Abstract:Using Cu(NO3)2•3H2O and Fe(NO3)3•9H2O as raw materials, spinel nano-copper ferrite(CuFe2O4) was prepared by the sol-gel-self-propagating combustion method with the aid of citric acid, and the material was characterized by SEM, EDX, XRD and VSM.The CuFe2O4/persulfate (PDS) system was used to catalytic oxidation treatment of azo dye reactive black 5 (RB5). With the aim to study the effects on catalytic system by the CuFe2O4 dosage, initial PDS concentration, reaction temperature, initial pH, common inorganic anions and humic acid. The results show that the catalytic performance of c-CuFe2O4 prepared by calcination at 300℃ is at the best level. When the temperature at 25℃, the initial concentration of RB5 is 100 mg/L, the dosage of CuFe2O4-300 1 g/L, the initial PDS concentration 8 mmol（1.9 g）/L, and the incipient pH 9.00, the removal rate of RB5 can reach 92.9%. the degradation process follows a quasi-first-order kinetic model. Quenching experiments found that the catalytic sites are on the surface of the material and the pores. The reaction depends on the bivalent/trivalent copper cycle on the surface of the material and the homogeneous catalysis of free Cu2+. SO4-•and •OH are the main active products. CuFe2O4 is super paramagnetic and can be recycled through magnetic separation. After 5 cycles of experiment, it can maintain a removal rate of more than 80%.

Abstract:Graphene aerogels (RGA) were prepared by ice template and two-step hydrothermal reduction through atmospheric drying. The microstructure of RGA was observed by SEM, and the reduction of graphene oxide (GO) was analyzed by XRD, XPS, FTIR and Raman. The electronic universal testing machine was used to carry out the compression spring back experiment on RGA, and the results showed that RGA had excellent compression spring back energy (under 50% strain, after 200 times of compression spring back, RGA could still bounce back to the original height quickly, without significant changes in shape and height). The adsorption performance test of simulated oily waste water showed that RGA tended to adsorption equilibrium after 210 minutes of adsorption, and the adsorption capacity of RGA to emulsified oil in water reached 1466.325 mg·g-1. The adsorption kinetic model of RGA on oily waste water conforms to the quasi-second-order kinetic model. The internal diffusion model showed that the adsorption of oily waste water by RGA was divided into three stages: macropore diffusion on the surface of RGA, mesopore diffusion and micropore diffusion. The cyclic adsorption results showed that RGA had excellent cyclic adsorption performance on oily waste water (the adsorption capacity of the cyclic adsorption of 15 times was kept between 1400 and 1450 mg·g-1). The adsorption results of the actual sewage show that the removal rate of the actual sewage by RGA can reach more than 90%, and can be recycled.

Abstract:Chitosan is widely used in agriculture, chemical industry, medicine, environmental protection and other fields because of its wide sources, natural non-toxic, rich functional groups and strong chemical activity. In this paper, the research work and progress of chitosan and its derivatives in the removal of metal ions in solution were reviewed, focusing on the chelating ability of active groups on chitosan molecular chain to metal ions. The chemical modification methods of functional group replacement and recombination of chitosan monomer and physical modification method of changing the physical morphology of chitosan were introduced. The basic principles, application effects, advantages and disadvantages of crosslinking modification, grafting modification, magnetization modification and molecular imprinting were elaborated in detail. The preparation methods and material properties of chitosan microspheres and chitosan membrane were also introduced. In view of the problems in the preparation and application of chitosan and its derivatives, the research direction of efficient and selective removal of metal ions by flocculation chelation mechanism was proposed.

