Abstract:Fenton process is currently recognized as one of the most effective methods for treating organic wastewater. It is very important for the development and application of efficient Fenton process by exploring the reaction mechanism. Due to the complexity of Fenton's reaction, the mechanism behind it is still not fully explained, and given this, the reaction mechanisms of homogeneous Fenton, photo-Fenton, electro-Fenton and heterogenetic Fenton in removal of organic pollutants are reviewed. The purpose of this review is to help researchers and engineers gain a comprehensive and in-depth understanding of the mechanism of Fenton reaction in different systems, thus providing theoretical support for the development of Fenton reaction. Finally, the future development of Fenton process is prospected.

Abstract:Abstract: Herein, commercial natural bovine tendon collagen (sponge-like) was employed as the raw material and processed into powder further via the cryo-grinding approach. Effects of pre-freezing duration on the molecular structure, physicochemical aptitudes and biological capabilities of the natural macromolecule were systematically probed. Results revealed that the polymer's triple-helix structure and intermolecular interactions were susceptible to the pre-freezing period. Specifically, gel electrophoresis experiment (sodium dodecyl sulfate-polyacrylamide gel electrophoresis, SDS-PAGE) and infrared spectrum (IR) unfolded that cryo-grinding within a short time, for instance, ten hours, will impose a particular influence on peptide chain structure of collagen molecules, which can be minimized after reinforced freezing for 24 h (COL24h). Circular dichroism (CD), atomic force microscope (AFM), and scanning electron microscope (SEM) confirmed collectively that the triple-helix structure of COL24h was the most intact, with a natural talent for fibrosis in vitro. More strikingly, as the solubility experiment revealed, the water solubility (4℃) of the ground ones soared with prolonged pre-freezing time; the solubility of COL24 was nearly four times larger than that of the control group (COL). In addition, thermal stability assay implied that cryo-grinding treatment also had an evident effect on the thermal enthalpy but not the denaturation temperature of the material; besides, with enhanced freezing duration, this impact was gradually reduced; rheological dissection proved that the overall viscosity of the collagen solution descended, exhibiting a better fluidity after grinding, and a cell test confirmed that COL24h had more substantial capacity to promote cell proliferation, shedding light on its potential amid medical cosmetology and regenerative medical materials.

Abstract:Cellulose has attracted the attention of researchers because of its biocompatibility, flexibility, degradability and recyclability. Conductive hydrogels based on the cellulose are novel flexible material, which has been widely used in electronic materials and biomedical applications with their good electrical conductivity, excellent self-healing properties and high mechanical properties. The research progress of cellulose-based conductive hydrogels is reviewed, with emphasis on their preparation methods, properties and applications. Finally, the challenges and future development prospects of cellulose-based conductive hydrogels are described.

Abstract:In this paper, using gelatin (Gel) and graphene (GR) as raw materials, sodium dodecyl sulfate (SDS) as surfactant, glycerol and water as binary solvent, the Gel/GR conducting hydrogel was prepared. The effects of the content of graphene on the mechanical and electrical properties of the conducting hydrogel were studied. The results showed that Gel/GR conducting hydrogel had a tensile strength of 114.63KPa, a elongation of 157.85%, and a conductivity of 6.68*10-3S/m, which was 2500 times higher than that of pure Gel hydrogel, and had good freezing resistance and adhesion. In addition, the detection of human activity (e.g. finger bending, wrist bending) by stable and repeatable electrical signals suggests potential applications for personal health monitoring.

Abstract:MnO2 is widely used in electrocatalysis, electrochemical energy storage, biomedicine, and electrochromic devices, due to its advantages of abundant resources, low cost, and excellent electrochemical performance. This review summarizes the latest advances in applying MnO2 as electrocatalysts for oxygen evolution, hydrogen evolution, nitrogen reduction, urea oxidation, carbon dioxide reduction, and alcohol oxidation. The structural characteristics and synthetic methods of MnO2 are summarized. Then, the structure-activity relationship between the crystal shape, microstructure, electronic structure, and catalytic performance is systematically analyzed, and its application in constructing high-efficient catalytic electrode materials and performance optimization strategy are also discussed. Finally, the development direction of MnO2-based catalytic electrode materials is prospected based on the existing problems.

