Abstract:A series of pitch-based Hyper cross-polymers (HCPs) were synthesized via the Friedel-Crafts alkylation reaction using pitch as material and dichloromethane (DCM) as solvent and external crosslinkers in the presence of AlCl3 (different products HCP-1, HCP-2, HCP-3, HCP-4 and HCP-5 were prepared by changing the amount of cross-linking agent). The prepared HCPs were characterized by FTIR, N2 adsorption-desorption, SEM and TGA. The results showed that DCM was successfully cross-linked with pitch, the highest specific surface area of HCPs is 467m2/g and its pore structure is mainly mesoporous. The HCPs have high thermal stability. The static adsorption results indicated that HCPs show better adsorption capacities for VOCs containing aromatic rings, esters and alcohols, the adsorption capacity of o-xylene is 437.89mg/g, and the adsorption capacity of methanol is 190.48mg/g. After five cycles of adsorption of o-xylene, the adsorption capacity of HCP-4 reached 91.51% of the first adsorption amount. HCP-4 is a promising candidate for the adsorption of aromatic ring-containing VOCs.

Abstract:Halahatang oilfield is characterized by high temperature and high salinity, and the application of conventional profile control agent is difficult. By improving the properties of oil-bearing sludge and selecting and matching polyacrylamide gel system, the oil-bearing sludge gel system with temperature and salt resistance is studied, which can be used for profile control and water plugging of high-temperature and high-salt oil reservoirs.The optimized formula composition (mass fraction) was as follows: 20% oil sludge+0.8% high temperature resistant polyacrylamide NWX-1+0.2% phenolic resin +5% modified polymer monomer (AMPS)+0.01% initiator potassium persulfate + 0.5% enhancer montmorillonite. The microstructure, rheology and breakthrough pressure of the system were evaluated. The results show that the gelation time of the system is controllable. The microstructure shows a dense three-dimensional network structure with higher strength. The viscoelastic modulus of the system can be improved effectively by compounding the reinforcing agent, and the system can recover after creep. The breakthrough pressure can reach 3240 kPa/m.

Abstract:Wood tar is the pyrolysis product of woody biomass materials. In this study, wood tar was used as carbon source and wood tar treated by formaldehyde was used as precursor to prepare activated carbon by carbonization and activation. The adsorption of methylene blue in the simulated water was investigated by using wood tar based activated carbon as adsorbent. The results show that the porous activated carbon prepared by carbonization and activation at high temperature with wood tar as precursor has a specific surface area of 1373 m2?g-1 and rich oxygen-containing functional groups on the surface ,the quasi-second-order kinetic model more accurately described the adsorption kinetics of methylene blue on activated carbon derived from wood tar, and the adsorption isotherms of methylene blue on activated carbon derived from wood tar are more consistent with Langmuir adsorption isotherm model. The maximum adsorption capacity of methylene blue on activated carbon derived from wood tar was 559 mg?g-1. Thermodynamic analysis shows that the adsorption of methylene blue on activated carbon is exothermic and spontaneous. The activated carbon prepared from wood tar has potential application prospect with the excellent adsorption capacity for methylene blue.

Abstract:Silver-doped C3N4 supports (Ag-C3N4) were prepared by high temperature calcination of melamine pre-modified by silver nitrate, and then a Pd-based supporting catalyst was prepared based on this catalyst supports. The catalyst showed good catalytic activity in the catalytic dehydrogenation of formic acid. The crystal phase structure and microstructure of the catalyst were characterized by XRD, TEM, Mapping and XPS. The results show that Ag species can be doped into the bulk of C3N4 to obtain an Ag-containing C3N4 supports by calcining melamine pre-modified by silver nitrate at high temperature. It can be found that the introduction of Ag species can modulate the crystal phase structure and microstructure of C3N4. And the Pd-base catalysts supported onto our supports showed a good catalytic activity in the hydrogen reaction of formic acid decomposition. The catalyst activity test showed that the TOF of the optimized Ag3%-C3N4-Pd catalyst sample could reach 991h-1 at 323K, which is obviously higher than the Pd-based catalyst supported on C3N4 without any modification. The premodification of melamine with silver nitrate is helpful to obtain good catalyst support and to prepare high performance catalyst.

