Abstract:LCST-type temperature-sensitive polymers are a class of temperature-sensitive polymers in which the polymer chains exhibit an extended solvation state before the phase transition temperature and a contracted aggregation state after the phase transition temperature. The intelligent and reversible response to the stimulation of ambient temperature change has led to the intensive study of LCST-type temperature-sensitive polymers in the fields of organic chemistry, materials science, biomedicine and oil and gas industry. By categorizing LCST-type temperature-sensitive polymers with different spatial conformations, the research progress of LCST-type temperature-sensitive polymers with linear structures, temperature-sensitive hydrogels, block structures, grafted composite structures, and other special structures is presented. Combined with the characteristics of LCST-type temperature-sensitive polymers with different spatial conformations, the current applications of LCST-type temperature-sensitive polymers in drilling fluids, such as low-temperature rheology control, temperature-sensitive intelligent plugging, viscosity enhancement and cutting, and leakage prevention and plugging, are systematically introduced. The application status of LCST-type temperature-sensitive polymers in drilling fluids is analyzed and summarized, the key problems of LCST-type temperature-sensitive polymers are clarified, and the application prospects of LCST-type temperature-sensitive polymers in drilling fluids are proposed.

Abstract:Photocatalysis, as a new environmentally friendly green technology, has great potential in areas such as environmental remediation and clean energy production. The selection of efficient and economical photocatalytic materials is the key to achieving efficient photocatalytic technology. And bismuth molybdate nanomaterials have attracted much attention from the academic community due to their unique layered structure. This paper reviews the research progress of bismuth molybdate nanomaterials in the field of photocatalysis, mainly from the aspects of bismuth molybdate crystal structure, preparation methods and common modifications. The applications of bismuth molybdate in photocatalysis are highlighted, including photocatalytic CO2 reduction, photocatalytic degradation of organic pollutants, photocatalytic hydrogen precipitation, and photocatalytic nitrogen fixation. The challenges and prospects of bismuth molybdate nanomaterials in photocatalysis have also been explored, providing new ideas for the study of bismuth molybdate photocatalytic materials.

Abstract:The article provides a review of the reaction mechanism, fluorination catalysts, and synthetic processes for chlorofluorocarbons (CFCs) substitutes or intermediates through the gas-phase fluorine-chlorine exchange. The gas-phase fluorine-chlorine exchange reaction belongs to the Swartz reaction over catalyzed by fluorination catalysts, which is mainly used for the synthesis of C1~C6 CFCs substitutes or intermediates, as well as a series of heteroatom fluorides used in important fields such as lithium batteries and fluorine-containing pharmaceuticals, with the characteristics of being environmentally friendly, highly efficient, and easily scalable for large-scale production. The future development trend of gas-phase fluorine-chlorine exchange is discussed, and the focus of future research is proposed to study the theoretical basis of chromium-based catalysts for gas-phase fluorine-chlorine exchange reactions, develop gas-phase fluorine-chlorine exchange process technologies for high-carbon chloroalkanes, and explore the application of gas-phase fluorine-chlorine exchange technology in new energy and fluorine-containing pharmaceutical fields. These directions could be research priorities in the field of fluorine chemistry in the future.

Abstract:Metal-Organic Frameworks (MOFs) are a class of emerging materials that have attracted much attention, which have a wide range of applications in the field of antimicrobials due to their tunable structure, high porosity, and large specific surface area. Polymer-based MOFs (PolyMOFs) composites are prepared by compositing MOFs materials with polymers, which can not only enhance their stability and mechanical strength, but also further expand their applications. This paper focuses on reviewing the research progress of polymer-based MOFs composites in antimicrobial aspects, including the preparation of MOFs materials and the main antimicrobial mechanisms and the preparation methods of polymer-based MOFs composites, and summarizes the antimicrobial applications of polymer-based MOFs composites in the fields of medical and health care, food preservation, air purification, water pollution control, and textile protection. Finally, the current challenges and future prospects for the development of polymer-based MOFs composites in the field of antimicrobial are discussed.