Abstract:Biomass materials, which are derived from living organisms such as animals, plants, and microorganisms, have important characteristics such as wide source, green and safe, renewable, and biodegradable. Biomass-based hydrogels are hydrogels prepared from natural biomass macromolecules and have been widely used in pollutant adsorption, drug carriers, bioengineering and multifunctional sensing. This paper briefly introduced the characteristics of several common biomass-based hydrogels that prepared based on protein, cellulose, alginate, starch, and chitosan. Meanwhile, the latest sensing applications of biomass-based hydrogels in biology, strain, gas, humidity, and temperature were summarized. Furthermore, considering the current research status, the challenges of the future application of biomass-based hydrogels are pointed out and targeted solutions are proposed.

Abstract:The highly active ring-opening copolymerization of epoxides with γ-thiobutyrolactone (TBL) was achieved by using a three-component catalytic system consisting of chromium complex, bis(triphenylphosphine)iminium chloride and lithium tert-butoxie (_t^BuOLi). In the polymerization process, _t^{BuOLi can} effectively stabilize the negative sulfur anions at the chain ends and suppress backbiting reaction to ensure the reaction activity and molecular weight of the polymer. The copolymer structure were characterized by ₁^H NMR, ₁₃^{C NMR}, ESI-MS and FTIR. The thermal properties of the resulting poly(ester-thioether)s were investigated by DSC and TGA methods. The resultant copolymers display perfect alternating structures and amorphous forms, with glass transtion temperatures (T_g) ranging from ?53 ℃ to ?18 ℃ and the decomposition temperatures at 5% weight loss between 258 and 300 ℃, showing good thermal stability. Further oxidation of thioether units resulted in the formation of the polymers containing sulfoxide and sulfone structures, which show enhanced T_gs. Taking the copolymer of tert-butyl glycidyl ether and TBL as an example, the thioether was oxidized to sulfoxide and sulfone structure, and the T_g was increased by 49 and 60 ℃, respectively.

Abstract:Amorphous photonic crystals PDA/SiO2 (APCs) in three different colors, blue, green and red, were prepared by coating SiO2 microspheres with polydopamine (PDA) using a modified St?ber method with three particle sizes of 187, 245 and 274 nm; the amorphous photonic crystals PDA/SiO2 were introduced into polyurethane (PU) to produce the composite material PDA/SiO2/PU. The structure and properties of PDA/SiO2 and the composite PDA/SiO2/PU were characterised using FT-IR, CA, SEM, TEM, UV-Vis, DLS, and a universal testing machine. The results show that the color of the APCs depends on the particle size of the SiO2 microspheres; the color saturation of the APCs can be adjusted by adjusting the amount of PDA coating; the introduction of the APCs into the PU results in a dark red structured polyurethane with a maximum tensile strength of 40.28 MPa and a water contact angle of 113°, which gives the polyurethane structural chromogenic and excellent mechanical properties and hydrophobicity.

Abstract:The synthesis of a two-photon fluorescence probe, {6-methoxy-2-(6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)quinolin-2-yl)benzo[d]thiazole} (MQH2O2), was achieved by incorporating 6-methoxybenzothiazol-2-hydroxyquinoline as the fluorescence moiety and borate ester as the H2O2 recognition element. Through the utilization of fluorescence spectroscopy and two-photon fluorescence spectroscopy, the ability of MQH2O2 to respond to H2O2 was evaluated. The results of the assessment reveal that the probe possesses a favorable H2O2 ratio response, with a ratio signal enhancement of roughly 25.4 times within 30 minutes and a detection limit as low as 38.6 nmol/L. Furthermore, the probe exhibits proficient two-photon properties, with a maximum two-photon fluorescence active cross-section of 150 GM. Finally, two-photon confocal imaging was utilized to conduct cell and brain tissue imaging, which demonstrated that the probe is capable of accomplishing in situ imaging analysis of oxidative stress caused by stroke.

