Abstract:Catalytic dehydrogenation reactions find extensive applications in chemical industries production and hydrogen fuel production. It is therefore critical to develop efficient dehydrogenation catalysts that adapt to harsh reaction conditions. Layered double hydroxides (LDHs) have provided extensive applications in catalytic dehydrogenation because of its special two-dimensional layered structure, flexible adjustable of metal cations, and easy exchange of intercalated anions, which provides many intelligent design strategies for catalytic dehydrogenation applications. This article mainly reviews LDHs and their hybrid materials as catalysts, catalyst precursors or supports, and focus on their research progress in hydrogen storage materials dehydrogenation, direct dehydrogenation and oxidative dehydrogenation reactions. Furthermore, methods of preparing LDHs are briefly introduced. Finally, prospective research on LDHs and its derivatives used as catalytic materials in the field of catalytic dehydrogenation are proposed.

Abstract:Meat products are rich in nutrition but prone to corruption. Therefore, it is urgent to explore green and efficient technology for meat preservation. ε-Poly-L-lysine is a kind of natural antimicrobial peptide that possesses high antibacterial activity, strong stability, high biodegradability as well as good safety, which has great potential for food preservation and antisepsis. Currently, the composite films prepared by ε-poly-L-lysine and film-forming materials have become one of the research interests. Firstly, the basic properties, antibacterial activity and antibacterial mechanism of ε-poly-L-lysine are reviewed. Subsequently, the effects of ε-poly-L-lysine on the quality of meat products are discussed. Furthermore, the characteristics of the composite film prepared by ε-poly-L-lysine and proteins, polysaccharides and polyvinyl alcohol and their applications in the meat preservation are emphatically introduced. It will provide a reference for the high value development and utilization of ε-poly-L-lysine and the preservation of meat products.

Abstract:Sludge, as the residue after sewage treatment, contains various heavy metals, organic substances and microorganisms, which is seriously harmful to the environment and human health. Sludge-derived biochar-based materials exhibit promising application prospect in the field of advanced oxidation processes for water remediation due to the favorable porous structure, excellent surface charge distribution and abundant oxygen-containing functional groups. At present, multiple sludge biochar-based catalysts with high catalytic activity was employed successfully in the photocatalysis, persulfate activation and Fenton oxidation systems. Herein, the preparation methods of sludge biochar-based materials were summarized systematically. In addition, the degradation efficiencies and internal mechanisms of sludge biochar-based catalysts in different oxidation systems were analyzed comprehensively. However, the stability of sludge biochar-based catalysts should be enhanced to prevent the release of heavy metals and other contaminants in the future. Meanwhile, the catalytic activity and recyclability of sludge biochar-based catalysts in a continuous-flow reactor should be investigated to enhance the practical application potential.

Abstract:Abstract: The Polyester textile is flammable with serious dripping during combustion, which is prone to secondary damage, and greatly limits the widespread application of polyester textiles. Therefore, the de-velopment of flame-retardant polyester textiles is greatly significant. Bio-based flame retardant has be-come a rookie in the field of flame retardants in recent years with its advantages of green, environmental protection and sustainable development. Thus, they have promising prospects. This paper summarized the research status of bio-based flame retardant in polyester textiles at home and abroad. It introduced the ap-plication of phytic acid, chitosan, alginate, protein and other biomass macromolecules in the flame retard-ant modification of polyester textiles, and the flame retardant mechanisms of the above biomass macro-molecules were expounded. The superiority and weakness of various flame retardant finishing method, as well as the flame retardant efficiency of different biological macromolecules were compared. Finally, the research direction of bio-based flame retardant on polyester textiles was prospected, and it was pointed that developing multifunctional green and environmentally friendly flame-retardant polyester textile was an important trend in the future.

