance (2263.54 g/m2?24h) and mechanical properties. The absorption of Vc entrapped in Pickering emulsion (42.36 ?g/cm2) by BC membrane was about 2.21 times that of non-woven mask (19.13 ?g/cm2), 1.54 times that of Silk Mask (27.36 ?g/cm2) within 24 h. And 10.96 ?g/cm2 of nutrients could be transported to the skin within 90 min, which is about 1.8 times that of non-woven fabric (6.08 ?g/cm2), and twice that of silk (5.35 ?g/cm2).

Abstract:The layered organic montmorillonite (OMMT) was first exfoliated into nanosheets by hydroxyl-terminated polybutadiene (HTPB). The OMMT nanosheets with HTPB were then assembled into environment-friendly waterborne polyurethane (OWPU) emulsion and film by in situ polymerization with monomers such as isophorone diisocyanate (IPDI) and dimethylolpropionic acid (DMPA) and so on. Small-angle XRD and TEM examinations indicated that the OMMT nanosheets had uniform contrast and good integrity. DLS, EDS, TGA, LOI, and CONE examinations suggested that the emulsion particle size, elastic modulus, thermal stability, droplet resistance and flame retardant properties of OWPU had been significantly improved. Particularly, the elastic modulus of OWPU nanofilm was increased by a maximum of 59.4% and a peak heat release rate of OWPU nanofilm was decreased by a maximum of 36.9 %. In addition, the surface morphology of the burning char residue showed that the tile-shaped OMMT interpenetrates to form a covering layer with a cluster structure.

Abstract:In order to improve the inkjet printing performance of linen fabric, sodium dodecylsulfate (SDS) and sodium alginate (SA) were synergistically used in the pretreatment process of linen fabrics. The spreading area of ink droplets on the fabric surface and the color parameters of inkjet printing color block were tested. Using contact angle measuring instrument, scanning electron microscope (SEM), solid surface zeta potential, X-ray photoelectron spectrometer (XPS) and Fourier transform infrared spectrometer (FTIR) to analyze the surface physical and chemical properties of linen fabric before and after pretreated. The results show that the degree of ink drop penetration on the surface of the fabric was significantly reduced when the SDS added, and the spreading area of magenta ink drops was decreased by 14%, compared with SA pretreated. The color effect of cyan and black blocks was slightly increased. The rubbing fastness of the printed fabric slightly reduced, the breaking strength and sunlight fastness has not affected. After pretreated, it can be clearly seen from the SEM image that the SDS+SA pretreatment agent formed a film on the surface of the fabric, and the serrated membrane structure between the fibers blocks the pores, prompting more reactive dyes covalently bond with fibers at the dropping position, in addition, the hydrophilicity of the fabric after pretreatment treatment was increased, which is beneficial to the dye uptake of linen fibers.

Abstract:Explore the synergistic antioxidant capacity of Lingonberries anthocyanin and Lonicera japonica polyphenols. Determination of single component and compound (respectively compounded with Lingonberries anthocyanin and Lonicera japonica polyphenol mass ratio 5:1, 2:1, 1:1, 1:2, 1:5) on DPPH free radical, ABTS free radical, hydroxyl radicals, superoxide anion scavenging ability, copper ion reducing ability and total reduction reaction, calculate the combination index CI, and analyze whether the compound in each proportion has a synergistic antioxidant effect. The results showed that, except the compound (1:5) showed antagonistic effect on scavenging DPPH free radical, the other proportion compound showed synergistic effect in each index. Among them, when the DPPH radical scavenging rate and copper ion reduction capacity of the complex (2:1) reached 50%, CIDPPH=0.59±0.07 and CI copper ion =0.35±0.03, indicating that the complex with mass ratio of 2:1 had a synergistic effect on the scavenging of free radicals and a synergistic antioxidant effect. When the effect of complex (1:1) on ABTS free radical and total reduction was 50%, CIABTS=0.58±0.04, and CI total reduction force =0.33±0.04, indicating that the antioxidant capacity was significantly improved after 1:1 combination. The experiment proved that the combination of Lingonberries anthocyanin and Lonicera japonica polyphenols have synergistic effect on the free radical scavenging and metal ion reduction ability. The results of the study show that the combination of Lingonberry anthocyanin and Lonicera japonica polyphenol has a strong antioxidant synergistic effect, which can balance the cold of honeysuckle, relieve the current situation of large amount of honeysuckle and short supply. It provides a theoretical basis for the utilization and development of natural green and safe antioxidant health products.