Abstract:The preparation process of Sacubitril was industrially improved. The commercial product N-[(1R)-2-[1,1'-biphenyl]-4-yl-1-(hydroxymethyl)ethyl]carbamic acid 1,1-dimethylethyl ester (compound Ⅰ, CAS:1426129-50-1) was used as starting material. The intermediate V was obtained by TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl) oxidation, Wittig reaction, deethyl ester and recrystallization. The key intermediate Ⅵ was obtained by recrystallization with m(n-heptane)∶m (ethyl acetate) = 1∶1 after hydrogenation reduction of Pd/C. Finally, the target product Sacubitril (compound Ⅷ, CAS: 149709-62-6) was obtained by amidation after protection with ethyl ester. The key hydrogenation step was selected in detail in terms of reaction parameters such as solvents, additives, catalysts, temperature, pressure, time, and recrystallization solvents. A process route suitable for industrial production was determined, and three batches of kilogram scale in succession were carried out. The chiral structure of the key intermediate Ⅵ was analyzed by chiral HPLC, and the chiral purity was 99.98%. The total yield of the target product was about 50%, and the purity of the product was 100% by HPLC detection.

Abstract:A series of PdZnx/Al2O3 bimetallic catalysts with different Pd:Zn molar ratios were prepared in a controlled manner by strong electrostatic adsorption for the selective hydrogenation of 1,4-butynediol (BYD), and the effect of Zn introduction on the catalytic hydrogenation was investigated. It was found that the addition of a small amount of Zn was able to maintain the catalyst at a high activity and substantially improve its selectivity for the intermediate cis-1,4-butenediol (cis-BED). The PdZn2/Al2O3 catalyst exhibited high catalytic activity with 89% conversion and selectivity for cis-BED (85%) at 50 °C, 1 MPa H2 pressure, and the contact time of 6 gcat.·h/mol. Combined with temperature-programmed reduction and X-ray photoelectron spectroscopy, it was found that the precursor was calcined at 400 ℃ and reduced at 400 ℃ to form the PdZn bimetallic catalyst. The doping of Zn atoms effectively modulated the geometrical and electronic effects of the Pd active sites, which effectively inhibited the over-hydrogenation of the intermediate products.

Abstract:Polyglycerol-10(PG) was used as stabilizer to simultaneously ex-foliate and functionalize hexagonal boron nitride (h-BN) under ultrasonic condition. The h-BN nanowires functionalized by PG (GB) were characterized by FT-IR, TG, AFM and TEM. The prepared GB was used as the anticorrosive filler of waterborne polyurethane (WPU) coating, and the composite coatings with different amount of GB(0，0.5%，1.0%，2.0%) were prepared. The water contact Angle, water absorption, adhesion loss, thermal and mechanical properties of different coatings were investigated. Finally, the corrosion behaviors of WPU and PU/GB composite coatings in 3.5%NaCl aqueous solution were evaluated by electrochemical workstation. The results show that GB nanoparticles can significantly enhance the water resistance, thermal stability, mechanical properties and corrosion resistance of WPU coatings.

Abstract:The selenium polysaccharide was prepared by chemical synthesis methods taking Jiyuan rubescens polysaccharides as raw materials. The structural characteristics of polysaccharides and selenium polysaccharides were analyzed by UV, FT-IR, SEM, TGA, and HPLC.The antioxidant capacity of rubescens polysaccharides and selenium polysaccharides were evaluated by four methods including DPPH (1,1-diphenyl-2-trinitrophenylhydrazine) radical method and hydroxyl radical method. Results:The mass fraction of selenium in selenium polysaccharide was 1.35 mg/g. After the selenization modification, the basic skeleton of rubescens polysaccharides was retained, and the types of monosaccharides remain unchanged, but its stability and decomposition temperature were decreased, and the morphology of polysaccharides also changes significantly. The spherical and strip morphology increased, and the flake morphology decreased.In addition, in the in vitro antioxidation experiment,when the mass concentration of selenium polysaccharide was 1.6mg/mL, the scavenging rates of DPPH radicals, ABTS radicals, and OH radicals were 68.68%, 86.69%, and 45.12%, respectively, which were all stronger than Rubescens polysaccharides.

Abstract:Corrosion has become one of the main culprits that harm the world economy and constitute a major accident, so how to solve the problem of corrosion is the difficulty we must overcome at present. As a kind of anti-corrosion material, waterborne polyurethane coating is non-toxic, tasteless, safe and environmentally friendly, but the anti-corrosion performance still needs to be improved. In order to further improve the anti-corrosion performance of products, researchers use different modification methods to prepare waterborne polyurethane anti-corrosion coatings with different functions. This paper mainly introduces the modification of Waterborne Polyurethane Coatings by several commonly used modification methods such as nano materials and self-healing, and prospects the future research direction and development trend.