Abstract:PUF/PANI-C.O. double-walled microcapsules were prepared by in-situ polymerization and physical deposition method using castor oil (C.O.) as core material, urea-formaldehyde resin (PUF) and polyaniline (PANI) as wall materials, and added to waterborne epoxy coating (WEC) to prepare PUF/PANI-C.O./WEC composite coating. The composition and morphology of PUF-C.O. single-walled and PUF/PANI-C.O. double-walled microcapsules were characterized by FTIR, XRD and SEM. In addition, the corrosion behavior of microcapsule modified waterborne epoxy composite coating was studied by electrochemical impedance spectroscopy (EIS) and salt spray test. The results showed that PANI was successfully coated on the surface of PUF-C.O.single-walled microcapsules to form PUF/PANI-C.O.double-walled microcapsules. Compared with pure WEC and PUF-C.O./WEC, PUF/PANI-C.O./WEC exhibited more positive corrosion potential (~0.15 V) and higher low-frequency impedance value (~109 Ω·cm2) in long-term corrosion test, and the corrosion degree of the metal matrix was the lightest, showing the best corrosion resistance.

Abstract:To address the challenge of balancing stretchability and conductivity in wearable strain sensors, a conductive fiber termed MXene-TPU (MTF) has been developed. This fiber is based on thermoplastic polyurethane (TPU) as the substrate, with Ti3C2Tx MXene nanosheets prepared through an in-situ hydrofluoric acid etching process serving as the conductive material. The MXene-TPU conductive fiber is fabricated by wet spinning. Using SEM and EDS characterization, combined with experimental techniques such as electromechanical stretching/compression, materials mechanics, and human motion monitoring, we investigated the influence of MXene loading on the structure, morphology, mechanical properties, and conductivity of MTF. Additionally, we explored the sensing performance under different tensile strain conditions. The results demonstrate that the establishment of a MXene conductive network within TPU imparts a high gauge factor to the MXene-TPU conductive fiber (MTF), reaching 2930 at 120% strain. The incorporation of MXene enhances the thermal stability of the MXene-TPU conductive fiber (MTF), increasing its thermal decomposition temperature from 360°C, as observed in polyurethane fiber (TF), to 400°C. MXene forms continuous conductive pathways on both the surface and within the fiber, imparting good conductivity to the fiber (electrical conductivity of 141.54 S/m). MXene also enhances the modulus of the MXene-TPU conductive fiber (MTF). For MTF2 with a MXene loading of 21.74%, the stress at 50% strain (σ50) is 1.3 times higher than that of TF, indicating a certain level of tensile strain recovery. MTF2 corresponds to different human joint movements by expressing varying rates of resistance changes, making it suitable for human motion monitoring.

Abstract:Multifunctional bio-based nano-ZnO/PA56 composite fibers were prepared by loading nano-ZnO with bio-based PA56 as the matrix and using melt spinning technology. The morphological structure, thermal and crystalline properties of the fibers were characterized by SEM, FTIR and XRD, and the mechanical, thermal conductivity, and UV aging resistance properties were investigated. The results showed that nano-ZnO was uniformly dispersed in the matrix, and the addition of nano-ZnO decreased the mechanical properties and thermal stability of the composite fibers and increased the crystallization temperature of the composite fibers, indicating that nano-ZnO nucleated heterogeneously in the composite fibers, and the mechanical properties of the composite fibers were reduced from 3.47 cN dtex-1 to 3.06 cN dtex-1, which showed good mechanical properties. The composite fiber has excellent antibacterial, thermal conductivity and UV aging resistance, and the composite fiber with 0.5 wt% nano-ZnO content has 100% inhibition of E. coli and S. aureus, and the surface temperature of the fiber is increased by 16 oC in 50 s. The mechanical properties of the 2.0% nano-ZnO/PA56 composite fiber are 9.9% lower than that of the PA56 after 140 h of UV aging. fiber degradation rate was 9.9% lower.