Abstract:Non-extractable polyphenol (NEPP) was extracted from the residue of post-citrus polyphenols by high intensity pulsed electric field (PEF). On the basis of single-factor experimental investigation (field intensity, pulse number and liquid to solid ratio, etc.), MTT assay, neutral red colorimetric assay, and Griess assay were used to evaluate the effects of NEPP on the growth, phagocytic activity, and NO release of RAW 264.7 cells. The results showed that the obtained process regression model of kumquat NEPP was significant with great fitting, which predicted the maximum theoretical value of kumquat NEPP content was 1.756 mg/g DW. The optimized NEPP extraction condition of kumquat by PEF was shown as follows: pulse number 450 times, field intensity 11.86 kV/cm, liquid to solid ratio V (water): M (fruit residue) = 0.341 mL: 1mg. Following the optimized extraction method, the NEPP content of kumquat (1.5 mg/g DW) was close to the predicted value, indicating that the optimized PEF process was acceptable to the extraction of kumquat NEPP. Kumquat NEPP (100 g/mL) showed no toxicity to RAW 264.7 macrophages, increased NO secretion and boomed phagocytic activity.

Abstract:Four imidazole ionic liquids with different anions were synthesized by a two-step method, and their structure and acidity were characterized by FT-IR, 1H NMR, 13C NMR, TG, Hammett acidity function. Using α-pinene esterification-saponification reaction as a probe reaction, the selectivity of four ionic liquids to n-borneol was investigated. The result shows that the anion is [HSO4]-the best selectivity for borneol, which is consistent with the result calculated by Hammett's acidity function. [Bmim-SO3H]HSO4 for further process research, and the optimized process conditions are: ionic liquid is 8% of the mass of turpentine, n(turpentine):n(acetic acid)=1:3, reaction temperature is 120℃, reaction time is 8h, and the amount of cyclohexane is 35ml. Under these conditions, the conversion rate of α-pinene was 100%, and the selectivity of n-borneol was 39.83%, accounting for 92.58% of the total borneol. Among them, the role of ionic liquid is to provide H to protonate α-pinene to form carbanion, HSO4- stabilizes non-classical carbanion, and forms a complex with acetate, making the reaction to generate borneol more easily. [Bmim-SO3H]HSO4 has high activity after repeated use for three times, the conversion rate of α-pinene is still 99.76%, and the selectivity of borneol is 35.45%.

Abstract:In view of the problems of long time and low purity of ellagic acid in the actual production process, ellagic acid was prepared using tannic acid as the matrix by a new high-throughput interface oxidation method. The effects of metal ions, tannic acid concentration, temperature and time on the yield and purity of ellagic acid. The influence of solvent method, crystallization method, alkali-soluble acid precipitation method and on the purity of ellagic acid was further explored. The samples were characterized by high performance liquid chromatography, infrared spectroscopy, ultraviolet-visible spectroscopy and thermogravimetry Characterize. The results show that the better process conditions for its preparation are: 2.5% tannic acid solution with metal ion Na (NaOH) to adjust the pH of the reaction solution to 8.5, reaction temperature 20 ℃, reaction time 6h, ellagic acid prepared under this condition After alkali-soluble acid precipitation, the yield is 46.72% and the purity is 84.55%; the methanol solvent washing method was used for 1h at 65℃, the purity of ellagic acid reached 98.13%, and the recovery rate was 75.03%, the thermal stability of ellagic acid was improved. The combination of liquid-gas jet oxidation method and solvent washing method greatly shortens the reaction time for preparing ellagic acid and significantly improves its purity. It is expected to increase the output rate of ellagic acid in industrial production and broaden its application in the fields of medicine and cosmetics.

