Abstract:With the rapid development of the world economy, serious energy shortages and environmental crises have emerged, and photocatalytic technology is an effective solution to alleviate this problem. Bismuth trioxide, due to its unique layered structure and narrow bandgap, has the potential for visible-light-driven photocatalytic performance and has gradually become one of the recent research hotspots in the field of environmental energy science. This paper outlines the current research status of bismuth trioxide photocatalytic materials, and describes their construction strategies, removal effects and main mechanisms. Its applications in environmental energy fields such as photocatalytic water environment treatment, hydrogen production by water decomposition, nitrogen fixation and desulfurisation, bactericidal disinfection, carbon dioxide reduction, battery electrode, etc., are also described and prospected.

Abstract:In recent years, in order to further reduce the carbon capture energy consumption caused by CO2 generation in coal-fired power plants, phase change absorbers based on traditional organic amine chemical absorbers have become a research hotspot in CCUS (CO2 capture, utilization, and storage) technology. Compared to traditional organic amine phase change absorbers, new phase change absorbers have better performance. Starting from the classification, process flow, and research progress of traditional phase change absorbers, this article elaborates on the limitations of their development due to issues such as viscosity, proportion of rich phases, and cost. In response to the above issues, combined with solvent composition and phase change mechanism, this paper focuses on the review of new phase change absorbers represented by physical solvent type phase change absorbers, which can be mainly classified into three categories: alcohol amine mixed type, sulfone amine mixed type, and ether amine mixed type phase change absorbers; At the same time, introduce and analyze the research status of various absorbents from the aspects of phase separation and performance improvement, compare the advantages and disadvantages of various solvents, and conduct in-depth analysis; Finally, based on the current research status and industrial application needs, suggestions are given for the research direction of physical solvent based phase change absorbers.

Abstract:CO2 is a major greenhouse gas, but also an abundant, cheap and not widely used carbon resource. The direct production of dimethyl carbonate (DMC) from CO2 and methanol is of great significance in the context of “dual carbon goals”. However, the CO2 conversion and DMC yield are too low due to the reaction thermodynamic limitations and inertness of CO2. CeO2-based catalyst is a kind of catalyst with good performance in the direct synthesis of DMC from CO2 and methanol, which has been extensively reported in literature. Therefore, this review focuses on the thermodynamics of the direct synthesis of DMC from CO2 and methanol and the research progress of the reaction mechanism and catalyst studies over CeO2-based catalysts. It also details the methods for controlling the morphology and surface properties of CeO2-based catalysts and the coupling of high-efficiency dehydration agents. It also points out that future work can be carried out in the preparation of CeO2-based catalysts with high specific surface area and high concentration of active sites, in-situ characterization of oxygen vacancy concentration, and the development of new inexpensive and efficient dehydration agents.

Abstract:At present, the environmental pollution problem caused by the wide application of fiber materials synthesized from petrochemical industry is becoming more and more serious, so it is urgent to develop new green fiber materials. Due to its renewable and degradable properties, fiber plants have attracted much attention in the current environment with an emphasis on green development, especially in the field of reinforced thermoplastic composites. In recent years, the use of fiber plants thermoplastic polymers to obtain composites with excellent properties has gradually developed into a mature technology. In this paper, we summarize the current treatment methods of fiber plants and the latest research results of the application of fiber plants in non-degradable and degradable thermoplastic composites, in order to provide more advanced ideas and methods for the development and utilization of thermoplastic green materials.