Abstract:In order to solve the problem of environmental pollution and fossil resource consumption caused by nylon 66(PA66) waste, PA66 based carbon dots(66CDs) were prepared by solvothermal method with PA66 and phytic acid(IP6) as precursors and acetic acid as solvent. The structure, properties and application of PA66 were investigated. The results showed that the optimum conditions for the preparation of 66CDs were as follows:1.6 g PA66,1.1 g IP6 and 20 mL CH3COOH were added to 50 mL para polyphenol hydrothermal reactor and placed in 260 ℃ blast drying oven for 36 h. The fluorescence of the prepared 66CDs was wavelength independent, and the best excitation wavelength and the best emission wavelength were 360 nm and 490 nm, respectively. In terms of structure, 66CDs is spherical with an average particle size of 4.00 nm, and the surface contains carboxyl, hydroxyl, amino and other functional groups. In addition, the fluorescence intensity of 66CDs is not affected by common metal ions, and the anti-interference ability is outstanding, which can be used for fluorescence anti-counterfeiting and fingerprint recognition.

Abstract:The metal-ligand coordination, as a crosslinking agent, has attracted much attention in supramolecular chemistry because of its dynamic properties and different association strengths. In order to make polyurethane film have better mechanical strength and self-healing efficiency, in this study, the polyurethane (PU-DAP) was synthesized by using 2, 6-diaminopyridine (DAP) as chain extender, and then different amounts of anhydrous ferric chloride were used as crosslinking agent to coordinate with PU-DAP. A series of self-healing polyurethane films (PU-DAP/ Fe₃₊^{) w}ere synthesized. The single factor experiment results showed that when n(DAP): n(Fe₃₊⁾ was 2:1, the mechanical properties and self-healing properties of PU-DAP/Fe_3+^2:1 film were the best. The FTIR results showed that Fe₃₊ was successfully coordinated with nitrogen and oxygen on pyridine and amide groups. The thermogravimetric analysis results showed that the thermal decomposition temperature of PU-DAP/Fe_3+^2:1 film was increased by 17.15 ℃, which indicated that the thermal stability was enhanced by the crosslinking structure formed via the introduction of Fe^₃₊. The self-healing experiment and polarizing microscope testing results showed that the tensile strength and self-healing efficiency of the film were 5.16 MPa and 93.2%, respectively. And the scratches completely disappeared after 36 h at room temperature. Compared with PU-DAP, its mechanical strength and self-healing efficiency were both improved.

Abstract:A noval azo-based fluorescent probe (NA-M), derived from 6-amino-m-cresol and 1-naphthol, was successfully synthesized and characterized. NA-M had a significant enhancement of fluorescence with Al₃₊ ^{at 590 nm in} MeOH/HEPES (9/1, v/v, pH=7.4) solution, and displayed high specificity, strong anti-interference and good sensitivity (8.4×10_-7 ^M). The 1:2 binding stoichiometry between Al₃₊ ^and probe had been established from Job’s plot. Meanwhile, the complex NA-M+Al₃₊ showed high selectivity and good anti-interference ability to F_- by quenching the fluorescence, and the detection limit of complex NA-M+Al₃₊ ^to F_- ^{could reach} to 9.5×10_-7 M. Eventually, probe NA-M and its complex NA-M+Al₃₊ had also been successfully applied to detect Al₃₊ ^and F_- ⁱⁿ actual samples, respectively.

Abstract:A series of biochar (BC) supported cadmium sulfide (CdS) composites (BC@CdS) were prepared by in-situ hydrothermal growth strategy using biomass gasification char residue as raw material. The structure and physicochemical properties of the composites were characterized by XRD, SEM, BET, XPS, UV-Vis DRS, PL, and EIS. Taking levofloxacin (LVF) as the target pollutant, the effects of different m(BC)∶m(CdS) on the BC@CdS photocatalytic performance were investigated, and then the effects of the dosage of BC@CdS for the optimal photocatalytic performance, the initial mass concentration of LVF, the pH value of the system environment, co-existing ions and humic acid (HA) on the degradation rate of LVF were investigated, and the cyclic stability of material and its applicability to different pollutants were also investigated. Finally, the mechanism of BC@CdS photocatalytic degradation of LVF was speculated. The results showed that the CdS nanoparticles grew uniformly on the surface of BC, which effectively prevented their own agglomeration. BC@CdS-2 prepared with m(BC)∶m(CdS) = 1∶2 had the best photocatalytic performance which showed that the degradation of LVF (50 mL) with a mass concentration of 20 mg/L could rached to 90.87% by 20 mg BC@CdS-2, and degradation rate of LVF was 85.45% after recycled for 5 times under visible light irradiation for 90min. The degradation rates of different pollutants (ciprofloxacin, ofloxacin, oxytetracycline hydrochloride, romindane B) with mass concentration of 20 mg/L were 83.57%~93.65% by BC@CdS-2. It had anti-interference ability to the pH value of the system environment and co-existing ions. Hole (h+) and superoxide radical (?O– 2) were the main active groups in BC@CdS photocatalytic system. The reason for the enhanced photocatalytic activity of BC@CdS was that the electron transport channel constructed by BC as a carrier increased the photogenerated electron transfer rate and enhanced the visible light response of the composite. At the same time, as the acceptor of photogenerated electrons, it promoted the photogenerated electron-hole separation of CdS body. The synergistic effect of the two improved the photocatalytic activity and cycle stability of CdS.