Abstract:In order to solve the problem of poor fatigue resistance of spiropyran organic photochromic material in practical application, the spiropyran photochromic material is used as the core material and polystyrene as the shell material to prepare spiropyran photochromic microcapsule by solvent evaporation method. And the photochromic microcapsules are printed on the fabric to obtain the photochromic fabric. The results show that the microcapsules are completely coated, the surface is smooth, the average particle size measured by the particle size analyzer reaches 700 nm, and the particle size distribution is relatively dispersed. The photochromic microcapsules have good discoloration performance. It can change from white to purple in 20 s under ultraviolet light irradiation, and can return to the initial state in 8 minutes in a dark environment. The color difference ΔECMC of the printed fabrics with photochromic microcapsules before and after discoloration reaches 36.10, and it still has good discoloration sensitivity after 20 cycles of UV-visible light irradiation. Therefore, the obtained photochromic microcapsules have good application potential in fields such as smart textile materials.

Abstract:Aiming at the problem that the oil well cement sheath is easily corroded by CO2 in the high temperature environment of the formation, a water-based epoxy resin WEP was prepared using sodium styrene sulfonate and epoxy resin E54 as raw materials. FTIR results showed that the modified product was the target product. The centrifugal test showed that the WEP emulsion could be stabilized at 6000 rpm for 30 min, and the microscope was magnified 150 times to observe that the WEP emulsion was uniformly dispersed and the particles were small, indicating that the WEP had good self-emulsifying properties. Thermogravimetric analysis showed that the decomposition temperature of WEP was 295 ℃, and the thermal stability was good. The high temperature corrosion test results show that the compressive strength decline rate of the contrast cement stone after 90 d corrosion is 62.0%, and the compressive strength decline rate of the WEP modified cement stone is only 14.7%. The thermogravimetric analysis of the cement stone shows that the CaCO3 content in the contrast cement stone is about 4.02%, while the CaCO3 content in the WEP-modified cement stone is only 0.25%. The XRD spectrum of the cement stone after corrosion shows that the characteristic peaks of some hydration products in the contrast cement stone have disappeared, and a large number of characteristic peaks of CaCO3 appear. The main components of the WEP-modified cement stone are still C-S-H and other cement hydration products. The SEM results show that WEP forms a polymer film in the cement stone, wraps the hydration product, reduces the contact between the hydration product and CO2, and improves the CO2 corrosion resistance of the cement stone.

Abstract:Integrated CO2 capture and conversion (ICCC) represents a key negative emission technology to achieve carbon neutrality, and the construction of dual function materials (DFMs) with high CO2 uptakes and catalytic activity is essential. In this work, cylindrical, spherical and flake Ni-CaO DFMs were synthesized by the extrusion, extrusion-spherization and squashing methods, respectively, and effect of granulation on the structure and ICCC performance of Ni-CaO DFMs was investigated. Results indicated that granulation adversely affected the CO2 bulk diffusion and adsorption since it would destroy the porous structures of DFMs. The Ni-CaO-P exhibited a high CO2 uptake of 14.28 mmol CO2/g in 650°C and 10%CO2, and a high CO yield of 5.63 mmol CO/g in reverse water-gas shift (RWGS) reaction in 5%H2. Compared to the powdered DFMs, CO2 adsorption capacities of the Ni-CaO DFMs pellets decreased significantly to 7.28~9.78 mmol CO2/g, while the catalytic conversion rate of CO2 has been significantly improved. Granulation played an important role in stabilizing the CO2 uptakes of the Ni-CaO DFMs pellets in multiple cycles. The Ni-CaO-P exhibited a high loss-in-capacity of 31.37% for CO2 capture within 12 cycles, while the loss-in-capacity of the DFMs pellets was lower (9.36~24.23%).