Abstract:Enzyme immobilization is a promising approach for the industrial application of enzymes, and the design of the carrier is a key factor. Metal-organic frameworks (MOFs) is highly ordered porous materials with clear structure-function relationships, uniform pore aperture distribution, tunable and designable porosity at the atomic level. There have been significant advances in the research of MOFs as enzyme carriers in the past ten years, and the related methods and applications have been systematically reviewed previously. However, few review focus on the influence of porosity on property of immobilized enzyme. Thus, this review focuses on the systematic introduction of the influence of pore structure on the properties of immobilized enzyme. Firstly, the formation mechanism of MOFs pores is analyzed, followed by a review of the progress in loading enzymes in cage-type cavities and channel-type pores, as well as the influence of porosity on catalysis process. As prospect, the advantages of hierarchical porosity in substrate diffusion and the importance of developing porosity - enzyme matched MOFs are discussed firstly. Then, the advantages of fabricating MOFs-Enzyme cascade catalyzer with minimized diffusion resistance within confinement under nanoscale,and the enhancement of enzymatic catalysis through microenvironment adjustment are analyzed as well.

Abstract:Polysaccharide-based thermosensitive injectable hydrogels, as a class of smart soft-matter materials, are capable of realizing reversible liquid-solid transition under different temperature stimuli, and have the advantages of high biocompatibility, biodegradability, and tunable physical and chemical properties, which have attracted wide attention in the biomedical field. In this review, the sol-gel phase transition mechanism of thermosensitive injectable hydrogels is summarized; The strategies of designing and synthesizing polysaccharide based thermosensitive injectable hydrogels were described, including small molecule group modified polysaccharide, synthetic thermosensitive polymer grafted polysaccharide, additive modified polysaccharide, etc.; The applications of polysaccharide based thermosensitive injectable hydrogels in biomedical fields such as wound healing, drug delivery and cartilage repair were reviewed, The challenges of optimizing raw material composition and design strategy, developing diversified environmental stimulus responses, and enhancing mechanical strength and stability are also suggested. Finally, the prospect of expanding the application scope of polysaccharide-based hydrogel and accelerating their wide-scale clinical application is prospected.

Abstract:Using titanium-containing blast furnace slag produced during the smelting process of vanadium titanium magnetite concentrate as raw material, porous zeolite molecular sieve adsorbent was synthesized by the step of "acid treatment-alkali melting-hydrothermal crystallization". The effect of sodium metaaluminate addition on the structure type of porous zeolite was investigated. Dynamic adsorption method was used to evaluate the CO₂ adsorption performance of the as-synthesized samples under different conditions, and the adsorption behavior was analyzed by data fitting with different kinetic models. The results of XRD、SEM、FTIR characterizations showed that the hydrothermal crystallization product in turn completed the transformation from “amorphous-preliminary crystallization-FAU type-LTA type” zeolite molecular sieve structure with the increase of sodium metaaluminate addition. The results of CO₂ adsorption experiments showed that the Z-4 sample activated at 350 °C exhibited excellent adsorption performance at adsorption temperature of 25 °C, with the CO₂ breakthrough and saturation adsorption capacities reaching 2.16 mmol?g_-1 ^{and 3.39 mmol?g}_-1^, respectively. The CO₂ adsorption behavior conformed to the pseudo-second-order kinetic model, and the adsorption was mainly physical and chemical adsorption, and the adsorption rate could reach 4.709 mmol?g_-1^?s_-1. After 5 regeneration cycles, the saturation adsorption capacity remained basically unchanged, showing a good cyclic stability.