Abstract:CS-PAA/Zn2+ composite network hydrogels were prepared by UV illumination method using chitosan (CS) and acrylic acid (AA) as raw materials and Zn2+ with bactericidal effect as ligand ion. The effects of the material ratio of AA to chitosan and the addition of Zn2+ solution on the structural morphology and properties of CS-PAA/Zn2+ were investigated by FTIR, XRD, SEM, dissolution and tensile tests, as well as cellular activity and antimicrobial tests. The results showed that the CS-PAA/Zn2+ composite network hydrogel was formed by using the CS chain as the main chain and -NH2 as the first site to cross-link the shorter PAA short chain, which reduces the generation of PAA and forms the first network; the carboxyl group on the short chain of PAA was used as the second site, which utilizes the dynamic metal coordination effect of Zn2+ to form the second network. CS-PAA/ Zn2+ composite network hydrogel exists a relatively uniform and flat outer structure and an inner structure rich in piping spaces and pores; when 1 g chitosan was used as the raw material, n(AA):n(-NH2 on CS) = 1:1, and 0.01 mol/L Zn2+ solution was added in an amount of 4.0 mL, the prepared CS-PAA/Zn2+ composite network hydrogel had the strongest swelling and stretching ability, with the maximum swelling degree of 87.2 and elongation at break of 331.265% in pH = 1 solution, while maintaining a good cellular (MDA-MB-231 cells) activity and antibacterial (Escherichia coli) properties. And the gel had low cytotoxicity, cell proliferation rate of 509%, good antimicrobial properties, and the diameter of the inhibition circle reached 5 mm after the addition of Zn2+.

Abstract:In order to improve the solubility and defoaming/foam inhibition ability of silicone antifoam agents in water, a series of hydrogen-containing polysiloxanes (LPMHS) with different chain lengths (m+n) and ratios of siloxane links to hydrogen-containing siloxane links (m/n) were prepared by polycondensation under acidic condition, using octamethylcyclotetrasiloxane (D4) and tetramethylcyclotetrasiloxane (D4H) as condensate monomers, and hexamethyldisiloxane (MM) as a terminating agent. A series of butynediol ether modified organosilicone (PSi-EO) surfactants with anti-foaming effect were prepared by grafting butynediol diethoxylate (BEO) molecules on the LPMHS chain, and then hydrogenated with BEO. The structures of PSi-EO were characterized by FTIR and 1HNMR, and the defoaming performance, surface activity and wetting and spreading properties of PSi-EO were tested by bulging, water contact angle and dynamic light scattering to investigate the conformational relationship between structure and performance. The results showed that when m/n=4, the defoaming ability of PSi-EO continued to decrease with the increase of m+n (4+1~24+6), and the foam inhibition ability was highest at m+n=16+4 (foam inhibition time of 16.53 min), but after that there was a tendency to decrease, whereas the critical micelle concentration (CMC) of its aqueous solution continued to decrease, the minimum surface tension continued to increase. The minimum surface tension of PSi-EO aqueous solution was determined by the siloxane chain length (m+n). When m+n=20, with the decrease of m/n (18/2~14/6), the defoaming ability of PSi-EO increases and the foam inhibition ability decreases, and the PSi-EO with m/n=17/3 has an excellent defoaming and foam inhibition ability (defoaming time of 71.28 s; foam inhibition time of 19.34 min). With the increase of m+n and the decrease of m/n, the molecular chain of PSi-EO was extended and the amount of hydrophilic group grafting was increased, and its contact angle was also increased, and the wetting ability was reduced. PSi-EO can form spherical micelles in aqueous solution, and the smaller aggregates can self-assemble to form large and complex aggregates with an average particle size of 100~300 nm, and its aggregate morphology is independent of its siloxane chain length and chain-length ratio. The absolute values of the standard adsorption free energies (ΔG0 ads) of PSi-EO were higher than those of the standard micellar free energies (ΔG0 mic), indicating that PSi-EO molecules were more inclined to adsorb at the gas-liquid interface, and thus the surface tension of the vesicle film in the vicinity of the molecules can be rapidly reduced, which can lead to the bubble bursting.