Abstract:The research progress of iron-based catalysts for Fischer-Tropsch to olefins(FTO) from syngas was reviewed. The process of reduction and activation was summarized, the active phase was distinguished, and the influence of carrier on the FTO reaction was discussed. Iron-based catalysts have attracted much attention due to their advantages such as low cost, easy availability and wide operating temperature range. However, many disadvantages such as complex phase, uncertain active phase and the need to improve the reaction performance are also the main problems. The activation process is directly related to the atmosphere, and the overall reaction trend is progressive from the surface to the bulk. The active phase FeCx is formed in the surface of the catalyst, and the reaction of ε-Fe2C→ε'-Fe2.2C→χ-Fe2.5C→θ-Fe3C gradually occurs with the temperature and reaction in CO containing atmosphere. θ-Fe3C has been reported to have good FTO reaction performance. In this paper, the research progress on the activity and active phase of Fe-based FTO catalysts in recent 10 years is briefly reviewed, and the regularity knowledge in these studies is sought in order to provide help for the study of the reaction performance of Fe-based catalysts for FTO reaction in the future.

Abstract:Polymer is easy to burn when heated, which may result in fire disaster. Thus, it is necessary to improve the flame retardant performance of polymer by employing flame retardants. Layered double hydroxide (LDHs) has attracted more and more attention in the field of flame retardant due to its halogen-free, non-toxic and excellent smoke suppression performance. In this paper, the structure, preparation methods, and flame retardant mechanism of LDHs were summarized. In particular, the methods to improve the flame retardant properties of LDHs, including cationic doping of laminate, interlayer anion intercalation, and surface modification, were emphatically reviewed. Moreover, the flame retardant mechanism and properties of LDHs with different structure were concluded. At last, the development trend of LDHs as flame retardant in the future has prospected. The aim of this paper is to provide guidance for the development of LDHs flame retardants and related researchers.

Abstract:Microemulsion and foam floodings are two important technics in enhanced oil recovery (EOR). The former one enhances the microscopic oil recovery efficiency, i.e., displacement efficiency, by using surfactant to increase solubilization ratio and decrease oil-water interfacial tension and capillary pressure; the latter one enhances the macroscopic oil recovery efficiency, i.e., sweep efficiency, by using foaming agent to generate foam in reservoir pores for blocking preferential flowing channels and swept zones. The advantages and limitations of two technics are illustrated here through the review of their developments and research advances. Microemulsion-foam flooding, also known as low-tension-foam flooding, that is a novel EOR technic proposed recently, can combine the advantages of the individual method, meanwhile overcome their limitations, ultimately enhance both microscopic and macroscopic oil recovery efficiency. However, there are theoretical and practical challenges for the microemulsion-foam EOR. By reviewing the research advances of this EOR method, the current challenges, potential solutions and research suggestions are discussed in details.

Abstract:Biochars have achieved extensive attention due to their unique pore structure and excellent adsorption performance. However, it is still a great challenge that how to effectively improve their adsorption efficiency and rapidly separate from aqueous phase. In this paper, synthesis methods of magnetic lignocellulose biochar composites are summarized base on the synthesis of magnetic nanoparticles. And the effects of pore forming methods, impregnation ratio, carbonization temperature, carbonization time and carbonization mode on the pore structure are compared. Furthermore, application research, adsorption mechanism and reutilization status of magnetic lignocellulose biochars in water treatment are introduced. Finally, future research emphases and directions for magnetic lignocellulose biochars are proposed according to its current challenges.

Abstract:The goal of this work is to create a fibrous membrane with high efficiency filtering and formaldehyde oxidation properties. Sol-gel and hydrothermal techniques were used to make titania (TiO2) and γ type manganese dioxide (γ-MnO2), respectively. Electrospinning was used to make thermoplastic polyurethane (TPU) composite nanofibers with different doping amount of TiO2 andγ-MnO2. The morphology, structure, and oxidation performance of the composite fiber membranes were studied using SEM, TEM, XRD, Physical adsorption and desorption instrument, FTIR and UV-vis. In a self-built air simulation experimental system, the filtration and formaldehyde removal effects of the composite fiber membranes were investigated. The results demonstrated that the composite membrane containing 8% TiO2 andγ-MnO2 nanoparticles had the best oxidation activity at 40 °C, with formaldehyde conversion reaching 90%. The oxidation of formaldehyde could be efficiently catalyzed by a fiber composite membrane loaded with a modest amount of oxide under low temperature air filtration.