Abstract:Keggin-type monosubstituted polyoxometalate ionic liquid catalysts ( POM-ILs ) were prepared. The structure, thermal stability, crystal structure, catalyst morphology and elements of the catalysts were characterized and analyzed by infrared spectrometer, thermogravimetric analyzer, X-ray diffractometer, field emission scanning electron microscope and X-ray energy spectrometer. The catalysts were applied to catalyze the reaction of mixed dibasic acid dimethyl ester ( DBE ) and ethylene carbonate ( EC ) to synthesize polyglycol mixed dibasic acid ester. The catalytic performance of different catalysts was discussed, and the optimal catalyst was selected for orthogonal test to explore the optimal process conditions of the reaction.Structural characterization, thermal stability, thermal properties and molecular weight distribution determination of polyglycol mixed dibasic acid ester were analyzed using infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetric analysis and gel permeation chromatography.The structure characterization, thermal stability, thermal properties and molecular weight distribution of polyglycol mixed dibasic acid ester were analyzed by infrared spectrometer, thermogravimetric analyzer, differential scanning calorimetry and gel permeation chromatography.The results showed that the polyglycol mixed dibasic acid ester was successfully synthesized, and its main properties were similar to those of poly ( ethylene glycol succinate ). Under the same process conditions, the tin monosubstituted zinc tungstate ionic liquid catalyst [ Bmim ]6ZnW11SnO39 ( H2O ) had the best catalytic performance.Under the optimal process conditions, the yield of poly(ethylene glycol) mixed dibasic acid prepolymer reached 50.19%, and the selectivity could reach 54.89%, the optimal time to explore the polycondensation reaction was 3.5 h, and the optimal temperature was 220 ℃, and the number average molecular weight of poly(ethylene glycol) mixed dibasic acid), Mn, could reach 14,433, and the poly(ethylene glycol) mixed dibasic acid had good melt-processing properties and thermal stability properties.

Abstract:The MOF-199@ACF adsorbent was prepared by using MOF-199, a metal-organic framework material with good selectivity to H2S, loaded with activated carbon fiber (ACF) under hydrothermal conditions. The H2S removal performance of the adsorbent was evaluated by a fixed bed reaction device. The phase composition of MOF-199@ACF was characterized by nitrogen adsorption/desorption, XRD, EDS, SEM and XPS. The effects of ACF loading capacity, adsorption temperature and relative humidity on the H2S removal performance of MOF-199@ACF were investigated, and the possible reaction mechanism of MOF-199@ACF in the H2S removal was investigated. The results showed that the H2S emergence time of MOF-199@1%ACF with 1%ACF load was delayed to 405 min compared with 180 min of MOF-199, and the sulfur penetration capacity was increased from 7.2 mg/g to 14.5 mg/g. ACF loading of 1% did not interfere with the stable structure of MOF-199 crystallization. The coordination of ACF roughened the MOF-199@1%ACF surface, exposing more adsorption sites and increasing the specific surface area (from 1108.6 to 1978.3 m2/g). MOF-199@1%ACF is mainly activated adsorption by chemical adsorption, and increasing the temperature (30-70 ℃) can accelerate the adsorption rate. A moderate amount of water vapor (relative humidity 10%) helps to improve performance (penetration sulfur capacity 14.8 mg/g).

Abstract:Aiming to improve the mechanical and barrier properties of starch/chitosan composite films, different content of carboxyl-terminated hyperbranched polyester (HPC) (1.25%, 2.50%, 3.75%, 5.00%, w/w, based on the dry weight of starch and chitosan) was introduced to prepare starch/chitosan/HPC composite films (labeled as SCH). Results from physical performance tests indicate that the inclusion of HPC increases the thickness and density of the composite films, notably enhancing tensile strength while maintaining fracture elongation of the films. Addition of 2.50% (based on the dry weight of starch/chitosan) HPC elevates the tensile strength from 2.26 MPa in the control group to 3.58 MPa, with no significant reduction in fracture elongation (measuring 151.04% and 146.40% respectively). UV-visible absorption outcomes reveal that the introduction of HPC induces strong absorption within the 280-320nm range, with absorption intensity increasing with higher amounts of added HPC. Through comprehensive analysis techniques including FTIR, XRD, SEM, DSC, and TG, it was revealed that strong intermolecular force forms between HPC and starch/chitosan through hydrogen bonding and esterification, resulting in a uniform and dense internal structure, increasing surface roughness and thermal stability. The change in water contact angle on the composite film"s surface is minimal, exhibiting an overall hydrophobic nature (greater than 106°). Additionally, the inclusion of HPC reduces the water vapor permeability of the composite film; the addition of 2.50% HPC decreases vapor permeability from 2.85 to 2.13 g·cm/cm2·h·Pa.