Abstract:Objective: To study the extraction process of flavonoids from gardenia gardenia by ultrasonic-assisted deep eutectic solvent (DES), and to study the hypoglycemic effect of flavonoids on HepG2 cells. Methods: Single factor and orthogonal method were used to optimize the extraction process of gardenia flavone with ultrasonic-assisted deep eutectic solvent. The hypoglycemic effect of gardenia flavone on HepG2 cells in vitro was investigated. Results: The optimal extraction process of flavonoids from gardenia gardenia was as follows: the deep eutectic solvent was choline chloride, the molar ratio of 1, 2-propylene glycol was 1:3, the ultrasonic time was 40 min, the ultrasonic temperature was 60℃, the water content was 20%, the ratio of solid to liquid was 1:33 (g/mL). In addition, in vitro hypoglycemic activity study showed that gardenia flavone has good hypoglycemic activity. Conclusion: This study provides a green and efficient method to extract flavone from gardenia gardenia, and the flavonoid has hypoglycemic activity to a certain extent, which aims to lay a foundation for the industrialization of gardenia gardenia.

Abstract:Water extraction and alc?OHol precipitation method was used to extract polysaccharides from Forsythia suspensa, and Forsythia suspensa polysaccharide nano selenium (FP-SeNPs) was prepared through nitric acid-sodium selenite method. UV-Vis, FTIR, XRD, and SEM were used to characterize their absorption spectra, tissue structure, and surface morphology. ?DPPH radical, ?OH radical, and ?ABTS radical were used to investigate the antioxidant capacity of FP-SeNPs in vitro. The hypoglycemic activity of FP-SeNPs was investigated by α-amylase and α-glucosidase inhibition assay. The results showed that the selenium content in FP-SeNPs was 908mg/kg; FP-SeNPs formed a surface structure with granular distribution, changing the surface morphology of polysaccharides, but did not destroy the basic structure of polysaccharides. A new absorption peak was generated at around 270 nm, and a diffuse peak was observed in the XRD pattern between 20°and 30°, which indicated that there was an interaction between FP and SeNPs, and the FP-SeNPs complex was formed. The scavenging ability of FP-SeNPs on ?DPPH, ?OH, and ?ABTS radicals and the inhibitory ability on α-amylase α-glucosidase were concentration-dependent. The scavenging rates of 1.6 mg/mL FP-SeNPs solution on ?DPPH, ?OH, and ?ABTS free radicals were 91.98%, 56.81%, and 87.44%, and the inhibitory rates on α-amylase and α-glucosidase were 55.61% and 72.73%, respectively, which were significantly higher than that of FP (P<0.05).

Abstract:Sulfonated lignin-derived mesoporous carbon (MC-SO3H) solid acid was synthesized by solvent evaporation-induced self-assembly (EISA) method using organic solvent extracted lignin as carbon precursor and glyoxal as crosslinking agent. The MC-SO3H has a mesoporous surface area of 120.74 m2/g and an average pore size of 4.15 nm, and exhibited excellent activity in catalytic conversion of xylan to furfural. An optimized furfural yield of 79.5% was achieved from 1 g xylan catalyzed by 1 g MC-SO3H in γ-valerolactone (GVL) solvent and reacted at 180 ℃ for 10 min. Moreover, MC-SO3H showed satisfactory reaction stability and reusability in catalytic conversion of xylose to produce furfural. This study provides a promising new strategy for the rationally utilization of lignin sources of lignocelluloses.

