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10 December 2024, Volume 45 Issue 12

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Cover and Content of Chemical Journal of Chinese Universities Vol.45 No.12(2024)

2024, 45(12):  1-6. 

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Article: Inorganic Chemistry

Mesoporous Organosilicon Hollow Nanospheres Immobilized Uricase for the Determination of Uric Acid

JI Heming, ZHANG Yuhang, MIAO Tingting, WANG Yiqian, YU Xiaorui, WANG Chunyan, WANG Runwei

2024, 45(12):  20240346.  doi:10.7503/cjcu20240346

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Mesoporous organosilicon hollow nanospheres（MONs） were synthesized through a one-step growth- induced etching method， and then uricase was successfully immobilized onto MONs， forming MONs-uircase. Comprehensive characterizations of MONs and MONs-uricase were performed using scanning electron microscopy （SEM）， transmission electron microscopy（TEM）， infrared spectroscopy， N₂ adsorption-desorption measurements， and thermogravimetric analysis（TGA）. The results indicated that uricase was successfully immobilized within the mesoporous structure of MONs， with an immobilization efficiency exceeding 90%. MONs possessed excellent adsorption properties due to their mesoporous channels and hollow structures. Compared to free uricase， MONs-uricase exhibited enhanced thermal and pH stability. In the detection of serum uric acid（UA）， MONs-uricase demonstrated a good linear relationship within the UA concentration range of 0.01—1.00 mg/mL， along with high specificity. MONs-uricase could be readily recovered through centrifugation， and the recovered MONs-uricase maintained high enzymatic activity after multiple cycles of use， retaining 50% enzymatic activity even after 20 cycles， indicating its excellent reusability. MONs offered promising application prospects in the immobilization and recycling of biological enzymes.



Intramolecular Electron Transfer Mechanism of pH-Mediated Cupric Complexes Activated Peroxymonosulfate Selective Oxidation of Aqueous Tetracycline

ZENG Xiangchu, YE Yuting, WU Zhe, WEI Ruisong, LIU Huan

2024, 45(12):  20240337.  doi:10.7503/cjcu20240337

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Although aqueous dissociative Cu（Ⅱ） could not effectively activate peroxymonosulfate（PMS）， the cupric complexes formed by complexing with tetracycline（TC） could activate PMS and realize self-catalytic degradation of TC. The generation of cupric complexes was verified by UV-Vis and high performance liquid chromatography（HPLC）， and the reaction pathways， molecular structure model， free energy variation， density of states（DOS）， and complexation interaction of cupric complexes were revealed by density functional theory（DFT） calculation. It was found that the d orbital of Cu in Cu(H₂O)₄^{2 +} was complexed by accepting the lone pair electrons of p orbital from hydroxyl， carbonyl， and amide group O in TC， and there were five possible complexation models constructed， all of them showed a stable bidenate ligands and hexatomic-ring coordination structure， in which the free energy of complex M 1 became the smallest and its structure was the most stable. The interaction of cupric complexes formation mainly included van der Waals force， weak interaction， covalent bond， steric hindrance， coordination bond， etc. Cu（II）/PMS system had significant self-catalytic degradation of TC， which could be completely degraded within 240 min（degradation efficiency was greater than 99%）. Furthermore， under alkaline conditions（pH=10）， the activation of peroxymonosulfate by cupric complexes coupling Cu（III） complexes generation in situ promoted an intramolecular electron transfer（IET） process dominating the selective oxidation of TC. The pH-mediated IET mechanism of cupric complexes activated peroxymonosulfate selective oxidation of aqueous tetracycline was further elucidated through DFT calculations from dynamic and microscopic perspectives. The new findings in this paper further verified the self-catalytic selective oxidation performance and mechanism by aqueous cupric complexes activated PMS system， which provided a potential solution for the synergistic decontamination of actual wastewater contaminated heavy metals and antibiotics.