Abstract:CuO-SiO2 composite aerogels were prepared by sol method. TiO2 nanofibers with diameter of ~16 nm were successfully prepared by vapor-phase growth using CuO-SiO2 composite aerogels to fill TiCl4.The structure and photoelectric properties of the materials were characterized by XPS, UPS, UV-Vis DRS, PL and etc. Compared with the commercial TiO2 nanoparticles (P25), the prepared CuO-SiO2@TiO2 nanofibers show much lower fluorescence intensity and slower recombination rate of photogenerated election-hole pairs. Loading of CuO onto the nanofibers, the fluorescence intensity of the CuO-SiO2@TiO2 /CuO was further reduced, and the absorption of visible light was enhanced. The photocatalytic reduction of CO2 was carried out in the absence of sacrificial agent using a 300W xenon lamp as light source. The CuO-SiO2@TiO2 and CuO-SiO2@TiO2/CuO were used as photocatalysts, the methanol yield was1304.0 and 1589.0μmol/g-cat, respectively. TOF was 0.038and 0.046/h correspondingly. The cyclic experiments showed that the nanofibers had good photocatalytic stability. After 5 cycles, the retention rate of CuO-SiO2@TiO2/CuO was 94%, and the yield of methanol was 1472.0 μ mol/g-cat, TOF was 0.042/h.

Abstract:Cu-ZnO catalysts with different Cu-Zn molar ratios (n=1/4, 3/7, 2/3, 1 and 3/2, corresponding to copper mole fraction of 0.2, 0.3, 0.4, 0.5 and 0.6) were prepared by hydrothermal method using zinc nitrate hexahydrate, copper nitrate trihydrate and urea. The structure of Cu-ZnO catalysts was characterized by SEM, XRD, H2-TPR and BET. The effects of copper mole fraction on the morphology of catalyst and the hydrogenation of ethyl acetate were studied. The results show that the Cu-ZnO catalysts prepared by hydrothermal method are all self-assembled nanoflower structures. When the copper mole fraction is 0.4, the thickness of the nanosheet is less than 50 nm, the diameter of the nanoflower is about 10μm, and the conversion rate of ethyl acetate is the highest. When the mole fraction of copper is too high or too low, the activity decreases. It was found that the binding strength of Cu and ZnO was moderate and the active sites were well dispersed in the catalyst with copper mole fraction of 0.4. The effects of hydrothermal conditions on the catalytic performance were investigated. The conversion of ethyl acetate reached 94% under the optimal hydrothermal conditions〔hydrogenation reaction conditions: 220℃, 3Mpa, mass ratio of hydrogen to ethyl acetate: 20, space-time velocity of liquid: 2.0g ester (g catalyst•h)〕. The conversion of ethyl acetate remained above 92% in the stability test of catalyst (300h).

Abstract:Epigallocatechin gallate (EGCG) was successfully grafted onto the carboxyl group of carboxymethyl yeast (1,3/1,6)-β-D-glucan (CMG) by chemical coupling method of 1-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC)/4-dimethylaminopyridine (DMAP). The structure and thermal stability of carboxymethyl yeast (1,3/1,6)-β-D-glucan-EGCG (CMG-EGCG) were characterized by FTIR, UV-Vis spectra and TGA. The antioxidant activity of CMG-EGCG was evaluated. The EGCG content of CMG-EGCG measured by folin-Ciocalteu method was 28.90 mg/g. The results showed that compared with CMG, CMG-EGCG had better thermal stability and antioxidant activity. When mass concentration was 1.0×10-3 mg/L, CMG-EGCG showed 78.85% of inhibition of DPPH free radical, 93.00% of inhibition of ABTS free radical, and its reducing capacity was 1.15. Those results show that CMG-EGCG can be used in cosmetics raw materials and food industry.