Abstract:To improve the accuracy of bisphenol A (BPA) detection in aqueous solution, a two-step method was used to prepare amine functionalized Poly N-vinylpyrrolidone-divinylbenzene 〔P(NVP-DVB)〕 adsorbents. The samples were characterized by SEM, FTIR, BET, TGA, and water contact angle test.in the two-step reaction and the amine functionalized N-vinylpyrrolidone-divinylbenzene was applied to the detection of BPA in aqueous solution. The optimal conditions for the chloromethylation reaction were obtained through optimization experiments: we used paraformaldehyde 〔(CH2O)n〕and hydrochloric acid as the chlorination reagents and finally synthesized intermediates 〔P(NVP-DVB-CH2Cl)〕with chlorine content up to 11.14% under the condition of n(HCl): n〔(CH2O)n〕: n(catalyst)=1:1:1, here we used ZnCl2 as the catalyst, the reaction temperature is 80℃, the chlorination time is 3 h; aniline as amination reagent was grafted to P(NVP-DVB-CH2Cl) intermediates to obtain P(NVP-DVB-aniline), the average pore size was 8.59 nm,the specific surface area was 590.36 m2/g, and the thermal weight loss rate of aniline was 81.11%. The recovery effect rate of BPA in aqueous solution was highest for the P(NVP-DVB-aniline), and the recovery rate was 99.65%, and the relative standard deviation was 1.96%, and the apply effect was better in both simulated and actual aqueous samples, and the recovery rate was nearly 20 percentage points higher than that of commercial adsorbents, and the adsorption effect of BPA in aqueous solution was better.

Abstract:First, 4,4-biphenol diglycidyl ether (DGEBP) with high epoxy value and high crystallinity was prepared by one-step precipitation reaction of 4,4-biphenol (BP) and epichlorohydrin (ECH). The structure of DGEBP was confirmed by FTIR and NMR, and the optimum process conditions were determined successively. POM and XRD measurements verified that DGEBP was a solid powdered epoxy resin with high crystallinity and did not have liquid crystal behavior. Six curing agents were selected to cure DGEBP, respectively, to form crosslinked networks, and all the as-prepared cured products had good thermal properties. And then, DGEBP was used to modify bisphenol-A epoxy resin/polyoxyphenol (PKHH) binary blend resin system with dicyandiamide (DICY) as the hardener to obtain multiple modified ones (BPx-BA-PKHH). DMA and mechanical property analysis showed that DGEBP unit in the cured networks exhibiteds liquid crystallinity, and mesogenic domains appeared. At the same time, the tensile strength (87.39 MPa), Modulus (2.76GPa), shear strength (19.38 MPa) and toughness of BPx-BA-PKHH were significantly improved. And, the best comprehensive performance was obtained at the addition amount of DGEBP by 5-7 phr.

Abstract:To cope with the environmental crisis of global warming caused by excessive CO_2 emissions, China has proposed the strategic goal of carbon dioxide emissions peak and carbon neutrality. And CO_2 capture technology is becoming a research hotspot. This paper focuses on the liquid-phase chemical capture (solvent absorption) technology, and the latest research progress of carbon dioxide adsorbents including alcohol-amine absorbent, potassium carbonate absorbent, ammonia absorbent, ionic liquid absorbent, and phase change absorbent is mainly introduced. Moreover, the chemical reaction mechanism, the advantages and disadvantages of various adsorbents are reviewed. Finally, the direction of improvement and the challenges faced at present are also discussed, and the future development of the chemical absorbents is presented.

Abstract:Interference and confusion between electromagnetic signals have become the primary challenge in the era of 5G wireless communication, and the development of high-performance electromagnetic shielding materials that effectively shield high and low frequency electromagnetic interference has become a hot topic in current research. In the future, electromagnetic shielding materials will develop towards ultra-thin, flexible, lightweight, broadband efficient absorption, high temperature resistance, and good mechanical properties. Polyimide (PI) is used as the matrix material of many advanced electromagnetic shielding composites because of its good mechanical properties, good thermal stability, light weight, and flexibility. Therefore, this paper introduces the shielding mechanism of PI electromagnetic shielding materials and summarizes the influencing factors and research progress of their shielding performance. Finally, the future development trend of high-performance PI electromagnetic shielding materials is described to provide reference for the subsequent research of PI electromagnetic shielding materials.