Abstract:Octadecyltrimethoxysilane (OTMS) was introduced to hydrophobically modify the surface of nano-silica, then the modified lipophilic silica was added into the silicone resin (SI) as a superhydrophobic modifier. Subsequently, SI/OTMS-SiO2 functional composite coating was constructed with the polyethylene (PE) as a substrate utilizing a two-step cure method. The accurate chemical structure of the modified nano-silica and the composite coating were determined by means of the chemical structure characterization, resulting that OTMS was successfully integrated onto SiO2 and OTMS-SiO2 uniformly loaded onto the silicone surface, as well as the composite coating was obtained. Then, the effects of the introduction of modified SiO2 on the surface roughness of the composite coating were characterized by SEM and AFM, and the mechanism of constructing a superhydrophobic coating was invested. On this basis, the effects of the modified SiO2 structure on the superhydrophobic properties, wear resistance, thermal stability and other properties of PE films coated with SI/OTMS-SiO2 superhydrophobic coating were systematically investigated, and the microscopic morphology of the composite coating surface and its hydrophobic properties were studied.

Abstract:The cycloaddition reaction of CO2 and epoxy compounds is used to prepare cyclic carbonic acid. It has the characteristics of 100% atom economy and environmental friendliness, which is beneficial to alleviate the \"greenhouse effect\" . It has important theoretical and practical significance. The development of a novel and efficient catalytic system is the key to making this reaction proceed smoothly and quickly. In recent years, the metal complex catalyst system has been used the most in the cycloaddition reaction of epoxides and CO2, and the catalytic effect is the most outstanding. Here, review the research progress in the field of CO2 and epoxide cycloaddition reaction of metal complex catalyst systems such as main group metals, transition metals, lanthanide metals, 3d-4f metal catalysts in recent years. In the future, it will provide an important reference for the synthesis of new and efficient metal complex catalyst systems.

Abstract:The eggshells are modified with magnesium chloride solution to prepare magnesium-loaded eggshells (MgES) and applied to the removal of phosphate in water. The materials were characterized by XRF， SEM， FTIR and XRD. The performance of MgES on the removal of phosphate in water was analyzed by static adsorption tests on adsorption thermodynamics, isotherms, kinetics and initial solution pH. The results show that the Langmuir model can fit the adsorption isotherm well and the maximum adsorption capacity at 25 ℃ is 112.156 mg/g. The adsorption of phosphate by MgES is a spontaneous endothermic process. The adsorption kinetics follows the quasi-second-order kinetics model. Acidic conditions are conducive to its adsorption process. In addition, after 5 regeneration times, the removal rate of phosphate by MgES still is 61.22%. The application of MgES to remove phosphate can realize the recycling and reuse of eggshell waste while reducing the phosphate content in the waste water, which is of practical significance.

Abstract:Plant essential oil/palygorskite composites were fabricated by high pressure homogenization and also modified using hexadecyl trimethylammonium bromide (CTAB), the structure and morphology of CTAB modified plant essential oil/palygorskite antibacterial composites were characterized by FTIR, XRD, SEM, Zeta potential and TG. FTIR results displayed that plant essential oil was loaded on palygorskite, and also successfully modified by CTAB. Zeta potential of the composites ranged from negative to positive with the increasing of CTAB dosage. Minimum inhibitory concentration (MIC) results indicated that antibacterial activities of the composites were enhanced with the increasing of CTAB content, and CTAB is beneficial to enhance the antibacterial activities of the composites. When the content of CTAB was 2.5%, the MIC values of CTAB modified carvacrol/palygorskite composites and cinnamaldehyde/palygorskite composites against S. aureus decreased from 1 g/L to 0.125 g/L and 0.5 g/L, respectively.