Abstract:A series of polyarylates PAR-Pn(n is 0.05%, 0.10%, 0.15% and 0.20% respectively, indicating the content of 3,9-perylene diacyl chloride, calculated based on the mount of bisphenol A, the same below) with varied ratios of perylene unit were synthesized by means of interfacial condensation of perylene-3,9-dichloride, bisphenol A, isophthalic chloride and terephthaloyl chloride. The thermal stability and optical properties of the polyarylates were characterized by DSC, TGA, DMA, UV-vis and PL. The initial thermal decomposition temperatures and the glass transition temperatures of the polyarylates are above 468 ℃ and 211 ℃, respectively, which implies the polyarylates have high thermal stability. Furthermore, all the polyarylates have photoluminescent characteristics with photoluminescent peaks at 480~540 nm. The fluorescence intensity increases with the increase of perylene ratio. In addition, the polyarylates have good solubility in common organic reagents, which provides the possibility of wet preparation of polymer films.

Abstract:Cellulose-based extraction material (Cell-COOH) was prepared from cellulose using acid anhydride modification for the enrichment of amphetamine in urine, and a solid-phase extraction coupled with high performance liquid chromatography based on Cell-COOH was established for the determination of amphetamine drugs in urine. The structure of Cell-COOH was characterized by modern analytical methods. Solid-phase extraction conditions were also optimized. Specificity, interference resistance and reusability of Cell-COOH were tested, and the feasibility of the method was verified. The results showed that the surface of Cell-COOH contained carboxyl functional group, showing good adsorption to amphetamine. The method showed good specificity and anti-interference ability under the interference of other abused drugs and urine co-existing ions, and the extraction efficiency could remain above 92% after seven cycles of use. Under the optimal extraction conditions, the linear range of the method was among 0.01~2 mg/L (R2=0.9973%), and the limit of detection was 2.5 μg/L with the quantification limit of 8 μg/L. The recovery rate of amphetamine could reach 74.41~82.14% when using Cell-COOH as solid phase extractant in actual urine, and the relative deviation at the 3 spiked levels was 2.32~6.85%.

Abstract:In this paper, amphiphilic snowman-like Janus particles and cobalt phthalocyanine catalyst were prepared, and the cobalt phthalocyanine catalyst was successfully loaded on the hydrophilic side of Janus particles selectively. The asymmetric structure of the particles with obvious partition was observed by SEM, and the components of the particles were further determined by XPS, EDS, FT-IR, TG, ect. The cobalt phthalocyanine modified amphiphilic Janus particles were applied as both solid particle emulsifier and interfacial catalyst for the photocatalytic degradation of water-soluble dye rhodamine B in a multiphase system. The factors of ventilation and light, catalyst dosage, initial concentration of dye and volume fraction of H₂O₂ influence the catalytic effect were investigated. The degradation rate of the dye was observed by UV-vis spectrophotometer. The results showed that the catalytic degradation rate of the Janus catalyst was up to 85.6%, showing a significant catalytic advantage over the pre-load catalyst. The catalyst was easily recovered for reuse, and maintained good catalytic efficiency for five cycles.