Abstract:In order to improve the performance of microbial fuel cell (MFC), PVA/PWA and PVA/OPD modified membranes were prepared by solution impregnation with polyvinyl alcohol (PVA) as adhesive and phosphotungstic acid (PWA) and o-phenylenediamine (OPD) as modifier respectively, and the modified membranes were mounted on MFC system. The membrane properties were characterized by SEM, EIS, CV and water absorption, the effects of membrane modification on the output power and the removal rate of chemical oxygen demand (COD) of MFC were investigated. Results showed that both PVA/PWA and PVA/OPD modified membranes could improve the performance of MFC to a certain extent, but PVA/OPD modified membrane presented a better effect. The water absorption of PVA/OPD modified membrane was about 14.49%, which was 122.9% higher than that of the conventional Nafion membrane (NF). The output energy of MFC with PVA/OPD modified membrane in the test cycle was 101.75 J, which was 587.5% higher than that of MFC with NF; the COD removal rate of amoxicillin pharmaceutical wastewater was 66.2%, which was 48.7% higher than that of MFC with NF. The membrane modification method based on PVA/OPD has a significant effect on improving the power generation performance and wastewater treatment efficiency of MFCs.

Abstract:A fluorescent probe (ED) was designed and synthesized using caffeic acid to detect N2H4 rapidly. Its structure was characterized by 1H NMR, 13C NMR, and HRMS. It was found that the probe ED had high selection and high sensitivity recognition of N2H4 by fluorescence spectroscopy, and the detection limit during the detection process was 0.31 μmol/L, the optimal pH value range was 3~8, and the response time was 48 s. MS and 1H NMR proved that the unsaturated ketone in the probe structure reacted with N2H4 to form pyrazole ring in the fluorescence response of probe to N2H4. In addition, after the probe ED interacts with N2H4, the color of the solution changes from colorless to yellow, which can realize the "naked eye detection" of N2H4. Probe ED was successfully used for the detection of N2H4 in actual water samples.

Abstract:In order to improve the resource utilization rate of chestnut waste, chestnut burs was used as raw material to explore the extraction process of the active ingredient for inhibiting Shigella dysenteriae. In this experiment, absorbance spectrophotometry was used to compare the antibacterial activity of different solvent extract of chestnut burs. The extraction process was optimized by single factor experiment combined with response surface methodology when antibacterial rate was used as response value and ethanol water was used as solvent. The minimum inhibitory concentration (MIC)of extracts from Chestnut burs were determined by double dilution method, and extracts on bacterial growth curve were compared by absorbance spectrophotometry. The results demonstrated that the ethanol water extract of Chestnut burs had the best antibacterial activity against Shigella dysenteriae. The optimal extraction process was as follow: 45% ethanol as solvent, the ratio of material to liquid was 1:20 (g:mL), extraction temperature 50 ℃; Under the optimal conditions, the antibacterial activity and MIC value of extract from Chestnut burs was 3.2mg /mL, at 0.5 mg/mL The antibacterial rate of extract was 61.27%. The MIC value of ethyl acetate phase extract was 0.4 mg/mL, and the antibacterial rate was 85%, indicating that ethyl acetate phase extract had strong antibacterial activity and was a natural antibacterial agent with great potential for development.

Abstract:Using lignosterol and oleic acid as raw materials and Candida rugosa lipase covalently immobilized on magnetic chitosan nanocomposites as catalyst, the conditions for enzymatic synthesis of lignosterol oleate were systematically optimized. Under the optimized conditions of catalyst dosage 12.7% (based on the total mass of substrates), substrate concentration of lignosterol 121.5 g/L, molar ratio of oleic acid to lignosterol 2:1, reaction temperature 50°C, reaction time 24 h, the conversion rate of lignosterol could reach 96.42%. For lauric acid, myristic acid, palmitic acid and mixed fatty acids composed of fatty acids with different chain lengths, the conversion rate of lignosterol could still be as high as 96.67%~98.74%. The immobilized biocatalyst showed good reusability. After being reused for 5 times, the conversion rate of lignosterol could still be obtained in 82.45%.