Abstract:Boron nitride nanosheets (BNNSs), as a two-dimensional flake nano material, has high thermal conductivity and thermal stability. The thermal conductivity of the composites can be improved by adding boron nitride nanosheets as a filler. Based on the research progress on the thermal conductivity of composites modified with boron nitride nanosheets in recent years, the preparation and modification methods of BNNSs and the establishment of thermal conductivity paths are summarized. Subsequently, the thermal conductivity mechanism of composites was introduced and the affecting factors of the thermal conductivity of the composites were analyzed. Finally, the improvement of thermal conductivity of composites was prospected.

Abstract:Flame-retardant polyester microfiber/water-based polyurethane (PETMF/WPU) composites were prepared by dry solidification, alkali dewatering and post-finishing of sea island fiber nonwoven polyester (PET/COPET) with self-flame retardant water-based polyurethane (WPU) slurry containing impregnated phosphorus. The effects of self-flame retardant WPU slurry with different solid content of phosphorus on the flame retardant properties and mechanical properties of PETMF/WPU composites were analyzed and discussed. The flame retardant properties were characterized by cone calorimeter, limiting oxygen index and vertical combustion. The microstructure was characterized by scanning electron microscope. The thermal stability was characterized by TGA. The results show that when the solid content reaches 35wt%, the LOI value of PETMF/WPU composite reaches 31.7%, and the vertical combustion reaches V-0 grade. The composite can self-extinguishing and has no droplet generation in the combustion process, and its mechanical properties still meet the industry standard. The use of self-flame retardant materials containing phosphorus can reduce the release of harmful gases in the combustion process.

Abstract:By introducing the coumarin with excellent photophysical properties into the backbone of ligand H3L as a fluorescent signal unit, a new metal-organic octahedral cage Zn?L was prepared by coordinating with transition metal ion Zn(Ⅱ) for realizing selective recognition of glucosamine via the host-guest hydrogen bonding interaction. The characterization results of high-resolution mass spectroscopy and ultraviolet-visible spectroscopy show that this metal-organic cage compound has a M6L4 octahedral structure. Twelve coumarin groups are uniformly distributed at the vertical positions of the octahedral cage, which has high stability in solution and possesses a large cavity with the opening windows that allows free ingress and egress of the guest molecules with suitable size. 1H NMR titration shows that glucosamine combine with cage structure through multiple hydrogen bonding. High resolution mass spectrometry test suggests that a stoichiometric ratio of 1:2 host-guest inclusion complex is formed between the metal-organic octahedral cage Zn?L and the glucosamine and fluorescence titration spectra fitting shows an association constant 1.6 ? 108 M–2, confirming the strong complexation between host and guest, which is conducive to the selective recognition of glucosamine by the cage structure. Glucosamine molecule quenches the fluorescence intensity of Zn?L by up to 93%, while other 9 common biological carbohydrate molecules can only quench 5-20%, showing a highly selective fluorescence response of Zn?L to glucosamine molecule

Abstract:Cu-Mn-Al spinel solid solution catalysts were prepared by coprecipitation method using copper nitrate, aluminum nitrate and manganese nitrate, and tested in methanol steam reforming reaction for the preparation of hydrogen. The catalysts were characterized by BET, H2-TPR, XRD, SEM, XPS, etc. The effects of Mn ratio (CuMnxAl4-x , x = 0 ~ 0.5) were investigated on catalyst physicochemical properties, morphology, as well as the catalytic performance. The results showed that the specific surface area, reduction properties and surface chemistry of catalyst samples were altered with Mn ratio. With Mn ratio x rising of from 0 to 0.5 (based on the amount of copper), the specific surface area decreased, the size of spinel particles increased, and became more difficult to reduce. The best performance was found for the catalyst CuMn0.25Al3.75, where under the reaction conditions of 260 ℃, 0.3 MPa, n(H2O)∶n(CH3OH) =1∶1, weight hourly space velocity(WHSV) 3.0g-feed/g-cat/h, the highest methanol conversion attained 91.7% and dropped to 78.7% after 150h running, which are substantially higher than the CuAl spinel catalyst contains no Mn.