Abstract:Abstract: Currently, most fluorescent probes can only detect polarity or viscosity value singly, which is ?not conducive to the multifactorial analysis of disease models. Moreover, the reported fluorescent probes that detect viscosity or polarity generally have small Stokes shifts, which can easily lead to large background interference and fluorescence quenching. To this end, we synthesized a novel near-infrared fluorescent probe, YA-B12, based on a fungal fluorescein with bioluminescent properties, which exhibits a large Stokes shift of 178? nm in H2O and fluorescence emission wavelength of 700 nm in aqueous solution, and is capable of responding to viscosity and polarity at the same time. The fluorescence intensity of the probe increased 7-fold from low viscosity (2.4 cP) to high viscosity (360.9 cP), and the fluorescence emission wavelength of the probe was red-shifted from 606 nm to 698 nm from small-polar n-hexane to large-polar methanol. The probe demonstrated high selectivity, high sensitivity, and excellent immunity to interference for the detection of viscosity and polarity.

Abstract:A new type of copper-dopped carbon dots (CuQACDs) with photothermal/ photodynamic synergistic antibacterial ability was prepared via a one-step hydrothermal method using the aqueous solution of CuCl2 and allyl trimethyl ammonium chloride. The CuQACDs was characterized by TEM, FTIR, XPS, Raman, and UV. The obtained CuQACDs were well-dispersed spherical nanoparticles, with the average particle size of 4.9 nm and the zeta potential of +8.17 mV. CuQACDs had a photothermal conversion efficiency of 21.7% and could produce ROS in bacterial cells while being irradiated by a single laser of 808 nm at 1.5 W/cm2. CuQACDs expressed excellent antibacterial capability to E. coli. And S. aureus. The cell viability of E.coli and S.aureus was1.67% and1.06%, respectively after irradiation for 10 min with 808n m laser at1.5 W/cm2. SEM images showed that the surface of bacteria crumpled and ruptured after laser irradiation, leading to bacterial death. This study supplies a highly efficient nanocarbon antibacterial material and multimodal antibacterial method for killing pathogenic bacteria and healing the wounds.

Abstract:In order to explore the influence of electron donor-acceptor structure on the photocatalytic performance of covalent organic frameworks (COFs), N,N"- p-acetonitrile-phenyl -1,4,5,8- naphthalimide (NBA) as basic building monomer was condensed with electron-donating tri (4- formyl) aniline (N-CHO) and electron-withdrawing 1,3,5- tri -(4- formyl) triazine (TFPT) to synthesize C=C linked NN-COF and NT-COF respectively. The average oxygen evolution rates of NN-COF and NT-COF were 303.73 μmol g-1 h-1 and 449.53 μmol g-1 h-1 with 7.4 mg Co(NO3)2?6H2O as cocatalyst. Through structure, morphology and photoelectric performance characterization, it was confirmed that compared with NN-COF, NT-COF showed tighter interlayer π-π stacking, wider visible light absorption range and better photo-generated carrier generation due to the electron-withdrawing ability and high planarity of its triazine unit. The electron-deficient naphthalimide unit of NT-COF is more conducive to the accumulation of photo-generated holes on its heteroatoms, thus catalyzing the oxidation reaction of water molecules more efficiently.

Abstract:First, the optimal process of enzymatic extraction of basil seed gum was determined by single factor experiment and response surface experiment. Then, four different methods including conventional method, microwave method, ultrasonic method and enzymatic method were compared to extract basil seed gum, and its yield, gel strength, water retention, swelling property, color, microstructure, rheological properties, active components and antioxidant properties were determined. The physicochemical properties of basil seed gum extracted by different methods were analyzed. The results showed that the yield of basil seed gum extracted by enzymatic method was the highest, reaching 13.05%, and the water retention was the best. The microstructure showed that the gel extracted by enzymatic method had a network structure. The dynamic rheological temperature scanning model showed that basil seed gum was quite stable hydrocolloid, and the gel extracted by enzymatic method was the most stable. The gel extracted by enzymatic method could retain the active ingredients to the greatest extent, and the scavenging rate of DPPH free radical reached 20.6%, and the scavenging rate of ABTS cationic free radical reached 8.7%.