Abstract:In the reverse micelle systems formed by cyclohexane and non-ionic surfactants Pluronic L44, Pluronic L64, NP-7, AEO-7, Triton X-10 and Brij-58 respectively, nickel nitrate was added and then reduced with the introduction of hydrazine hydrate, and then coated with silica which was realized by the hydrolysis of TEOS. The products were collected by centrifugation and dried under air and then calcinated under nitrogen atmosphere and reduced by hydrogen flow. The as-synthesized products were characterized by TEM and XRD. The results showed that hollow spherical structure was obtained when Brij-58 was used and hollow tubular materials when Pluronic L44, Pluronic L64, NP-7, AEO-7 and Triton X-100 were used. The formation mechanism was also investigated. The reduction of p-nitrophenol with NaBH4 as model reaction was used to test the catalytic activity of hollow Ni@SiO2-Brij-58. It showed that the conversion rate of p-nitrophenol was 97.6% within 15 min.

Abstract:In order to improve the cooling capacity of the converter valve phase change dispersion for converter valve cooling system are prepared with phase change materials(CrodaThermTM 47 and CrodaThermTM 53), emulsifiers(BrijTM S2 and Sympatens AS-100), nucleating agents(Polyvinyl alcohol) and deionized water as raw materials. The effects of different factors such as formulation and preparation technology of phase change dispersion on the properties of phase change dispersion are studied by experimental method. The best formulation (based on the total mass of phase change emulsion, the mass fractions of phase change material, emulsifier, nucleating agent and deionized water are 16%, 1.6%, 2.4% and 80% respectively) and shear process (shear rate 50 ks -1, lasting time 5 min) are determined. The convective heat transfer coefficient, conductivity, voltage stability and compatibility with cooling system are analyzed. The results show that the apparent specific heat capacity of the new phase change dispersion is 50% higher than that of deionized water, and the heat transfer capacity is 100% higher than that of deionized water. The key performance of the new phase change dispersion such as electroconductibility, insulation and withstand voltage parameters can meet the cooling application requirements of the converter valve.

Abstract:In order to prepare coatings with excellent moisture-proof performance, organic-bridged silane precursor 3-trimethonylsilylpropyl-2-methyl-3-[(3-trimethonylsilyl)propylsulfanyl]propionate (MPMA) were prepared by mercaptopropyl trimethoxy silane (MPTMS) and 3-(methylacrylloxy)-propyl trimethoxy silane (MATMS) via thiol-ene click reaction. The MPMA sol was obtained by hydrolyzation and condensation polymerization under acidic conditions through sol-gel method. Then the organic-bridged polysilsesquioxane coating were fabricated by depositing MPMA sol on glass slide through dip-coating method and on polyetherimide (PEI) through coating method, respectively. The moisture-proof performance of the coating was explored by measuring the water vapor transport rate (WVTR) and the effect of aging time on the moisture-proof performance of coatings was investigated. The results showed that the WVTR of coatings was as low as 3.13 g·m-2·d-1 when the sol aging time was 30 h, indicating that the coating possessed excellent moisture-proof property. Besides, the coating performed good optical transmittance, level 0 in adhesion evaluation test and 3H pencil hardness.

Abstract:TPU nanofiber membranes were firstly prepared by the electrospinning technique, and Ti3C2Tx-MXene/TPU nanofiber yarns were fabricated by the “Biscrolling” method. The obtained composite nanofiber yarns were characterized by SEM, electrical resistance test, sensing performance test and other techniques. The results showed that the tensile strength of the composite yarn was firstly increased and then decreased with the loading of MXene, and the breaking strain was more than 459%, demonstrating good elasticity. In addition, continuous and conductive MXene film can be constructed on the inner and outside the yarn, rendering the composite yarn with low electrical resistance (76 Ω/cm). The strain sensing performance of the composite yarns were also investigated, and the results revealed that MXene/TPU nanofiber yarns had the gauge factor and linearity of 477.86 and 0.995, respectively, which were higher than that of most of yarn strain sensors. In addition, the MXene/TPU nanofiber yarns can be used to monitor various motion states of human body.