Abstract:Nitrogen-bridged covalent triazine polymers NB-CTP-1 and NB-CTP-2 were designed and synthesized from tris(4-cyanamidophenyl)amine and tetrakis(4-cyanamidophenyl)methane to address the issue of trade-off between CO2 adsorption capacity and CO2/N2 adsorption selectivity among the well-established organic polymers. The structure and morphology features of the prepared samples were characterized by means of FTIR, TGA, XRD, SEM, TEM and Automatic physical adsorption analyzer. The NB-CTP materials showed good CO2 capture capacities (3.04 mmol/g for NB-CTP-1, 3.23 mmol/g for NB-CTP-2) under 1.01×105 Pa and 273 K conditions. Notably, based on the reversible adsorption-desorption isotherms at 1.01×105 Pa and 273 K, CO2/N2 selectivities for NB-CTP-1 were obtained as high as 113 (Henry's law) and 143 (IAST), whereas for NB-CTP-2, they were 75 (Henry's law) and 89 (IAST). In addition, the enthalpy of adsorption at zero coverage (Q0) for NB-CTP-1 (35.3 kJ/mol) and NB-CTP-2 (37.6 kJ/mol) were calculated using the Vant Hoff equation based on virial equation, revealing the strong dipole- quadrupole interactions between these materials and CO2, which could enhance the CO2/N2 adsorption selectivity.

Abstract:Taking the conversion rate of sterols as a indicator, the effects of 10 common commercial lipases in catalyzing the synthesis of lignosterol oleate were investigated, and the Candida rugosa lipase was determined as the preferred biocatalyst, and n-hexane was further screened out as the preferred reaction medium. Based on the investigation of the four reaction conditions of lipase dosage, oleic acid-alcohol molar ratio, reaction temperature and reaction time, the process conditions of enzyme-catalyzed lignosterol oleate synthesis were optimized by response surface analysis. The optimized process parameters of Candida rugosa lipase catalyzed synthesis of lignosterol oleate are: CRL addition amount is 10 w% based on the sterols, the molar ratio of substrate acid to alcohol is 3.8:1, the reaction temperature is 46 ℃, the reaction time is 28 h, and the conversion rate of sterol is 91.56%.

Abstract:In this study, a fluorescent chemosensor based on fluoroboron dipyrrole (BODIPY) (Ⅰ) has been synthesized using 8-hydroxyquinoline-5-carbaldehyde and dimethyl pyridine-2, 6-dicarboxylate as raw materials, and the structure was characterized by FT-IR, 1H NMR, 13C NMR and ESI-MS. The sensing performance of sensor Ⅰ was studied by UV-vis/fluorescence spectrophotometry. The results showed that: sensor Ⅰ showed an obviously “on-off” fluorescence response toward Cu2+ in V(DMF)∶V(water)=1∶4 solution, and the quenching efficiency reached a maximum of 97.7 %, and the detection limits of sensor Ⅰ toward Cu2+ was 5.7×10-8 mol/L. Moreover, complex Ⅰ-Cu2+ showed an obviously “off-on” fluorescence response toward PPi, and the detection limits was 1.9×10-8 mol/L. It shows that the sensor Ⅰ has high sensitivity and anti-interference ability in the recognition and detection of Cu2+ and PPi. Through Job's plot and 1HNMR titration data analysis, it is concluded that the binding stoichiometry of sensor Ⅰ toward Cu2+ and complex Ⅰ-Cu2+ toward PPi were 1∶1. The effective determination pH range sensor Ⅰ toward Cu2+ and PPi was from 5 to 9, and the cycle response test could reach more than 4 times.