Abstract:Using the residue after extraction of Auricularia auricula polysaccharides, the optimal process of Auricularia auricula dietary fiber (AADF) was investigated by ultrasonic synergistic enzymatic digestion, and the hypoglycemic effect of AADF was further explored by in vivo experiments. The results showed that AADF was best prepared under the process of the material-liquid ratio of 1:15 g: mL, ultrasonic power of 350 W, ultrasonic time of 50 min, and high-temperature-resistant α-amylase dosage of 5% (as a percentage of the mass of black fungus residue), with an extraction rate of 69.18%, which was superior to that of the traditional alkaline extraction method. The results of in vivo tests in mice showed that gavage of AADF had no abnormal effects on the physiological state of mice, and the growth of body mass and the glossiness of fur were abnormal. The hypoglycemic effect in diabetic mice showed that under the intervention of AADF, compared with the model group mice, the fasting blood glucose value of the rest of the gavage dose group mice was decreased by 13.72%, oral glucose tolerance was reduced by 16.95%. The total blood lipid cholesterol and triglycerides of diabetic mice were significantly reduced, and the content of high-density lipoprotein cholesterol was increased. Glutathione peroxidase in serum, catalase in the liver, succinate dehydrogenase activity significantly increased. Histopathological analysis of liver also showed that AADF had a certain protective and repairing effect on liver injury in diabetic mice. The present experimental study demonstrated that Auricularia auricula dietary fiber could effectively improve the physiological indexes of diabetic mice and provided a reference for further research and rational development of Auricularia auricula dietary fiber.

Abstract:Using Pt(NH3)4Cl2 and Pd(NO3)2·2H2O as the precursor salts of Pt and Pd, Pd-Pt/HZSM-5 catalysts with different silicon-aluminum ratios 〔n(SiO2)∶n(Al2O3)=38, 200, 800〕 were prepared by impregnation method. The phase composition, pore structure, microstructure, chemical state and surface acidity and basicity of the catalysts were characterized by XRD, SEM, TEM, Raman, XPS, CO2-TPD and NH3-TPD, and the catalytic activity of the catalyst for low concentration (0.5% by volume fraction) methane combustion was tested by a fixed bed reactor. The results showed that the activity of Pd-Pt/HZSM-5 catalysts with different silica-alumina ratios was significantly different, and the Pd-Pt/HZSM-5(38) catalyst supported by HZSM-5 molecular sieve with Si/Al ratio of 38 showed the best catalytic performance. Compared with Pd-Pt/HZSM-5(800) and Pd-Pt/HZSM-5(200) catalysts supported by HZSM-5 molecular sieve with Si/Al ratio of 800 and 200, the ignition temperature (T10) of Pd-Pt/HZSM-5(38) catalyzed low concentration methane combustion decreased by 27.54 and 30.92 ℃, respectively, and the complete conversion temperature (T90) decreased by 3.38 and 17.51 ℃, respectively. Various characterization showed that Pd-Pt/HZSM-5(38) catalyst had smaller Pd/Pt particle size (6.3 nm), the most PdO crystals, active Pd/Pt species and acidic sites, the highest n(Pd0):n(Pd2+), and the highest Pt mass fraction (0.19%). These may be the reasons for its highest catalytic activity. In the stability test, the methane conversion rate of Pd-Pt/HZSM-5(38) catalyst was more than 99.6% and the activity did not decrease significantly within 150 h of stable operation at 360 ℃.