Abstract:Abstract:Using conductive glass as the substrate, WO3 nano-film is prepared by hydrothermal method. Then WO3/ZnWO4 composite films with different hydrothermal reaction time (1h, 3h, 5h) were successfully prepared on WO3 nano-film. The synthesis and characterization of the WO3/ZnWO4 composite films were performed by X-ray diffraction test and scanning electron microscope test. The photoelectric performance parameters of WO3/ZnWO4 composite film samples were obtained by absorption spectrum test, photocurrent test, photoelectric catalytic test and AC impedance test. The analysis results show that the WO3/ZnWO4 composite film sample has a wider spectral response range, higher photocurrent density and significantly improved photoelectric catalytic efficiency than WO3 nano-film. The WO3/ZnWO4 composite film samples with hydrothermal reaction for 3h have the highest photocurrent density and the best photoelectric catalytic efficiency than the samples which hydrothermal reaction time is 1h and 5h.

Abstract:An isopropanol-based Gemini quaternary salt (GC-S) with organic counterion was synthesized from dodecyl dimethyl tertiary amine, epichlorohydrin and p-toluenesulfonic acid. The synthesis process was optimized by orthogonal experimental. The products were characterized by FTIR , 1HNMR and ESI-MS, which demonstrated the successful synthesis of the expected structures. GC-S had a high surface activity with a cmc of 24.06 mN/m and a CMC of 2.09×10-4 mol/L. GC-S was compared with conventional Gemini quaternary ammonium salt with chloride as counterions (GC-Cl) and single-chain quaternary ammonium salt (1231). The results indicated that GC-S had better wettability because of the shortest sink time (175.2 s) for canvas swabs in aqueous solution. GC-S showed better foaming and foam stabilization performance due to larger starting foam volume (390 mL) and smaller defoaming volume (20 mL). GC-S displayed better emulsification performance because the partition out the quantitative aqueous layer from the emulsification system of aqueous solutions with liquid paraffin needed a larger time (317 s). GC-S (10 mg/kg) showed very high antibacterial activity against both E. coli and Staphylococcus aureus.

Abstract:Indole-3-acetic acid (IAA) production by microbial fermentation has some advantages such as mild reaction conditions, low energy consumption, no employment of toxic and harmful substances, and low environmental pollution. A bacterial strain FX-02 with higher producing IAA ability was isolated and screened from the vegetable rhizosphere soils, and was identified as Enterobacter hormaechei by morphology, physiological and biochemical characteristics, and molecular biology. The fermentation characteristics of FX-02 for producing IAA were studied in this work. The results showed that the IAA biosynthetic pathway of FX-02 belonged to tryptophan-dependent type. The optimal concentration of tryptophan for FX-02 to synthesize IAA was 10.0 g/L, which also indicated that the tolerant concentration of FX-02 to tryptophan was high, in other words, it had very strong transformation ability of tryptophan to IAA. The best carbon and nitrogen sources and mineral salt for FX-02 to produce IAA were glycerol, peptone and calcium chloride, respectively. When the cultural medium (glycerol 10.0 g/L, peptone 10.0 g/L, tryptophan 10.0 g/L, MgSO4 1.5 g/L and K2HPO4 1.5 g/L) was used, and FX-02 was incubated at 30°C in a shaker at 180 r/min for 72 h, the IAA yield of FX-02 was higher.

Abstract:Cellulose diphenylphosphine polymeric ligands were synthesised from the renewable resource cellulose by P-O bond modification of hydroxyl groups in this paper. The ligands were complexed with copper acetate to prepare a new cellulose-based non-homogeneous copper catalyst with good thermal stability at a cracking temperature of about 245 ℃. The copper element was mainly present in the catalyst in the divalent form with a mass fraction 4.76%. Under air atmosphere and mild conditions, the catalyst Cell-OPPh2-Cu(Ⅱ) maintains high catalytic activity for the Chan-Lam reaction and the Ullmman reaction with the optimal yield up to 96% and 93%. The cyclic experimental studies showed that the yield drops from 96% for the first time to 86% for the eighth time in the Chan-Lam reaction, and therefore the catalysts have good stability, ease of use and high catalytic activity, and are potentially useful for the industrial synthesis of heterocyclic drug molecules.