Abstract:In order to explore the wider applicability of microbial fuel cells, aerobic granular sludge (AGS) was coupled with microbial fuel cells (MFC) in this experiment, and the sequencing batch operation was adopted, the influent COD was fixed at 780 mg/L, and the C/N ratio was adjusted to 5, 10, 15, 20 by changing the concentration of NH4+ (39, 50, 78 and 156 mg/L), respectively. The influence of different C/N on microbial diversity and community structure in the cathode chamber of the system was studied. High-throughput sequencing analysis showed that the relative abundance of different bacterial communities in the cathode chamber changed significantly with the change of influent C/N. At the phylum level, the relative abundance of Proteobacteria was 45% when C/N=10. When C/N=20, it decreases to 41.1%. At class level, Deinococci with the largest variation in relative abundance can account for 27.2% at C/N=5, and only 15.1% at C/N=20. Under the conditions of C/N=15 and 20, the metabolic relative abundance of microorganisms in the cathode chamber was the highest (77.1%), and the corresponding metabolic strength of the cathode aerobic granular sludge was strong, which played an important role in the microbial degradation of COD.

Abstract:The objective of this work was to investigate the effects of different fulvic acid (FA) concentrations on eicosapentaenoic acid (EPA) accumulation in Phaeodactylum tricornutum. The results showed that 20 mg/L FA treatment induced the highest EPA content and EPA productivity by 19.81 g/100 g and 738.91 mg/L, represented 2.01- and 2.54-fold more than that without FA treatment group. The exogenous FA treatment intensified activities of POD, SOD, and CAT in P. tricornutum to enhance the proportions of pigments and polyphenol simultaneously decrease the levels of ROS and MDA. This indicated that the antioxidative capacities of P. tricornutum cells were significantly improved consequently inhibited oxidative decomposition of EPA. FA treatment also caused up-regulations of Δ5-FADS、Δ6-FADS、Δ12-FADS、Δ6-ELOVL、Δ15-FADS、Δ17-FADS involved in EPA pathway resulting in 1.27-, 1.81-, 1.24-, 1.45-, 1.43- and 1.46-fold increments than that without FA treatment group. The enhancement of these crucial enzymes in EPA pathway would provide a majority of precursors and energy for efficient EPA synthesis. Consequently, EPA accumulation in P. tricornutum-treated with FA attributed to inhibition of oxidative decomposition of EPA and supplementations of precursors/energy.

Abstract:Core-shell structure nanocomposite, namely a layer or multilayer of inorganic or organic materials are coated on the outer surface of inorganic or organic particles with a certain interaction force to form a composite nanomaterial with core-shell structure. Core-shell nanocomposites can improve the deficiencies of the outer core and inner shell and improve the optical, electrical, magnetic, catalytic and other properties of the material. According to the difference of core and shell layer, it can be divided into various categories, and there are various preparation methods. The interaction between core and shell makes core-shell nanocomposites exhibit various excellent functional properties, which are widely used in many fields. In catalytic applications, core-shell nanocomposites not only exhibit good chemical resistance, but also effectively reduce the agglomeration and sintering of nanoparticles. We provide the classification, preparation methods and applications of core-shell nanocomposites in the field of catalysis, briefly expound their formation mechanism, and prospect their future development directions.

Abstract:Excess phosphorus discharged into natural water will lead to eutrophication. Adsorption method has been extensively studied due to its economy, convenience, and efficiency. Ordered porous materials are characterized by regular pores, large surface area and pore volume, which can improve the dispersion of active species, further effectively enhancing the phosphate adsorption efficiency. The recent progress in the application of sorbents based on ordered porous materials to phosphate removal from water is summarized, including ordered porous carbon materials, ordered porous silicon materials and metal organic frameworks. The phosphate adsorption performance, main adsorption mechanism, adsorption influence factor, recovery and utilization of adsorbents based on ordered porous materials are discussed. The problems of phosphate adsorption by adsorbents based on ordered porous materials are summarized, and the future research direction and application prospect are also proposed.