Abstract:The fluorinated organic solvent 2,2,3,3-tetrafluoropropyl methacrylate (TFPMA) was introduced as a dual-function additive in the carbonate electrolyte system. The effect of TFPMA on increasing the wettability was investigated, and the performance of the lithium metal battery after adding TFPMA was tested by using AC impedance and constant current charging and discharging. SEM and XPS were used to characterize the surface of the lithium metal electrode after cycling. Experiments show that after adding TFPMA with a mass fraction of 1%, the contact angle between the electrolyte and the diaphragm is reduced from 53.5° to 44°, and the internal resistance is reduced from 6.15 Ω to 1.94 Ω. The current density of Li-LiFePO4 battery is at 5 C. The specific capacity is increased from 66 mA·h/g to 80 mA·h/g, and the constant current cycle at 1 C current density can maintain a cycle efficiency of more than 99% after 100 cycles. TFPMA also promotes the uniform deposition of Li+ and the formation of excellent SEI films, and inhibits lithium dendrites. After adding 1% TFPMA, Li-Cu batteries can be cycled for more than 100 cycles without significant drop in coulombic efficiency. The SEM image of the electrode learned that the surface of the lithium metal negative electrode added with 1% TFPMA electrolyte is more smooth and has less lithium dendrites.

Abstract:Uniform and dense zeolitic imidazole framework-8 (ZIF-8) sub-layer was fabricated on the surface of polyvinylidene fluoride (PVDF) membrane via an in-situ contra-diffusion method, and the interfacial polymerization (IP) procedure was further used to prepare polyamide/ZIF-8/PVDF composite nanofiltration (NF) membranes with polyamide (PA) top thin layers and ZIF-8 sub-layers. SEM, XRD, FTIR, AFM, XPS, contact angle analyzer and zeta potential analyzer were utilized to measure the chemical compositions, structures and morphologies of the prepared ZIF-8/PVDF composite membranes and the PA/ZIF-8/PVDF composite NF membranes. The effect of ZIF-8 sub-layer on the structure and performance of these composite NF membranes were investigated systematically. Results indicated that the existence of ZIF-8 sub-layer increased the crosslinking degree of the polyamide and improved the compatibility of polyamide layer and PVDF support membrane. Under the pressure of 0.6 MPa, the composite NF membrane exhibited high flux of 24.05 L/m2?h and good anti-fouling property. Furthermore, the composite NF membranes showed excellent desalination performance, with the rejection ratio of 97.34%, 93.57%, 89.31% and 85.16% for MgSO4, Na2SO4, NaCl and MgCl2, respectively.

Abstract:In this paper, Methacrylic acid(MAA), 2-Acrylamido-2- Methyl Propanesulfonic Acid(AMPS), polyvinyl alcohol (PVA) as monomer and Sodium Borate as crosslinking agent, semi-interpenetrating (semi-IPN) hydrogels P(MAA/PAMPS)-PVA/ was prepared. The surface morphology and chemical state of hydrogels were characterized by scanning electron microscope (SEM), fourier transform infrared spectrum (FT-IR), gel permeation chromatography(GPC), thermogravimetric analysis (DSC-TG) and rheometer; The swelling behavior, pH-sensitive, self-healing were investigated. The test results showed that the hydrogels formed a stable IPN interpenetrating network structure and exhibited pH sensitivity, self-healing. Borate ester bond formed by PVA hydroxyl group and borate ion determines self-healing which is controlled by pH of the medium. The mechanical experiment indicated that the tensile strength of the self-healing hydrogel was 668 kPa, the elongation at break was 665%, and the self-healing efficiency was 81%.

Abstract:Using sodium bentonite as raw material, N-isopropyl acrylamide (NIPAM) is grafted on the surface of sodium bentonite through the dehydration condensation of silane coupling agent KH570 to prepare intelligent temperature-sensitive bentonite (NIPAM-B). The single-factor method was used to optimize the synthesis index of NIPAM-B, and XRD and FTIR technology were used to characterize NIPAM-B. At the same time, the temperature sensitivity of NIPAM-B and the rheology and suspension of NIPAM-B suspension were investigated. , And introduce acrylic acid (AA) monomer to realize temperature control. The results show that NIPAM-B has good temperature-sensitive characteristics, and the rheological properties of the intelligent temperature-sensitive bentonite suspension show steady flow characteristics and heating and thickening characteristics in the range of 40-60℃. However, the suspensibility of this smart temperature-sensitive bentonite is slightly lower than that of the original bentonite. In addition, after introducing the temperature control effect of AA, it is found that for every 10% increase in the ratio of the added amount of AA to NIPAM, the LCST of the smart temperature-sensitive bentonite will increase by about 10°C.