Abstract:Bacillus and its extracellular metabolites are used in skin care products due to their antioxidant and antibacterial properties. The active substances were extracted from the fermentation product of Bacillus ZYCHH-01 by hydrochloric acid precipitation method, and the in vitro antioxidant activity of the extract was evaluated by using the free radical scavenging rate as an index, the antibacterial ability of the extract was assessed by Oxford Cup diffusion test, and the biosafety of the extract-added cream was examined by acute skin irritation and human application tests. The results showed that the extract exhibited some scavenging activity against DPPH- and ABTS+- with semi-clearance (IC50) of 0.73 and 0.26 g/L, respectively. The extract inhibited both Gram-positive and negative bacteria and could cause severe damage to the bacterial morphology. In the Chinese cosmetic industry, the maximum amount of single nipagin ester used is 0.4wt%, and the maximum amount of mixed ester used is 0.8wt% of the overall. When the mass concentration of the extract is 8 g/L (0.8wt%), it can effectively inhibit the growth of six common pathogenic bacteria and has the feasibility of replacing commercially available preservatives; and the prepared cream has safety and no skin irritation.

Abstract:The magnetic Fe3O4 was used as the carrier, and the magnetic cross-linked scPLD aggregates (MCLEA) were prepared by adsorption-aggregation-crosslinking. The enzyme activity recovery of the MCLEA was 72.89%, and the enzyme activity was 437±6.60 U/g. Compared to free scPLD, the MCLEA showed better tolerance at different temperatures and pH levels. However, due to the reduced affinity of the MCLLEA with the substrate, it requires higher concentrations of phosphatidylcholine (PC) and Ca2+ as the reaction substrate to bind to MCLEA. Furthermore, the organic solvent tolerance of the MCLEA was also investigated, and organic solvents such as ethanol, tetrahydrofuran, tert-butanol, ethyl acetate, ether, and toluene were found to improve the enzymatic reactions of MCLEA. These findings provide a reference for the selection of organic solvents in the construction of a biphasic system in the production of phosphatidylserine (PS) catalyzed by scPLD. After 13 cycles of continuous reaction, the activity of the MCLEA remained above 76%, giving a half-life of 331.67 min, which indicated that the immobilizing method developed in this work could improve the stability of the PLD and its reusability in the catalytic reaction.

Abstract:To improve β-mannanase activity, the molecular evolution of β-mannanase gene from Bacillus licheniformis KD-1 was carried out by error-prone PCR. The mutated genes were expressed in B. subtilis to directed screen the mutants with higher β-mannanase activity than the wildtype. Among mutants, the specific activity of β-mannanase ManBl (I91N/L211I) was 15554.7 U/mg, which was 4.2 times of the wild-type ManBl. The extracellular yield of ManBl (I91N/L211I) expressed in B. subtilis at food-grade level reached 17601.3 U/mL. The β-mannanase structure predicted by AlphaFold2 demonstrates that the two loci (I91N and L211I), which are not the β-mannanase catalytic center, influence the enzyme activity at a great degree. Furthermore, the β-mannanase ManBl (I91N/L211I) can hydrolyze konjac glucomannan (KGM) into mannooligosaccharides (MOS) with different degree of polymerization (DP), which were mainly composed of mannohexaose, mannotriose, and mannobiose. This is the first report that the combined mutation of I91N/L211I can increase β-mannanase activity. The food-grade expression of ManBl (I91N/L211I) opens up a way to its application with biosafety.

Abstract:In this study, Bacillus subtilis was used as the host to express the heterologous enzyme for biotechnological production of 2’-deoxyadenosine. The pyrimidine nucleoside phosphorylase (PyNP) and purine nucleoside phosphorylase (PNP) from Escherichia coli as biocatalyst to convert thymidine and adenine into 2’-deoxyadenosine with high efficiency. Firstly, the enzyme combination expression and ribosome binding site (RBS) optimization of nucleoside phosphorylases were performed, and the recombinant B. subtilis that synthesized 2’-deoxyadenosine by whole-cell catalysis was constructed. The yield of 2’-deoxyadenosine was 133.4 g/L, and the molar conversion rate of thymidine was 64.3%. Then, to further improve the yield and molar conversion rate, a short peptide pair was used to form self-assembling multienzyme complexes in vivo. The yield of 2’-deoxyadenosine was significantly improved, reaching to 179.6 g/L. Finally, the conditions of whole-cell catalysis were optimized to further improve the production of 2’-deoxyadenosine. The optimized production of 2’-deoxyadenosine reached to 200.3 g/L and the molar conversion rate of substrate thymidine was 96.6%.