Abstract:According to the hydrogenation characteristics of mixed long chain α-olefin, Ni/γ-Al2O3 was prepared using Dry Impregnation (DI) with γ-Al2O3 serving as the carrier. Both the catalyst and the raw material were characterized using TEM and BET to investigate the relationship between the pore size of the catalyst and the particle size of the mixed olefin. The results show that the catalyst can effectively reduce the resistance of olefin entering the catalyst channel and eliminate the effect of internal diffusion. In order to further optimize the performance of the catalyst, Charge Enhanced Dry Impregnation (CEDI) was employed to enhance the catalyst performance. The results showed that the catalytic performance of the catalyst prepared by CEDI was doubled compared with that of DI. Analysis through XRD, SEM, and TEM revealed that the Ni nanoparticles in Ni/γ-Al2O3 prepared by CEDI are well-dispersed on the carrier, exhibiting a particle size of approximately 5.0 nm and demonstrating excellent catalytic activity. Additionally, XPS confirmed the strong metal-carrier interaction in Ni/γ-Al2O3, which imparts resistance to sintering and coking at the active site during the hydrogenation of long-chain olefin, thereby ensuring good stability.

Abstract:The dendritic fibrous silica (KCC-1) was prepared by hydrothermal synthesis, and solid base catalyst K/KCC-1 with different loading was prepared by equal volume impregnation with potassium acetate as precursor. The crystal morphology, pore structure and basic characteristics of K/KCC-1 material were characterized by XRD, FTIR, BET, CO2-TPD and SEM etc. The transesterification performance of dimethyl carbonate (DMC) and ethanol to methyl ethyl carbonate (EMC) was evaluated. The results indicate that the K/KCC-1 catalyst has two types of basic sites, the weak basic sites provided by K-O-Si and the medium strong basic sites provided by K2CO3. With the increase of K loading, the weak basic sites gradually decrease, and the medium strong basic sites gradually increase, enhancing the reaction activity of transesterification. K/KCC-1 with a K loading of no more than 0.9 still maintains the dendritic fiber structure of KCC-1, allowing the reactant molecules to easily diffuse to the Active site. 0.9K/KCC-1 has the highest catalytic activity. Under the optimal reaction conditions of reaction temperature of 80 oC, reaction time of 5 hours, molar ratio of DMC to ethanol of 4:1, and catalyst dosage of 5% of DMC, the conversion rate of DMC is 91.0%, and the EMC selectivity is 95.5%.

Abstract:Multilayer Ti3C2(MXene) as a carrier was prepared using hydrofluoric acid as an etchant and Ti3AlC2 as raw material, Ni/Ti3C2 with Ni loading (mass fraction of Ni in the catalyst, same as the whole text) of 5%~20% was prepared by a KBH4 reduction method. The structural composition, morphological features and surface properties of Ni/Ti3C2 were characterized by XRD, FTIR, SEM, N2 adsorption-desorption, NH3-TPD, etc, and the catalytic performance of Ni/Ti3C2 for selective hydrogenation of cinnamaldehyde with different Ni loadings was investigated. The results showed that 10Ni/Ti3C2 with 10% Ni loading exhibited the best catalytic performance, and its Ni metal particles uniformly loaded on the surface of Ti3C2 with a well-defined layer structure and a specific surface area of 9.6 m2/g, exhibited the smallest average metallic Ni particle size (43.59 nm) and the highest dispersion (0.21%); The specific surface area and acid site strength of Ni/Ti3C2 increased gradually with increasing Ni loading in the range of 5% to 20%, with little change in the types of acid sites on the surface, 10Ni/Ti3C2 exhibited strong Lewis acid sites (NH3 desorption peak at approximately 511 °C) and good thermal stability. 0.5 g of 10Ni/Ti3C2 for selective hydrogenation of cinnamaldehyde reaction for 3 h under the conditions of 1.0 g cinnamaldehyde, reaction H2 pressure of 2.0 MPa, 30 mL of isopropanol as solvent, and reaction temperature of 120 °C, the cinnamaldehyde conversion and hydrocinnamyl alcohol selectivity were 100% and 99.29%, respectively. In five cycles, 10Ni/Ti3C2 showed high catalytic stability, 100% cinnamaldehyde conversion and 99.29%~92.07% hydrocinnamyl alcohol selectivity.