Abstract:A series of carbamate compounds were synthesized from carbon dioxide, aniline and its derivatives and brominated hydrocarbons, activated by 1,8-diazabicycloundec-7-ene (DBU) in N,N-dimethylformamide. The influences of solvent, temperature, initial pressure, base loading and mole ratios of reactants on the reaction has been investigated using a template reaction of aniline, 1-bromobutane and carbon dioxide. The optimal reaction conditions were obtained as follows: aniline 1.0 mmol, 1-bromobutane 2.0 mmol, DBU 2.5 mmol, initial pressure 0.25 MPa, reaction temperature 70 ℃ and N,N-dimethylformamide 0.5 mL. Under the optimal conditions, 24 carbamate compounds were synthesized with yields of 38%~91%. This mild and fast reaction system provides a highly efficient synthetic method for important carbamate compounds.

Abstract:Compared with the traditional lithography materials of petroleum raw materials, the new lithography materials based on natural polymers not only retain high-resolution lithography performance, but also have the advantages of renewable and non-toxic development. The classification, advantages and disadvantages of protein lithography materials and polysaccharide lithography materials in natural polymer lithography materials are systematically summarized in this article. Through in-depth research on the lithography mechanism of different materials, it is concluded that the lithography mechanism of protein lithography materials mainly relies on radiation to change the structure of the protein, so that its solubility changes in the developer to achieve lithography; and the natural polysaccharide lithography materials mainly rely on the introduction of photo-responsive groups to achieve lithography. Finally, the existing problems and development prospects of renewable lithography materials based on natural polymers are analyzed in this article.

Abstract:Recently, the fabrication of porous materials with micro/nano rough structures based on the models of special wettability have attracted considerable attention in the field of oil-water separation. In order to satisfy demands of highly efficient and high flux gravity directed oil-water emulsions separation in different situations, in this study, a series of polypropylene (PP) fabrics with different super wettability and roughness are fabricated by modifying the PP fabrics with different amounts of SiO2 nanoparticles. The performances of W/O and O/W emulsions separated by PP fabrics with different pore size and surface energy were experimentally observed, and the results showed that, the modified fabrics exhibited excellent water/n-hexane and water/toluene emulsion separation performance with separation efficiencies > 99.5% and fluxs > 700 L/(m2·h). Furthermore, the corresponding separation mechanisms were investigated, which provide a theoretical basis for the scientific design and controllable fabrication of future oil-water emulsion separation materials.

Abstract:The novel cadmium molybdenum phosphorous (CdMoP) series composite oxide catalyst was prepared by ionic liquid thermal synthesi, and the physicochemical properties of the catalysts were characterized by FT-IR, XRD, SEM, TEM and XPS. The characterization results show that the ionic liquid can not only enter the framework of the CdPMo-80 catalyst, but also fix the P element in the catalyst, thus presenting an orderly growth layered structure and having more strong acid centers. The catalytic performance of the CdMoP-80 composite metal oxide catalyst was investigated by using cyclohexene oxidation to prepare cyclohexane oxide as a probe reaction. The results indicated that the product was qualitatively and quantitatively analyzed after reacting for 4 hours at 55 oC with a catalyst dosage of 0.2 g, 4 mL of 30% hydrogen peroxide, 2 mL of cyclohexene, and 4 mL of acetonitrile. The conversion rate of cyclohexene was 99.2%, and the selectivity of cyclohexene oxide was 97.0%.

Abstract:Diester compounds are widely used in the fields of organic intermediates, drugs, plasticizers, spices and so on. In this paper, we reported that the deep eutectic solvent (DESs) catalyzed esterification of dicarboxylic acids with alcohol to synthesize diester compounds. The maximum yield of diester compound was up to 95%. After the catalyst was recycled for 8 times, the yield of the product is still over 88%. All products were characterized by 1H NMR and 13C NMR. This method has the advantages such as simple operation, high yield, easy separation and catalyst recycling.