Abstract:In order to solve the problems of serious destruction of secondary structure, low molecular weight and long extraction time of regenerated keratin extracted by traditional reduction method, chicken feather was dissolved and keratin was extracted and regenerated by deep eutectic solvent (DES). In this study, different types of DES were used as solvents. By comparing the extraction rate and molecular weight of regenerated keratin extracted from them, DES with less damage to diagon protein and higher extraction rate was screened. The extraction process was optimized from three aspects: reducing agent, temperature and water content in DES. The hydrogen bond network structure in DES solvent was analyzed by density functional (DFT) theory and solvent color parameters, and the weak loss dissolution mechanism of chicken feather keratin was studied. Finally, the optimal extraction process is as follows: ethanolamine: choline chloride = 2:1 (molar ratio) water bath heating to obtain DES, the ratio of solid to liquid is 1: When the oil bath is heated at 30,65 ℃ for half an hour, the extraction rate of regenerated keratin is 31.8%, and the molecular weight is up to 66KDa, which is 100% higher than the molecular weight of 33KDa of regenerated keratin extracted by traditional reduction method.

Abstract:For the first time，a novel method to synthesize acetone from isobutane and oxygen is proposed. Tert-butyl hydroperoxide (TBHP) is generated from isobutane and oxygen firstly, and then TBHP is catalytically decomposed to acetone. The optimal reaction conditions, catalytic system, stability and recyclability of the catalyst, and the causes of catalyst deactivation for the catalytic decomposition of TBHP to acetone were investigated. The results indicated that the acid property of the zeolite catalysts had a very obvious influence on reaction activity. The β zeolite possesses the optimal catalytic activity (100 % conversion) and the selectivity to acetone (49 wt%) than Y zeolite and ZSM-5 zeolite. Furthermore, the selectivity to acetone decreased significantly during the 30 h-reaction cycle with the catalyst of β zeolite, indicating that the catalyst was less stable. Moreover, the catalytic performance of β zeolite can be fully recovered even after regenerating for 5 times. By pretreating the catalyst with different products, it was determined that further reaction of acetone was the main reason for catalyst deactivation; the stability of the reaction for 30 h was significantly improved by diluting the feedstock with ethanol, and the catalyst"s reactivity as well as reusability were not affected.

Abstract:A series of MoBiFeCoK mixed-oxide catalysts were prepared by the co-precipitation method using (NH4)6Mo7O24·4H2O, Bi(NO3)3·5H2O, Fe(NO3)3·9H2O, Co(NO3)2·6H2O , and KNO3 as the precursor metal salts to investigate the relative contents of the main metals Mo and Bi, the co-metals Fe and Co, and the doped K. The performance of the catalysts for the gas-phase oxidation reaction of isobutene was investigated. The relative contents of the main metals Mo and Bi, the co-metals Fe and Co, and the doped metal K were investigated to determine the performance of the catalysts in catalyzing the gas-phase oxidation reaction of isobutene. The catalysts before and after doping with K were characterized by SEM, EDX, XRD, and NH3-TPD, and the catalysts were optimized to catalyze the reaction conditions of the gas-phase oxidation reaction of isobutene and tested for the catalytic stability of the catalysts for 100 h. The results showed that the relative contents of Bi, Fe, Co, and K had a significant effect on the catalytic performance of MoBiFeCoK mixed-oxide catalysts for the gas-phase oxidation reaction of isobutene, with Mo12Bi1.2Fe3Co8K0.4 showing the optimal catalytic performance; the NH3-TPD characterization showed that the doping of K lowered the amount of the acid center of the catalysts (from 15.27 μmol/g of Mo12Bi1.2Fe3Co8 to 5.91 μmol/g of Mo12Bi1.2Fe3Co8K0.4) and significantly enhanced the selectivity of the main product methacrolein (MAL); the optimal conditions for the gas-phase oxidation reaction of isobutene were as follows: 0.66 g of Mo12Bi1.2Fe3Co8K0.4 as catalyst, reaction temperature of 320 ℃, n(O2):n(isobutene) (oxygen-alkene ratio)=10:1, and volume-air velocity (GHSV)=2000 h-1. The catalytic isobutene gas-phase oxidation reaction of Mo12Bi1.2Fe3Co8K0.4 was stable for 100 h, and the isobutene conversion was maintained at 98.6%, and the selectivity of MAL was maintained at 86.4%.