Abstract:Carbon tetrachloride (CCl4)-induced acute liver injury (ALI) rat model was used to evaluate the effects of PSPJ on liver histopathological changes by observing the general condition and body weight changes of rats, and the improvement of liver histopathological changes by hematoxylin-eosin staining (HE); the effects of PSPJ on liver histopathological changes were evaluated by observing the general condition and body weight changes of rats, and the improvement of liver histopathological changes by hematoxylin-eosin staining (HE). PSPJ) were administered to rats, and the ameliorative effect of PSPJ on the pathological changes of liver tissue was evaluated by observing the general condition and body weight changes of rats, using hematoxylin-eosin staining (HE); immunohistochemistry (IHC) staining to detect the expression of NF-κB in liver tissues; and protein immunoblotting (WB) and other methods to detect the effect of PSPJ on hepatic PI3K/AKT/ NF-κBR signaling pathway-related proteins and expression levels of inflammatory indicators. The results showed that the body weight, liver weight and liver index of the model group increased significantly (P<0.05); a large amount of inflammatory infiltration of liver tissue appeared in the model group, and the pathological changes of the liver in the drug group were obviously alleviated; compared with the normal group, p-PI3K protein expression in the liver tissue of the model group decreased significantly (P<0.05), and the expression of P I3K, p-AKT, p-NF-κB and IL-1β protein increased significantly (P<0.05); in the drug group, the expression of p-PI3K protein increased significantly (P<0.05), and that of p-AKT and IL-1β decreased significantly (P<0.05). In the drug group, p-PI3K protein expression was significantly increased (P<0.05), and p-AKT and IL-1β protein expression was significantly decreased (P<0.05). pSPJ could alleviate CCL4-induced acute liver injury through the expression of key proteins in the signaling of PI3K/AKT/NF-κB pathway in rats.

Abstract:Mesoporous ZSM-5zeolite was synthesized by a two-step process using industrial waste silica fume as raw material and starch as template agent. The crystalline shape, morphology, pore structure and acidic characteristics of the catalyst were characterized by XRD, SEM, N2 adsorption and desorption as well as NH3-TPD. It is found that the relative crystallinity of the synthesized molecular sieve is 73.4%, and the microscopic morphology is a columnar grain with a long axis of about 3 μm, which has a pore size distribution between 3 ~ 5 nm and a total acid content of 1.15 mmol/g. The catalysts were further used for the co-cracking of low density polyethylene (LDPE) and lignin (AL). The results show that when co-cracking LDPE and AL (1:1 mass ratio), the BTEX selectivity is 91.86%, which is higher than that of CZ (86.31%), and also higher than that of caracking LDPE and AL alone. Moreover, the BTEX yield obtained during co-cracking (22.94%) was also significantly higher than the theoretical yield of BTEX (19.79%), indicating a synergistic effect between the two feedstocks in the catalytic co-cracking process to improve BTEX production.

Abstract:3-Thiazoline is a kind of heterocycle flavor compound containing sulfur and nitrogen. Six 4-methyl-3-thiazoline flavor compounds, including 4-methyl-3-thiazoline, 2,4-dimethyl-3- thiazoline, 2-ethyl-4-methyl-3-thiazoline, 2-isopropyl-4- methyl-3-thiazoline, 2- propyl-4- methyl-3-thiazoline and 2- butyl-4- methyl-3-thiazoline, were synthesized by applying fatty aldehydes, 2,5-dimethyl-2,5-dihydroxy-1,4-dithiane and aqueous ammonia as the raw materials and water or ethanol as solvent in this paper; their yields were 50%-91%. Six compounds were identified by mass spectra, 1H NMR and 13C NMR, followed by evaluating their odor characteristics and measuring their retention indices (RI) on two capillary columns with different polarities. The results indicated that six odorants had roast, nutty and burnt odor, and the RI ranges on HP-INNOWAX column and HP-5MS column were 1398-1686 and 938-1253, respectively. The results obtained had important referenceSvalueSforSmanufacturing, applying and identifying 4-methyl-3-thiazoline flavor compounds.