Abstract:In order to improve the aggregation phenomenon of metal phthalocyanines and enhance their photocatalytic activity, MIL-53(Al) with flexible frame and large pore structure was selected as the carrier, and carboxyl substituted metal phthalocyanines (MTcPc, M=Mn, Fe, Co, Ni, Cu, Zn) were loaded on the surface of MIL-53(Al) by hydrothermal method. MTcPc/MIL-53(Al) composite material with adsorption-photocatalytic oxidation desulfurization performance was prepared. Its morphology, structure and element distribution were characterized by SEM, XRD, FTIR, UV-Vis and XPS, and thiophene/n-octane was used as simulated fuel at room temperature and pressure with oxygen as oxidant. The desulfurization performance of MnTcPc/MIL-53(Al) photocatalytic oxidation was tested. The results showed that the phthalocyanine molecules were evenly dispersed on the carrier MIL-53(Al) in an ordered crystalline form, and the agglomeration problem was significantly improved. The planar conjugated structure of the phthalocyanine molecules had an obvious induction effect on the growth of MIL-53(Al) crystals in a specific direction. The Q-band of MTcPc/MIL-53(Al) has a certain degree of redshift, which extends the optical response range. MnTcPc/MIL-53(Al) showed the best photocatalytic desulfurization performance. After 150 min of catalytic reaction, the thiophene conversion rate was 100%. After five cycles of use, the thiophene conversion rate decreased to 93.01%.Moreover, the breathing effect of MIL-53(Al) promoted the enrichment of thiophene molecules and molecular oxygen on the catalyst surface, which was conducive to the formation of active intermediate MIL-53(Al)/MTcPc-1O2 to improve the photocatalytic desulfurization properties of thiophene. Mechanistic studies revealed that the conjugation structure and central ion configuration of metal phthalocyanine strongly affected the oxidative desulfurization properties of MIL-53(Al)/MTcPc.

Abstract:On the basis of previous research on osthole, twenty-four ester derivatives were designed and synthesized, and confirmed by ₁^H NMR, ₁₃^C NMR and elemental analysis. The result showed that the activities of compound 4h and 4t against S. aureus, MRSA, E. coli and FREC were the most significant, the MIC of 4h was 4, 16, 8, 16 μg/mL respectively, and the MIC of 4t was 2, 8, 4, 8 μg/mL respectively, and their inhibitory activities against the tested bacteria were better than that of previous compounds, which have potential research value.

Abstract:Sweet corn core polysaccharide (SCP80) was co-heated with ferric chloride to synthesize sweet corn core polysaccharide iron complex (SCP80—Fe), and the preparation process of SCP80—Fe was optimized by response surface method on the basis of single-factor experiments. SCP80—Fe was structurally characterized by SEM, XRD, TG, particle size distribution, UV-Vis, and FTIR. Finally, the antioxidant and hypoglycemic activities in vitro were studied. The results showed that the optimal synthesis process of SCP80—Fe was m(SCP80):m(trisodium citrate)=3.63:1, pH value of 8.5, reaction temperature of 75 °C, reaction time of 64.6 min, and the iron content of SCP80—Fe was 27.89±0.35%. The iron in SCP80—Fe is associated with SCP80 in the form of a β—FeOOH iron core, which has a smooth surface, increased particle size and better thermal stability than SCP80. The results of in vitro antioxidant experiments showed that SCP 80—Fe has better hydroxyl radical scavenging and reducing capabilities. The results of in vitro hypoglycemic experiments showed that the IC50s of SCP80—Fe for the inhibition rates of α-amylase and α-glucosidase were 1.20±0.11 mg/mL and 0.92±0.07 mg/mL, respectively, which had better in vitro hypoglycemic activity than SCP80.