Abstract:The CoS2/AOCF composites was prepared by the method of coordination loading with CoSO4, Na2S2O3, S and AOCF as raw materials. By making the lone pair electrons O, N of —OH and —NH2 groups on amidoximated polyacrylonitrile polymer chain in coordination with Co(Ⅱ), the specific surface area of the active component CoS2 was greatly improved and the crystal structure of the active component was changed, increasing the number of active sites. The phase analysis and morphological characterization of the CoS2/AOCF composites were carried out by means of SEM, XRD, TEM, XPS and BET. Then the CoS2/AOCF composites were tested for electrocatalytic hydrogen evolution performance. The growth mechanism of "dissolution-coordination-recrystallization" of the composite surface morphology was proposed. The results show that cobalt ion have empty d orbitals and free d electrons, which can easily accept the electron pair of ligands, and the d electrons are fed back to the ligands, which greatly increases the stability of the compound. When the CoS2/AOCF composites are directly used as a binder-free electrocatalyst coating, the design of coordination covalent bond makes the bonding between the active components of electrocatalyst layer and the glassy carbon substrate stronger. On the one hand, it not only avoids the degradation of catalytic performance caused by using binders, but also improves the dispersity of CoS2 particles. On the other hand, CoS2/AOCF composites can expose more active sites, which is beneficial to the release of hydrogen on the electrode surface. The overpotential of CoS2/AOCF is 92 mV at a current density of 10 mA/cm2, and the Tafel slope is only 43 mV/dec. It has good hydrogen evolution stability and exhibits excellent electrochemical performance. This simple and low-cost post-synthesis strategy can be extended to the preparation of various functional electrocatalysts. The present work is expected to contribute to the practical application of sulfide electrocatalysts.

Abstract:A heterogeneous Fenton catalyst was prepared for the removal of organic pollutants from dye wastewater by using reductive organic acids coupled with iron ions supported activated carbon fiber. The in-situ reduction of Fe3+ to Fe2+ was promoted by the strong reducibility of reducing organic acids. The organic pollutants can be effectively enriched and degraded due to the high adsorption and good conductivity of activated carbon fiber. SEM, FT-IR and ICP-AES were used to characterize the prepared ferric oxalate supported activated carbon fiber (Oxa-Fe/ACFs-3). It was proved that the ferric oxalate complex was uniformly loaded on the activated carbon fiber, and the mass fraction of iron was 0.96%. The degradation of dye wastewater by activating H2O2 with Oxa-Fe/ACFs-3 showed that the chemical oxygen demand (COD) removal of wastewater can achieve 62.2% within 100 min at 50 ℃. In addition, the suitable pH range and reusability of the catalyst were investigated. Electron paramagnetic resonance (EPR) experiments showed that Oxa-Fe/ACFs-3 promoted the activation of H2O2 to generate active radicals •OH and O2•-, which realized the degradation of organic compounds in dye wastewater. By comparing the performance of different reducing organic acids complexed with ferric supported activated carbon fiber in the treatment of dye wastewater, the enhancement of reducibility of organic acids is beneficial for the removal of COD in dye wastewater.