Abstract:A fluorescent probe NSS of benzothiazole derivatives was synthesized using 2-mercaptobenzothiazole as raw material and the structure was characterized by IR, MS, 1H NMR, 13C NMR. The fluorescence spectroscopy studies demonstrated that the probe NSS showed fast-response, high selectivity and good anti-interference ability towards Zn2+ ion through the significant fluorescence enhancement effect in the DMSO solution. The fluorescence intensity of probe NSS had a good linear relationship with the concentration of Zn2+ (0～11 μmol/L), and the detection limit could reach 19.1 nmol/L. The bingding stoichiometry of probe NSS with Zn2+ was 1:1, which was confirmed by Job's plot analysis and MS. Meanwhile, complex NSS-Zn2+ had obviously fluorescence intensity quenched response to glyphosate while suffering from a slight interference in the presence of other organophosphorus pesticides. The quenching efficiency reached a maximum of 99.4%, and the detection limit of complex NSS-Zn2+ to glyphosate was 16.0 nmol/L (2.68 ng/mL). In addition, probe NSS was succesfully used in the detection of Zn2+ and glyphosate in the actual water samples, the method had potential application in the field of environmental detection.

Abstract:Using polyvinyl alcohol (PVA), graphene oxide (GO) and silver nitrate as raw materials, a series of reduced graphene oxide (rGO) - supported nano silver / polyvinyl alcohol antibacterial hydrogels (rGO AgNPs / PVA) (PGA) with different mass fractions of AgNPs were prepared by physical crosslinking method (freezing thawing method) without adding initiator and crosslinker. The structure and morphology of the hydrogel were characterized by FTIR and SEM, and its mechanical and biological properties were tested by tensile test and biological experiment. The results showed that the addition of reduced graphene oxide enhanced the mechanical strength of polyvinyl alcohol (PVA) hydrogel, the elongation at break of rGO AgNPs / PVA antibacterial hydrogel was about 60% higher than that of PVA hydrogel, and the tensile strain could reach 125%. Rheological tests showed that the storage modulus (G') and loss modulus (G') of PVA hydrogel were lower than those of rGO AgNPs / PVA hydrogel; rGO and nano silver (AgNPS) are synergistic antibacterial. The antibacterial band widths of PGA-2, PGA-3, PGA-4 and PGA-5 against Escherichia coli and Staphylococcus aureus are 0.5~4.5 mm and 0.5~5.5 mm respectively; SEM test showed that compared with PVA hydrogel, the pores of rGO agnps/pva hydrogel increased, rGO formed network structure through π - π action, and rGO agnps/pva hydrogel showed porous interconnected microstructure.

Abstract:Polyimide is widely concerned in the field of engineering polymer materials. The development of a new type of polyimide film material with high temperature resistance and good hydrophobicity is an important breakthrough to promote the engineering application of high-performance polymer materials in electric vehicles and other high-tech fields. In this work, the composite polyimide film was synthesized by a two-step method, and the polyimide film was modified by nano-ZrO2 powder. The structure and morphology of the composite film were characterized by means of XRD, SEM, energy spectrum, infrared spectroscopy, etc. and the thermal stability, hydrophobicity and tensile strength of the composite film were tested. The results showed that the addition of nano-ZrO2 enhanced the interaction between polyimide molecular chains, and the heat resistance of polyimide was significantly improved. The decomposition temperature was increased by 20 ℃, the water contact Angle was increased by 60%, and the hydrophobicity was improved. This work provides a new idea for the development of novel high-performance polyimide polymer materials.

Abstract:Lignin was isolated from Camellia oleifera shell by lactic acid-based deep eutectic solvent (DES). The structure, thermal stability and antioxidant activity of lignin samples were investigated. The results showed that TEBAC/LA and Bet/LA DES exhibited excellent capability of solubilizing lignin from biomass. The yield of lignin was 77.87% and 59.49% after pretreatment at 120 ℃ for 5 h, respectively. UV and FTIR analyses show that the benzene ring structure of lignin remains complete and with syringl and guaiacyl units. Compared to TEBAC/LA, the lignin samples extracted by Bet/LA presented low relative molecular mass, low polydispersity index and homogeneous structure. The weight loss rate, weight loss temperature and pyrolysis product of the two lignin are different, indicating that there are significant differences in the thermal stability of different lignin. Moreover, the two lignin samples showed distinct antioxidant activity. The capability of Bet/LA sample to scavenge DPPH radical were up to 84.57%.