Abstract:Three kinds of natural starch, corn starch, waxy corn starch and cassava starch, were used as raw materials to prepare starch-based microspheres by dropping method after high temperature gelatinization. The effects of starch type, starch concentration and needle aperture on microsphere formation were investigated. It was found that the particle size of the microspheres increased with the increase of starch concentration and needle aperture, and the corn starch-based microspheres showed the largest particle size at the same starch concentration and needle aperture. The starch-based microspheres have uniform morphology, and its yield can reach more than 90%. The particle size of the microspheres was 1.0~1.5 mm, and they had different degrees of the hollow structure. Compared with the natural starch, the gelatinization exothermic peak of starch-based microspheres basically disappeared, the crystal type changed and the crystallinity decreased significantly. The α-amylase enzymolysis rate of corn starch microspheres was higher than that of corn starch at 24 h, and the release rate of the loaded Methylene blue corn starch based microspheres could reach more than 59.28% after heating in aqueous solution at 30°C ~90°C for 1 h, indicating that they were beneficial to load various hydrophilic substances.

Abstract:In order to improve the additional value of waste distiller"s resource utilization and achieve efficient adsorption and degradation of dyes, the microbial immobilized porous charcoal (Massibacillus-DGPC) for the removal of methylene blue (MB) from dyeing wastewater was prepared by using Bacillus massiliogabonensis strain and porous charcoal material (DGPC). The FTIR, EDS and SEM were used to characterize The structure of Massibacillus-DGPC. The environmental factors such as pH and salinity on Massibacillus-DGPC adsorption and degradation methylene blue were studied. The results showed that though the adsorption process of Massibacillus-DGPC was affected by many factors, The decolorization rate can maintain more than 78% in different pH and salinity environments. In addition, compared with other treatment groups, Massibacillus-DGPC showed superior adsorption and degradation capacity and renewable capacity. The MB removal rate of Massibacillus-DGPC reached more than 99% in 6 rounds of recycling. After 8 rounds of recycling, the MB removal rate of Massibacillus-DGPC was still as high as more than 92%, and achieved The complete degradation of more than 50% MB. The microbe immobilized porous distiller"s grains charcoal has good adsorption and degradation performance of MB, and has strong renewable ability. The results have certain value for the efficient treatment of dye wastewater by recycling of distiller"s grains waste.

Abstract:Three copper-based nitrogen-carbon microspheres Cu-x/NC (x=1, 2, 3) were successfully synthesized by a one-step hydrothermal method using water-soluble low-molecular-weight chitosan (0.1 g) as carbon and nitrogen sources, and copper nitrate trihydrate (0.1802, 0.2899, 0.6522 g) served as copper sources. The morphology, composition and structure of Cu-x/NC were characterized by SEM, FTIR, XRD, Raman and BET. The adsorption performance of Cu-x/NC to tetracycline hydrochloride (TC) was investigated by static adsorption experiments. The parameters of adsorption kinetics, adsorption isotherms and adsorption thermodynamics were also determined. Cu-x/NC against ionic interference, pH stability, and cyclic adsorption properties of Cu-x/NC were detected. The results showed that Cu-x/NC exhibited a regular spherical structure with oxygen-containing and nitrogen-containing groups on its surface, and Cu elements were uniformly distributed. Cu-2/NC exhibited the maximum adsorption capacity for TC adsorption (1993.42 mg/g) at 25 °C of adsorption temperature and 24 h of adsorption time. The adsorption of TC by Cu-2/NC was in accordance with the Langmuir isotherm model and pseudo-second-order kinetic model, and the adsorption process was spontaneous and endothermic. The presence of NaCl in TC solution didn’t reduce the equilibrium adsorption capacity of Cu-2/NC toward TC, and TC solution pH=5.5 was most favorable for adsorption. In the 8-cycle adsorption tests, Cu-2/NC showed a relatively stable removal rate to TC (95.84%~86.67%). The main driving force for TC adsorption by Cu-2/NC depended on hydrogen bond, Cu cation bonding bridge, electron donor-acceptor interaction and electrostatic interactions.