Abstract:A significant amount of resources is contained within the sludge, and the achievement of sludge reduction and resource utilization is considered a global environmental challenge. High-value TiO₂ nanoparticles are recovered from the titanium-coagulated algae-rich sludge through the application of a one-step calcination method, and a Pt-loaded titanium dioxide photocatalytic material (Pt@TiO₂) is obtained through photodeposition, effectively enabling the resource utilization of the sludge.Pt@TiO₂ with nanospherical (mesoporous) structure, and lowband gaps (compared to P-25), were obtained. Based on the results of electron spin resonance spectroscopy (ESR), hydroxyl radicals and superoxide radicals are produced by the recovered Pt@TiO₂ under illumination, both of which can be utilized as active oxidative species involved in oxidation reactions. The impact of Pt@TiO₂ dosage, solution pH, 4-chlorophenol (4-CP) concentration, and humic acid concentration on the photocatalytic performance of Pt@TiO₂ was investigated. The results indicate that under ultraviolet light irradiation, 0.3% Pt@TiO₂ can completely degrade 20 mg/L of 4-CP within 60 minutes. Recycled Pt@TiO₂ was subjected to cyclic tests, and even after five cycles, 92.5% of 4-CP could still be degraded. This study offers a method for the resource recovery and reuse of algae-rich sludge, presenting a new avenue for achieving environmentally sustainable development.

Abstract:Layered double hydroxides (Ti-Al LDHs) with varying Ti/Al molar ratios were fabricated as adsorbents via the co-precipitation method, employing aluminum chloride, titanium chloride, and sodium hydroxide as raw materials. The influence of the composites on the F- adsorption performance under diverse conditions was examined. The Ti-Al LDHs and the recovered products after the reaction were characterized by SEM, BET, and XRD. The results indicated that the Ti-Al LDHs were more stable, exhibited a uniform stacking of the layer-like structure, and predominantly existed in a dispersed amorphous form with a wide pore size and a large specific surface area (108.34 m2/g). The experimental findings demonstrated that the maximum adsorption capacity reached 47.78 mg/g under the conditions of a dosage of 0.2 g/L, pH = 4, and a temperature of 35 ℃. The adsorption of fluoride by Ti-Al LDHs was more in line with the proposed second-order model (R2 > 0.99), and the adsorption isotherm was more consistent with the Langmuir model. After five adsorption-desorption cycles, the adsorption capacity was still equivalent to 73% of the initial capacity, presenting good regeneration performance. Ion exchange occurred between F and hydroxyl groups on the surface of Ti-Al LDHs, and the adsorption process was mainly attributed to ion exchange, electrostatic attraction and surface complexation.

Abstract:Palygorskite supported In2O3/In2S3 composites (PGS-In2O3/In2S3) were prepared by hydrothermal method using In2O3, thioacetamide and palygorskite as raw material. The composition and internal structure of composites were characterized by XRD, SEM, TEM, BET and UV-vis DSR. Its electrochemical impedance spectroscopy was tested by electrochemical workstation. The performance of PGS-In2O3/In2S3 with different PGS mass fraction, ion interference and cycling performance were studied in photocatalytic degradation of methyl orange (MO). The results indicate that the agaric-like nanosheets of In2S3 and needle-like palygorskite are attached on the surface of particles In2O3 in PGS-In2O3/In2S3. And the composites exhibits stronger light absorption in the range of 200-580 nm. 50%PGS-In2O3/In2S3 with 50% mass feaction of PGS has the highest photocatalytic activity for degradation of MO. The photodegradation rate of 20 mg/L MO is 98.9% by 20 mg of 50%PGS-In2O3/In2S3 for 30 min under visible light. The main active species are ?O2? and h+ in photodegradatlon reaction. Except for H2PO4-, the common ions in solution have no effect on photodegradation of MO including Na+ and Cl-. Moreover, the composites show better physical adsorption and photocatalytic degradation for various dyes including malachite green (MG), Rhodamine B (RhB), crystal violet (CV) and methylene blue (MB). The built-in electric field reduces the recombination of In2O3/In2S3 photogenerated carriers between acidified palygorskite and In2O3/In2S3. It is the key to 50%PGS-In2O3/In2S3 having good photocatalytic activity for dye degradation.