Analytical Chemistry

Preparation and Detection Performance of Norfloxacin Imprinted Electrochemical Sensor

LI Jiahui, ZHANG Jian, YAN Long, FENG Yun, ZHANG Jiali, LIU Yongxin, YANG Shaoming

2024, 45(12):  20240322.  doi:10.7503/cjcu20240322

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Aiming at the trace detection of norfloxacin（NOR）， an electrochemical sensor with high sensitivity and selectivity for NOR was constructed by taking advantage of electrochemical analysis and the selectivity of molecularly imprinted polymers， and taking metal-organic framework（MOF） doped with highly conductive materials as a mimetic enzyme. Among them， the molecularly imprinted polymer membrane was obtained by electropolymerization with NOR as a template and o-phenylenediamine as a functional monomer. The results show that the linear range of the sensor is 1.0×10^‒7—1.0×10^‒5mol/L， the linear regression equation is I=-30.682-37.505lgc， the correlation coefficient is 0.987， and the detection limit reaches 3.2×10^‒9 mol/L. In the detection of actual samples， the sensor shows high sensitivity（relative standard deviation is 3.0%） and high accuracy（recovery rate is 96.6%—102.3%）， which shows that it has application potential in drug dosage detection and environmental monitoring.



A Double-Chamber Enzymatic Biofuel Cells-based Self-powered Glucose Biosensor Based on Graphene/Gold Nanoparticles/Titanium Carbide Nanocomposite

LI Shixuan, MENG Hua, YIN Xuehu, YI Jinfei, MA Lihong, ZHANG Yanli, WANG Hongbin, YANG Wenrong, PANG Pengfei

2024, 45(12):  20240301.  doi:10.7503/cjcu20240301

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Enzymatic biofuel cells（EBFCs）-based self-powered sensing device has the advantages of simple structure， easy miniaturization， and no need for external power supply. It exhibits potential application prospects in clinical diagnosis， environmental monitoring， biosensing， and other fields. Graphene/gold nanoparticles/titanium carbide（rGO/AuNPs/Ti₃C₂） nanocomposite modified glassy carbon electrode（GCE） was used as cathode of EBFCs （rGO/AuNPs/Ti₃C₂/GCE）. The bioanode of EBFCs was prepared via immobilization of glucose oxidase（GOx） on the surface of rGO/AuNPs/Ti₃C₂/GCE. A double-chamber enzymatic biofuel cells-based self-powered glucose biosensor（EBFCs-SPGB） was constructed by combining as-prepared bioanode and cathode in supporting electrolyte separated with a Nafion membrane. In the presence of target glucose， the GOx fixed on the surface of the bioanode promotes an enzymatic reaction. The electrons generated by catalyzing glucose transferred to the cathode through an external circuit， resulting in a reduction reaction on the cathode surface and generating an electrochemical response signal. Due to the excellent conductivity， biocompatibility， and large specific surface area of rGO/AuNPs/Ti₃C₂ nanocomposite， the synergistic effect of nanocomposite can significantly increase loading amount of GOx and effectively promote electron transfer on the electrode surface. The maximum power output signal of the constructed EBFCs-SPGB shows a good linear relationship with glucose concentration in the range of 0.3—10 mmol/L， with a detection limit of 0.1 mmol/L（S/N=3）， which can be applied to analysis of glucose concentration in human serum samples.



A Data Normalization Method of Thermal Proteome Profiling

ZHEN Xueyan, ZHOU Baojin, LIU Jingwen, REN Yan

2024, 45(12):  20240286.  doi:10.7503/cjcu20240286

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We developed a simple， cost-effective method with wide application for the accurate identification of small molecule target proteins， in which indexed retention time（iRT） peptides were adopted to be an internal standard for quantification normalization in label-free quantitative thermal proteome profiling（TPP） analysis. The iRT standard peptides were supplemented into the lysates of 293T cells treated by a well-characterized model drug methotrexate（MTX）. These peptides were quite stable during heating under different temperatures and it is reasonable to use them for quantification normalization. The results showed that iRT peptides used as an internal standard provided a good normalization effect on the global proteomes. Meanwhile， the melting curve of the target protein dihydrofolate reductase（DHFR） of MTX has been improved. This method provides an important experimental basis for the implementation and quantitative accuracy of label-free TPP techniques.