Abstract:Using yeasts as biological templates, flower-like g-C3N4/Bi2MoO6 microspheres were prepared via hydrothermal-template sacrifices method. The crystal phase, microstructure, light absorption and specific surface area of the as-prepared sample was characterized with various techniques including XRD, SEM, TEM, FT-IR, DRS, photocurrent response and nitrogen adsorption-desorption. We also examined the visible-light driven photocatalytic performance of g-C3N4/Bi2MoO6 composite microspheres for methylene blue (MB) simulated dye wastewater. The experimental results showed that g-C3N4/Bi2MoO6 composite was successfully synthesized on the surface of yeast templates through hydrothermal-template sacrifices method, and the as-obtained microspheres with diameter at about 8 microns were of good dispersity. The surface of the g-C3N4/Bi2MoO6 microspheres were composed of flower-like nano-clusters, and the specific surface area of composite sample reached 11.6007 m2/g. The results of photocatalytic experiments verified remarkable visible-light driven photocatalytic performance of flower-like g-C3N4/Bi2MoO6 microspheres for methylene blue simulated dye wastewater. The degradation efficiency for the MB simulated dye wastewater at initial concentration of 15 mg/L was beyond 96%, when the as-prepared photocatalyst was added at dosage of 1 g/L and the mixture was irradiated under visible light for 120 min. Mechanism analysis demonstrated that the formation of Z-type heterojunction between g-C3N4 and Bi2MoO6 on the flower-like surface of bio-templated microspheres reduced the recombination rate of electronic-hole remarkably and enhanced the visible-light driven photocatalytic efficiency for simulated dye wastewater significantly.

Abstract:Shell powder loaded with nano-zero valent iron (MS-NZVI/SP) was prepared by mangosteen shell extract and shell powder and was used to investigate the Fenton-like degradation effect of eriochrome black T. The prepared samples were characterized by SEM, XRD and FTIR. The results showed that MS-NZVI/SP was successfully prepared and displayed uniform spherical particles. The surface of MS-NZVI/SP was covered with organic polyphenols. Furthermore, it had good stability and reusability. The degradation performance of eriochrome black T on MS-NZVI/SP was optimized by single factor experiments. The optimized conditions were as follows: loading mass ratio of shell powder to nano zero-valent iron of 1∶1, temperature of 35 ℃, pH of solution of 3, hydrogen peroxide dosage of 4 mL, synthetic material of 100 mg. Under these conditions, the degradation efficiency of eriochrome black T could reach 93.01%. The degradation process of eriochrome black T conformed to the quasi-secondary kinetic model.

Abstract:In order to fabricate leather finishing materials with enhanced flame retardant effect, GO was prepared using natural graphite as raw material by modified Hummers method, and then it was reduced by NaBH4. The as-obtained graphene was characterized by FTIR, XRD and TEM, which show that graphene has been successfully prepared. Then, physical blending method was used to introduce graphene into natural protein casein system to prepare casein-based composite emulsion applied as leather finishes. The flame-retardant property, mechanical property, as well as dry and wet rubbing resistance of the finished leather samples were tested. The results show that when the rGO content was 0.5% of the solute quality of the casein system, compared with the casein system without rGO, the combustion rate of the leather samples decreased by 47.2%, the limit oxygen index (LOI) increased from 24.2% to 26.3, the heat release rate (HRR) decreased by 53.1%, and the total heat release rate (THR) also decreased. At the same time, the introduction of graphene has little effect on the mechanical properties, as well as dry and wet rubbing resistance of finished leather samples.

Abstract:Using acrylic acid (AA) and self-made nonylphenol polyether acrylate(NPEAA) as raw materials, under the conditions of azobisisobutyronitrile (AIBN) as initiator and toluene as solvent, a binary copolymer heavy oil demulsifier was prepared by initiating polymerization. The structure of the product was confirmed by FTIR and 1HNMR, and the molecular weight was tested by GPC. The critical micelle concentration CMC is 0.5g/L and the the surface tension is 25.684 mN/m measured by fluorescence spectrophotometer and surface tensiometer. Taking the dehydration rate and oil content of the dewatered sewage as measurement indicators, the demulsification performance of polymer demulsifier on Chenzhuang heavy oil W/O emulsion was discussed under different factors, and the optimal demulsification conditions are determined: when the temperature is 55?C, time is 2h, dosage is 0.5g/L, the dehydration rate is 88.5%, and the oil content in the dewatered water is 198.4 mg/L. The effects of polymer demulsifier on viscosity, system stability, oil-water interface and micro demulsification process of emulsion system were studied. It was found that polymer demulsifier is easier to wet and diffuse at oil-water interface, with fast dehydration rate and good demulsification effect.