Abstract:Weather-resistance plasticizers of hexa-hydro-phthalic ethylene glycol ether esters (HHPE) were synthesized using hexa-hydro-phthalic anhydride and ethylene glycol ether (ethylene/diethylene /triethylene/tetraethylene glycol glycol methyl ether, ethylene/diethylene/triethylene glycol butyl ether) as feedstocks via direct esterification. The structures of resulting products were confirmed by _¹H NMR and FT-IR, respectively. In addition, performances of mechanical, microstructure, thermal stability, migration resistance the volatilization resistance, as well as weather resistance of PVC plasticized by HHPE were systematically investigated. The results indicated that the plasticization of HHPE increased along with the increase of the number of ethoxy group when the ethoxy units in the structure were less than 4. Compared with the PVC sample plasticized by dioctyl phthalate (DOP), the elongation at break and the initial thermal decomposition temperature (T_5%) of the products plasticized by hexa-hydro-phthalic anhydride di (triethylene glycol methyl ether) ester (HHPTEM) respectively increased by 88% and 20.2 ℃, while the migration in n-hexane and toluene, as well as the volatility at 70 ℃ of HHPTEM/PVC decreased by 7.6%, 4.9% and 1.9%, respectively. Additionally, the retention rate of elongation at break increased by 8.6% after 10 days of UV aging.

Abstract:The immobilized lipase Novozym 435 was used as catalyst, toluene was used as solvent, and 4? molec-ular sieve was added to catalyze the esterification reaction of isosorbide and hexanoic acid to prepare isosorbide dihexanoate (SDH). Four factors (reaction time, reaction temperature, enzyme addition amount, 4? molecular sieve dosage) were selected by single factor experiment for response surface analysis. The results showed that the yield of isosorbide dihexanoate was 93.77 % under the optimal conditions of toluene 10 mL, n ( isosorbide ) = 0.03 mol, n ( isosorbide ) ∶ n ( caproic acid ) = 1 ∶ 6, reaction time 43 h, reaction temperature 40 °C, immobilized lipase Novozym 435 0.1 g and 4? molecu-lar sieve 2 g.

Abstract:In this study, a stable acrylate copolymer latex has been prepared through emulsion polymerization using styrene, butyl methacrylate and methyl methacrylate as main monomers, beheneth-25 methacrylate (BEM) with big hydrophilic and hydrophobic groups simultaneously as functional monomer. Subsequently, the self-matting coating was obtained from the acrylic latex. When the amount of BEM is controlled at 15% (based on the total mass of main monomers of St, BA and MMA), the effects of emulsifier kinds and dosage, and the buffer adding method on the polymerization stability and the monomer conversion were studied. When the weight ratio of emulsifiers is constant, and the buffer of NaHCO3 was all added with the initiator solution simultaneously, the influence of the BEM dosage (0%、5%、10%、15%、20%) on the glossiness and transmittance of coatings were investigated. In addition, the composition and morphology of coatings were characterized by FTIR、SEM、AFM. By using a comprehensive emulsifier system to form hydrophobic interaction between emulsifiers and BEM, and adding the buffer and initiator simultaneously, the stability of polymerization and the monomer conversion were improved while the coagulation is lower than 0.38% and the monomer conversion is higher than 98%. The self-matting performance of coatings could be enhanced due to the construction of micro-rough surface induced by the self-migration of the big alkyl groups from the inner matrix to the coating surface. When the amount of BEM is 20% (based on the total mass of main monomers), the coating has high transmittance (≥90%) and low glossiness (35.4%), indicating the balance between the matting performance and the transparency of coatings.