Abstract:Abstract: Twenty-five N "-phenylmethylene-2-(3-pyridyl) quinoline-4-hydrazide derivatives (yield: 20.4- 42.6%) were designed and synthesized based on bioelectronic isosteric principle with STX-0119 as the lead compound，and the product structure was confirmed by 1H NMR，MS，13C NMR. The in vitro antitumor activity of the target compounds was evaluated using the MTT assay and the Trypan Blue assay. Human breast cancer cell line MCF-7 cells，human lung cancer cell line A549 cells，human chronic myelogenous leukemia cell line K562 cells，and human acute B-lymphoblastic leukemia cell line RS4:11 cells were used as test cell lines. Target compound Ⅶr exhibited the strongest cell proliferation inhibitory activity against A549 cells with IC50 = 7.42 ± 0.83 μmol/L，target compound Ⅶq showed the strongest cell proliferation activity against RS4:11 cells with IC50 = 2.4 ± 0.17 μmol/L，target compound Ⅶl not only exhibited the strongest proliferation activity against MCF-7 cells (IC50 = 4.91 ± 0.33 μmol/L) but also showed the strongest proliferation activity against K562 cells (IC50 = 1.24 ± 0.19 μmol/L)，molecular docking results indicate that its anti-tumor effect may be related to the STAT3 pathway，which deserves further in-depth research.

Abstract:Based on the principle of molecular hybridization, fifteen sulfonamide derivatives containing amino acid moiety were designed and synthesized to evaluate their antibacterial activities. First, benzenesulfonyl amino acid(intermediate I) was synthesized by the reaction of benzenesulfonyl chloride with amino acids. Then, α-aminophosphonate (intermediate II) was prepared from aromatic aldehyde, phosphite, ammonium acetate and Al(OTf)3 in one pot method. Finally, intermediate I and II were condensed to obtain the target products, and their structures were confirmed by 1H-NMR, 13C-NMR and MS. The results showed that these compounds had the most significant activities against E. coli and FREC. Among them, the MIC of Ⅲb, Ⅲc, Ⅲh and Ⅲm to E. coli was 16 μg/mL, and the MIC of Ⅲn against E. coli was 8 μg/mL, which was not lower than that of the control drug Oxacillin. The MIC of Ⅲb, Ⅲh, Ⅲm and Ⅲn against FREC were 32, 32, 32 and 16 μg/mL, respectively, which were superior to the control drugs Oxacillin and Norfloxacin.

Abstract:Using ε-caprolactone (ε-CL) as hydrophobic material and poly(ethylene glycol) methyl ether methacrylate (PEGMA) as hydrophilic material, L-Lactide (LLA) was introduced as a hydrophilic and hydrophobic transition material, poly(ethylene glycol) methyl ether methacrylate-b-poly(L-lactide)-b-poly(ε-caprolactone)(PEGMA-b-PLLA-b-PCL) was prepared by Reversible Addition-Fragmentation Chain Transfer (RAFT) method with ultra-low critical micellar concentration (CMC). The structure, relative molecular weight (molecular weight) and particle size of the polymer were characterized by FTIR, 1HNMR, GPC, DLS and SEM. CMC was measured by interstitial-tension method, curcumin was loaded by solvent volatilization method, and the drug loading and encapsulation rate of the micelles were calculated by curcumin UV standard curve. Then, the drug release ability of drug-carrying micelles in different environments was further investigated. The results showed that the molecular weight of PEGMA-b-PLLA-b-PCL ranges from 1220 to 8782, the particle size ranges from 28 to 180 nm, and the lowest CMC is 0.62 μg/mL (pH=7.4). The drug loading and encapsulation rate of the micelle were high, reaching 12.6% and 78.0% (pH=7.4), and the drug release could be completed within 15 days. The maximum drug release was 45.53% at pH=5.