Abstract:To further improve catalytic performance under solvent-free conditions, Pd/GO、Pd/rGO and Pd/C-HNO3 were studied with the commercial Pd/C with mass fraction of 10% as the control group. Among them, Pd/rGO exhibited the highest aniline yield within 1 h. Combined with the characterization results of XRD、XPS、N2-adsorption/desorption、SEM、TEM and HRTEM, the coupling effect between Pd nanoparticles and rGO nanosheets is confirmed, which results in the highest Pd specific surface area （178.37 m2/g） and Pd dispersion（43.75%） of Pd/rGO in the three Pd-based catalysts. When Pd/rGO catalyzed the hydrogenation of nitrobenzene in the condition of 10 g/L Pd/rGO，1 MPa H2，90 ℃，5 mL nitrobenzene, the yield of aniline increased with the reaction time. Nitrobenzene was completely transformed and the yield of aniline reached 100% within 100 min. In addition, Pd/rGO exhibited 97.1% aniline yields after recycling tests of nine times.

Abstract:An amphiphilic macromolecule was first synthesized by conjugation of hydrophobic small molecule L-phenylalanine ethyl ester (L-phe) to the natural macromolecule γ-polyglutamic acid (γ-PGA). Avobenzone (AVB), isooctyl methoxycinnamate (OMC) and benzophenone-3 (BP-3) as organic sunscreen agents were then loaded into the γ-PGA nanoparticles through the macromolecular self-assembly for the preparation of sunscreen nanoparticles. The photostability, broad-spectrum sunscreen properties, skin permeability and cytotoxicity of these γ-PGA-based sunscreen nanoparticles were characterized. Compared with the unloaded organic sunscreen composition, the decrease in UVA absorbance of γ-PGA sunscreen nanoparticles was reduced from 12% to 3%, and decreased from 18% to 4% in UVB absorbance after UV irradiation, which proved the photostability improvement. At the same time, the γ-PGA sunscreen nanoparticles have broad-spectrum sun protection in the entire ultraviolet band and low skin permeability and low cytotoxicity. Moreover, the γ-PGA sunscreen nanoparticles were used as sunscreen agent in a typical sunscreen formulation, and the sun protection factors (SPF) of the sunscreen can reach to 75 at the 10% mass fraction loading.

Abstract:L-Arginine (L-Arg) and lysine (L-Lys) with final concentrations at 1 g/L and 3 g/L were added to 20 g/L soy protein isolate (SPI) solution, respectively. The samples without the addition of L-Arg or L-Lys but with adjusting to the corresponding same pHs with of the added L-Ary or L-Lys were served as the control. These samples were then subjected to prepare oil-in-water (O/W) emulsions. The physical and chemical measurements and spectral scanning techniques were employed to detect the structure, physicochemical properties and emulsifying properties of SPI. Subsequently, the microstructure of the resulting emulsions was accordingly characterized. The results have shown that the addition of L-Arg and L-Lys increased the pHs of the SPI solutions and significantly improved the solubility (from 77.1% to max 91.3%), dramatically decreased the turbidity. Due to the protein folding of the hydrophobic group and resulting lowered protein hydrophobicity, L-Arg/L-Lys also effectively reduced the SPI particle size in the solution but also increased the charge, significantly reduced the size of emulsion droplets and promoted their uniformity. Consequently, the maximum 31.4% of the SPI emulsifying activity index and 78.9% emulsifying stability index of the L-Arg/L-Lys-treated samples were obtained. Comparatively, L-Arg was capable of modifying the SPI structure more effective than L-Lys to obtain enhanced emulsifying properties and the ameliorating effect was increased with the increasing concentrations of the two amino acids.