Abstract:Using isophorone diisocyanate (IPDI) and polytetrahydrofuran ether glycol (PTMG/2000) as the main raw materials, dibutyltin dilaurate (DBTDL), 1,4-butanediol (BDO) and 2,2-di hydroxymethyl-propionic acid (DMPA) as catalyst, small molecule chain extender and hydrophilic monomer to prepare a waterborne polyurethane prepolymer (PPU). Hyperbranched poly(amine-ester) (HPAE) synthesized from methyl acrylate (MA), diethanolamine (DEA) and trimethylolpropane (TMP) as a crosslinking agent. Branched waterborne polyurethane adhesives with different HPAE content are prepared. FT-IR spectroscopy and 1H-NMR spectroscopy were used to characterize the structure of HPAE and HPAE-WPU; TGA and multifunctional material testing machine were used to investigate the thermodynamic and mechanical properties of the film. The results show that when the amount of HPAE is 1%, the comprehensive performance of HPAE-WPU emulsion and film is better. The solid content of the emulsion is 33.67%, the water absorption rate of the film is 11.22%, and the water contact angle is 90.32°; the mechanical properties of the film are better, its tensile strength is 10.33 MPa, and its elongation at break is 533.73%; the modified polyurethane has good bonding properties, and its peel strength is 4.063 N/mm.

Abstract:Different synthesis systems of 2,6-Dimethyl-4-(3-nitrophenyl)pyridine-3,5-dicarboxylate 3-(2-methoxy)ethyl 5-(3-phenyl)-2(E) –Acrylic (named as Cilnidipine impurityⅠ) were studied. A one-step aromatization reaction for the preparation of Cilnidipine impurityⅠby using Cilnidipine as the starting material and active MnO2 as the oxidant was reported. The reaction conditions were optimized and the optimal conditions were obtained as follows: m(Cilnidipine) ∶m(MnO2) = 1.00∶1.22, toluene as solvent , reaction temperature at 105 ℃ and reaction time 1 h.. Under the above-mentioned conditions, the product with a yield of 92.0% and a purity of 99.2% (normalization method) was obtained. The structure of product was confirmed by 1HNMR, 13CNMR, HRMS, FTIR. This reaction achieved green, efficient and direct transformation from Cilnidipine to Cilnidipine impurityⅠ.

Abstract:Acetoxime was synthesized by one-step oxidation in a continuous flow micro-channel reactor with special micro-structure, using acetone, ammonia and hydrogen peroxide as raw materials, titanium silicalite（TS-1） over catalyst and tertbutanol as solvent. The effects of concentration of hydrogen peroxide, ammonia, hydrogen peroxide, solvent, co-catalyst and temperature on ammoximation were investigated. The results showed that under conditions of outlet pressure of AFR micro-channel reactor system was 5 bar, temperature at 100 ℃, and catalyst concentration was 8 g/mol(acetone unit), molar ratio of ammonia/H2O2/tertbutanol/ acetone=3:1.1:6:1, concentration of H2O2 and ammonia were 70 and 25 wt% respectively, concentration of co-catalyst was 3 mg/mol(acetone unit), residence time was 72 s, conversion of acetone reached 80%, selectivity of acetoxime reached 97%, and yield of acetoxime reached 77%. AFR micro-channel reaction system had significant advantages, including small liquid holding capacity, short residence time, strong mass transfer and heat transfer, which strengthened coordination effect between reaction material and catalytic system, reaction rate of ammoximation was also increased considerably, essence safety of acetone ammoximation caused by decomposition of hydrogen peroxide was solved effectively, and green, safe and efficient of acetone ammoximation was realized.