Abstract:PEI-SBC/Mt composite spheres were prepared by simple coagulation bath method using bagasse cellulose (SBC) and montmorillonite (Mt) as raw materials and calcium carbonate as porogenic agent. The structures of the prepared spherical adsorbents were characterized by FTIR, SEM and XRD, and the adsorption behaviors of the adsorbents on cadmium ion Cd(II) in simulated wastewater were systematically investigated. The results showed that the proposed secondary kinetic model and Langmuir model could accurately describe the adsorption process, and the maximum adsorption amount of Cd(II) by PEI-SBC/Mt at the temperature of 25 ℃, pH=6 and the initial mass concentration of Cd(II) was 600 mg/L , indicating that the adsorption process was single-molecule chemisorption, and the addition of PEI provided a more efficient way for the adsorbent to adsorb Cd The addition of PEI provided more active sites for the adsorbent to adsorb Cd(II). In addition, the adsorbent was reusable and its adsorption capacity only decreased from the original 94% to 79.8% after five cycles of adsorption and desorption.

Abstract:layered bimetallic oxides (CuAl LDO) with different molar ratios of Cu: Al were prepared by simple coprecipitation method in this study, which were used to activate persulfate (PMS) to degrade rhodamine B (RhB).The effects of catalyst dosage, PMS dosage, pH value, RhB mass concentration, temperature and inorganic ions on RhB degradation were studied. The properties of the samples were further characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and other technical means.The results showed that under the conditions of adding 30 mg/L CuAl 2:1-LDO and PMS, reaction temperature of 25 ℃, pH=5.61, and RhB mass concentration of 100 mg/L, the RhB degradation rate within 30 min was 97.1%.At the same time, the degradation rate of RhB in CuAl 2:1-LDO/PMS reaction system is more than 90% in the wide range of pH 3.00-11.00, and the degradation rate is still 71% in the fourth cycle experiment.Secondly, the results of electron paramagnetic resonance (EPR) and quenching experiments show that a lot of sulfate radical (SO4-·) and hydroxyl radical (·OH) are produced in CuAl 2:1-LDO/PMS system, in which ·OH plays a leading role in the degradation of RhB, Among them, ·OH plays a leading role in the degradation of RhB, attacking aromatic hydrocarbon ring to decolorize dyes.

Abstract:A series of polymers with different monomer ratios were synthesized by using methyl methacrylate (MMA), 2-hydroxyethyl methacrylate (HEMA), stearyl methacrylates (SMA), 3-(acryloyloxy)propyltrimethoxysilane (AC-76) and 2-(perfluorooctyl)ethyl methacrylate (FOEMA) and used to construct weather resistant self-cleaning coatings. The molecular structure of the polymers were characterized by FTIR and 1H NMR. The effect of mass fraction of FOEMA and SMA on the transmittance and hydrophobicity of the coating was studied by a spectrophotometer and a contact angle meter. When the mass fraction of SMA was 10% and the mass fraction of FOEMA was 15% (based on the total mass of the reaction system, the same below), the prepared coating P3 had the maximum transmittance and water contact angle, which were 98.6% and 105.3°, respectively. The results of artificial accelerated aging experiments show that the coating P3 has excellent weather resistance. After 5000 h of accelerated aging, the gloss retention and hydrophobicity of the coating changed little. The results of the drop slip and graffiti experiments show that the coating P3 has excellent antifouling and self-cleaning effects. The friction test results show that the contact angle of the coating P3 is still greater than 95° after 100 times of friction under 900 g pressure, indicating that it has excellent mechanical stability. Finally, the coating was sprayed on the high-speed railway carriage, which has a significant self-cleaning effect on the actual pollutants on the exterior body of the carriage.