Abstract:For efficiently constructing functionalized β-aryl-δ-amino acid derivatives, starting from easily prepared 5-phthalimide-2-pentenoic acid methyl ester and arylboric acids as raw materials, nine kinds of 5-phthalimide-3-arylvalerate methyl ester were obtained via a [Rh(COD)Cl]2 catalyzed Michael reaction. And the yields were more than 95%. The obtained compounds were confirmed by 1HNMR, 13CNMR and HR-MS, respectively. Moreover, the optimum reaction conditions for synthesis of 5-phthalimide-3-arylvalerate methyl ester were as follows: methyl 5-phthalimide-2-pentenoate (0.2 mmol), arylboric acid (0.4 mmol), potassium hydroxide aqueous solution (0.1 mL, 1.0 mol/L), [Rh(COD)Cl]2 (0.005 mmol), 1,4-dioxane (1.0 ml) as solvent，reaction time of 10 hours，at the temperature 100℃. In addition, 5-phthalimide-3-p-chlorophenylvalerate methyl ester can be used for the rapid preparation of the active molecules of homobaclofen hydrochloride.

Abstract:When pure essential oil used as antibacterial agents, the dosage was relatively large, the aroma was monotonous and strong, and it was easy to cause sensory discomfort or allergy. In order to solve the problems, the minimum antimicrobial concentration (MIC) of 13 kinds of essential oils was determined. Meantime, the checkerboard dilution method, inhibition zone method and sensory evaluation were used to optimal combination of compound essential oils (CEOs) based on litsea cubeba. Furthermore, the antibacterial mechanism of compound essential oil against E.coli was evaluated. The results showed that litsea cubeba and cinnamon compound essential oil (V:V=2:1) with pleasant and comfortable aroma exhibited excellent synergistic antibacterial activity against E.coli and S.aureus, and the inhibition zone diameters were (21.12±0.17) mm and (40.26±0.61) mm, respectively. Compared with single litsea cubeba essential oil and cinnamon essential oil, the compound essential oils have a more obvious inhibitory effect against E. coli. Meanwhile, the relative conductivity and bacterial cellular content (140% and 20% higher than that of litsea cubeba essential oil and cinnamon essential oil) was increased significantly, which further confirmed the destruction towards bacteria membrane and the leakage of its contents.

Abstract:Fe/C microelectrolysis process has low wastewater treatment efficiency and is prone to hardening problems, and is only suitable for treating acidic wastewater. In order to broaden the application range of Fe/C microelectrolysis process and improve the treatment efficiency, Fe/Mn/C ternary microelectrolysis system was constructed by adding zerovalent Mn and methyl orange (MO) simulated dye wastewater was treated. The morphology changes of iron, manganese and carbon and the compositions of surface elements were analyzed using SEM-EDS, Fourier transform infrared spectroscopy and Raman spectra. The changes of organic compounds in the wastewater were explored using UV-Vis spectra and three-dimensional fluorescence spectra before and after the reaction. Degradation performance of methyl orange was compared between Fe/Mn/C microelectrolysis and Fe/C microelectrolysis. Reaction mechanisms and reaction kinetics of methyl orange degradation were revealed using Fe/Mn/C ternary microelectrolysis system. The results showed that iron oxides, hydroxides and manganese oxides were existed on the surface of iron, manganese and carbon after the reaction. Fe/Mn/C ternary microelectrolysis broke nitrogen-nitrogen double bond of methyl orange and destroyed the structure of benzene ring. The degradation process of methyl orange conformed to second-order kinetics. After zero-valent Mn was added into Fe/C binary microelectrolysis system, the reaction efficiency constant of methyl orange degradation increased from 5.7381×10_^-4min_^?1 to 9.38336×10_^-4min_^?1. The degradation rate and degradation effect of methyl orange in the Fe/Mn/C microelectrolysis system was significantly better than those in the Fe/C microelectrolysis system.