Abstract:A Co9S8/MoS2 composite has been prepared successfully via a one-step hydrothermal method. This 3D flower-like Co9S8/MoS2 electrocatalyst insitu grown on Ti mesh.Serving as an oxygen evolution reaction(OER) electrode, the obtained Co9S8/MoS2@TM delivers a current density of 10 mA/cm2 at low overpotentials of 316mV in alkaline media and small Tafel slope values of 88.5 mV/dec.The superior electrochemical properties of the Co9S8/MoS2@TM are attributed to 3d nanoarray,which both enlarging the electrochemical surface area(ECSA),and exposing abundant active sites,that ensures easy diffusion of electrolyte and fast release of gas products. Moreover,Co9S8/MoS2@TM exhibited high activity and 20h stability for OER .

Abstract:In this work, spiral-shaped carbon nanofibers were grown on nickel foam substrate an integral catalyst support with activity towards oxygen evolution reaction (OER) via a single-step facile (chemical vapor deposition) CVD method. In the three-electrode system with 1 M KOH electrolyte, integral catalytic support CNFs/NF electrode material exhibits a remarkable double layer capacitance Cdl value of 13.69 mF/cm2, which is proportional to the electrochemical surface area (ECSA). By means of electrochemical methods such as cyclic voltammetry, electrochemical impedance spectroscopy and linear scan voltammetry, it is proved that CNFs/NF is a suitable catalyst support with catalytic activity towards OER. CNFs/NF requires 260 mV, 385 mV OER overpotential to achieve 10 mA/cm2 and 100 mA/cm2 current density, respectively.

Abstract:Non-chrome metal tanned waste leather shavings were used as raw materials to be degraded by hydrogen peroxide catalytic oxidation for preparing bio-based protein filler. The degraded collagen hydrolysate (DCH) was then modified with dialdehyde sodium alginate (DSA) to prepare bio-based DCH (BDH). The structure and properties of DCH and BDH were characterized by FTIR, GPC, XPS and Zeta potential test. The results showed that DSA successfully modified DCH, and the weight-average molecular weight of BDH was increased from 3900 g/mol of DCH to 5570 g/mol as well as its isoelectric point was changed from 5.2 to 3.3. Compared with the crust leather without filling by protein filler, the properties of DCH and BDH filled crust leathers were significantly better, especially the tensile strength and fullness. Compared with the DCH filled crust leather, the tensile strength of BDH filled crust leather increased from 11.5 N/mm2 to 22.9 N/mm2, its tear strength increased from 58.1 N/mm to 80.9 N/mm and the softness increased from 7.2 mm to 7.9 mm. Besides, the fullness of BDH filled crust leather was further improved. Overall, the above-mentioned properties were better than those of crust leather filled using common commercial protein filler.

Abstract:In this study, the biocathode microbial fuel cell was constructed by using anion exchange as separator, which could remove ammonia nitrogen by simultaneous nitrification and denitrification process, degrade acetone and generate electricity. We investigated the effects of different acetone concentrations such as 50 mg/L, 100 mg/L, 300 mg/L, 500 mg/Land 700 mg/L on electricity generation and removal rate of ammonia nitrogen (200mg/L) for MFC. The results showed that the removal rate of acetone was more than 96% with the selected concentration. When the concentration of acetone was higher than 300 mg/L, the removal of ammonia nitrogen would be inhibited, and the highest removal rate of ammonia nitrogen was 73.7%. Besides, when acetone concentration was 300 mg/L, the corresponding MFC can achieve the highest power density of 49.7 mW/m2. High throughput sequencing technology was used to analyze the microbial community structure of anode and cathode. At the phylum level, the dominant microbial communities of anode were mainly Proteobacteria, Bacteroidetes and Firmicutes. While the dominant microbial communities of cathode were Bacteroidetes, Actinobacteria, Proteobacteria and Acidobacteria. At the genus level, the dominant bacteria of anode were Comamonas, Acetoanaerobium，Stenotrophomonas, while the dominant bacteria of cathode were Rhodoccus, Aridibacter, Thauera，Ignavibacterium.