Abstract:In order to breach the bottlenecks of high solid content BiOCl crystals induced crystal fragmentation and agglomeration, square bismuth oxychloride (BiOCl) crystals with high solid content, excellent dispersisty and controllable size were prepared by using polyethylene glycol monomethyl ether-b-polymethyl methacrylate N,N-dimethylaminoethyl ester (mPEG-b-PDMAEMA) as dispersant. Pearlescent printing coatings with different pearlescent effects were obtained by using the as-prepared BiOCl crystals of varied size as pearlescent pigment and self-made waterborne polyurethane (WPU) emulsion as binder. The morphology, size distribution and crystallinity of BiOCl crystals were investigated by optical microscope, particle size distribution analyzer and XRD, respectively. The air permeability, moisture permeability, water contact angle and fastness of the pearlescent printing coatings were tested. The results showed that fragment-free BiOCl crystals of regular square exhibited high crystallinity with solid content of 10 %. The pearlescent printing coating demonstrated air permeability of > 5500 g/m2?d and moisture permeability of 15～25 mm/s-1 with the water contact angle of above 130 ° and color fastness to rubbing and washing reaching 4 or above.

Abstract:The core-shell polymer microspheres PMS@SiO2 were prepared by dry water method using hydrophobic SiO2 and aqueous phase containing monomer, initiator ,crosslinking agent and water. The effects of SiO2 hydrophobicity, the ratio of silicon and water, stirring speed and stirring time on the formation of stable dry water microreactor were investigated. The polymerization conditions of core water phase were optimized by orthogonal experiment, in which ammonium persulfate and sodium bisulfite were used as initiators ,N,N'-methylene bisacrylamide was served as a crosslinking agent. The chemical structure, thermal stability and microscopic appearance of the microspheres were respectively characterized by Fourier transform infrared spectroscopy(FTIR), thermogravimetric analyzer(TGA), laser particle size analyzer, scanning electron microscope (SEM) and transmission electron microscope(TEM), its water swelling and flooding performance were also evaluated. The results showed that the best preparation condition of core-shell polymer microspheres PMS@SiO2 were as follows: the mass ratio of SiO2-R812S and water phase was 1:10, the stirring speed and stirring time were respectively 12,000 r/min and 120 s, the amount of crosslinking agent and initiators were respectively 0.1% and 0.15%, the reaction temperature was 50 ℃ and the reaction time was 4 h. The microspheres were hydrated at 90 ℃ for 20 days, and its expansion times was about 5.0. Compared with the conventional polymer microspheres PMS, PMS@SiO2 showed slower expansion. The results of physical model displacement experiment indicated that the plugging ratio of PMS@SiO2 could reach 90.39%, the residual resistance coefficient was 10.409, and the recovery rate can be increased by 34.02%. The recovery rate of PMS@SiO2 was 11.89% higher than that of PMS, with good profile control and displacement performance.

Abstract:β-cyano ketones are important fine chemical intermediates, in which cyano groups can be converted into amides, amines, carboxylic acids and their derivatives, aldehydes, ketones, alcohols, nitrogen-containing heterocycles, etc. Using cheap and low-toxic acetone cyanohydrin as the cyanogen source, the efficient preparation of β-cyano ketone was achieved through the conjugate cyanation reaction of α,β-unsaturated carbonyl compounds. The influence factors such as the type and amount of base, temperature, solvent, and the amount of acetone cyanohydrin on the reaction were investigated. Results showed that the optimal experimental conditions were obtained as follows: LiOH·H2O was used as the base, the amount of substance ratio of reaction substrate, acetone cyanohydrin, and LiOH·H2O was 1:2.5:1.6, DMF and H2O in a volume ratio of 4:1 was used as solvent, and the reaction temperature was 60 °C. Under the optimal conditions, the highest yield of β-cyano ketone was 98%. Further investigation of the scope of substrates showed that the corresponding β-cyano ketones could be obtained from 16 chalcone derivatives in the yield of 85%~98%.