Abstract:Copper slag based chemically bonded ceramics (CSCBC) prepared through the alkali activation of copper slag was used to adsorb Cr(Ⅵ) ions in the waste water. The influence of the addition amount of adsorbent, initial concentration of Cr(Ⅵ) and pH on the adsorption efficiency was investigated, and the adsorption mechanism was discussed by the adsorption kinetics and thermodynamics analysis and characterization of adsorbent before and after adsorption. The result showed that the adsorption equilibrium can be reached within 120min, the removal rate was up to 93% and the maximum theoretical adsorption capacity was 25.3mg/g at the optimal condition (adsorbent addition amount: 0.4g, initial concentration of Cr(Ⅵ): 100 mg/L, pH: 1.0) . CSCBC has higher adsorption capacity than the same type adsorbents such as biochar-based iron oxide composites, FeS composite and Cr(Ⅵ)able metal ion doped adsorbent. The adsorption process of Cr(Ⅵ) by CSCBC was in accordance with the quasi-first order kinetic model and Langmuir isotherm adsorption model. The adsorption mechanism can be explained from two aspects of reduction and physical adsorption. The adsorption capacity remained 75% of the initial adsorption capacity after 6 adsorption-desorption experiments.

Abstract:The clay-biochar adsorbent(SBEC) and the clay carbon-based adsorbent (SBE) were prepared using spent bleaching earth and durian shell for hexavalent chromium removal from wastewater. The structure of the adsorbents were characterised by SEM,FTIR, XRD and BET. The influence of variables like initial metal loading, pH, contact time, and adsorbent dose were studied. Results showed maximum removal efficiency for Cr(VI) at 120 min contact time, adsorbent dose of 0.5 g/L and pH 3 by SBEC and pH 2 by SBE. Pseudo-second-order kinetics was the most suitable model for the removal of chromium. Freundlich isotherm model showed fit to SBEC and Langmuir model fitted to SBE. The interaction of SBEC and SBE with the simulated wastewater was spontaneous and endothermic interaction. The adsorption efficiency of SBEC was 58.8% after five adsorption-desorption tests.

Abstract:Thickener (Z)-N-{3-[bis(2-hydroxyethyl)amino]propyl}docos-13-enamide (UC22-OH) for fracturing was synthesized from acrylonitrile, diethanolamine and erucic acid. Its chemical structure was characterized by 1H NMR, 13C NMR and HPLC-MS, which proves that the product was consistent with the target product. The effect of temperature on the apparent viscosity of fracturing fluid was studied, and the type and size of micelle aggregates at high temperature were analyzed. The rheology, sand-carrying, gel breaking and formation damage performance of the UC22-OH system were evaluated. The results showed that the clean fracturing fluid system was with a mass fraction of 4% UC22-OH, its apparent viscosity maintains 65 mPa·s under a shear rate of 170 s-1 at 120 ℃ for 1.5 h, indicating that UC22-OH clean fracturing fluid has excellent temperature resistance and shear resistance performance. At 80 ℃, the values of the elastic and viscous modulus (G' and G'') of the clean fracturing fluid system are >4.2 Pa and >1.7 Pa respectively. When the sand content is 20%, it can stably suspend sand within 2 h at 80 ℃. The system was completely broken within 70 minutes after encountering kerosene, and the surface interfacial tension value of the micelle-breaking fluid is low, which shows that the fracturing fluid system has excellent sand-carrying performance and micelle-breaking flowback performance at 80 °C; In the formation damage evaluation experiment, comparing the three fracturing fluid systems, the UC22-OH fracturing fluid system had the lowest permeability damage rate, only 9.1%. By comparing various performance indexes of fracturing fluid, it was found that UC22-OH clean fracturing fluid had the advantages of high temperature resistance, low residue, low damage, stable sand carrying, and easy flow interruption.

Abstract:Phosphinimides are widely used in organic synthesis, biomedicine, polymer compounds and other fields. It is of great scientific significance to develop a new efficient and green method synthesis for the synthesis of phosphinimides. In this paper, visible light-induced TiO2-catalyzed the reaction of triphenylphosphine compounds with 3-aryl-1,4,2-dioxole-5-one for the synthesis of phosphinimides at room temperature was described, and the highest yield was up to 97%. The structure of the product was characterized by 1HNMR and 13CNMR. The reaction has the advantages of mild conditions, green and high efficiency.