Novel Rare Earth Near-infrared Fluorescent Probes for in vivo Multiplexed Imaging

LI Hongyu, ZHANG Hongxin

2024, 45(12):  20240181.  doi:10.7503/cjcu20240181

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Fluorescence encoding and in vivo multiplexed imaging with dual-dimensions of excitation and emission are proposed. A series of second near-infrared（NIR-II， 1000—1700 nm） fluorescent probes［ α-NaYbF₄∶8%Tm@NaYbF₄@NaYF₄（Yb/Tm）， α-NaYbF₄∶2%Er@NaYbF₄@NaYF₄（Yb/Er） and β-NaErF₄@NaYF₄（Er@Y）］ were developed for triple-channel in vivo imaging. Among them， Yb/Tm nanoparticles can emit 1640 nm long-wave second near-infrared fluorescence（NIR-II-L， 1500—1900 nm） under 915 nm laser excitation while no fluorescence signal can be detected under 808 nm excitation. Yb/Er can emit NIR-II-L fluorescence at 1532 nm under excitation of 915 nm laser while no fluorescence signal can be detected under 808 nm excitation. In contrast， Er@Y nanoparticles excited by an 808 nm laser can emit NIR-II-L fluorescence at 1525 nm， while a very weak signal can be detected under the excitation of 915 nm. The design of rare earth core-shell nanostructures successfully enhances the fluorescence intensity by 216 times. Under different power density excitations， the nanoparticles still maintain excellent optical properties of independent excitation/emission. Based on the unique optical properties of these nanoparticles， optical encoding and in vivo high-resolution detection with three channels have been achieved， providing new tools and solutions for optical information storage and in vivo multiplexed analysis.



Organic Chemistry

Optimized Synthesis of Natural Product Penasulfate A， a Dual Inhibitor Against α -Glucosidase and Human Cancer Cells

ZHANG Nan, DENG Changxuan, LIN Hanlin, GAO Yangguang

2024, 45(12):  20240363.  doi:10.7503/cjcu20240363

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α-Glucosidase inhibitors possess broad applications in terms of antidiabetes， anticancer， antivirus， therapy of obesity and so on. In this work， a new convergent synthetic route of Penasulfate A which is a dual inhibitor against α-glucosidase and human cancer cell lines was presented. Olefin cross-metathesis（CM）， TEMPO-catalyzed oxidation， Mitsunobu reaction， copper（I）-salt catalyzed coupling reaction and Julia olefination reaction were leveraged as the key steps. The total synthesis of Penasulfate A has been completed over 10 longest linear steps with an overall yield of 13.2%， better than the previous route in which the title compound was synthesized in 14 linear steps with an 8.6% overall yield. This provides the candidate protocol for the syntheses of Penasulfate A and its analogues， along with the possibilities for the deeply investigation on their biological activities.



Physical Chemistry

pH-Universal Hydrogen Evolution Reaction Performance Boosted by Electronic Interaction Between Ultrafine Pt Nanoparticles and MOF Support

YU Wenli, WANG Zixuan, DONG Bin, WU Zexing, CHAI Yongming, WANG Lei

2024, 45(12):  20240408.  doi:10.7503/cjcu20240408

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The metal-support interactions can induce the charge transfer between the metal and the support， changing the catalytic performance of the catalyst， which is the key to design an efficient and durable electrocatalyst to promote the electrocatalytic reaction. In this work， the ultrafine Pt nanoparticles were anchored on the surface of MOF（Pt-Vc-MOF） by ascorbic acid assisted treatment. Due to the strong interfacial interaction of Pt-Vc-MOF， MOF-support can donate electrons to Pt， contributing to abundant catalytic active sites to effectively promote hydrogen evolution reaction. The electron-enriched Pt exhibits a low overpotential of 17， 45 and 32 mV at 10 mA/cm² in acidic， alkaline and neutral electrolytes， respectively， which was superior to commercial Pt/C catalysts. This work can provide ideas for the design of high efficiency catalyst with supported nanometric metal cluster.



Nano TiN/h-BN Fiber Composite Photothermal Aerogels for Boosting Solar-driven Seawater Desalination

JIANG Hang, GU Haohui, LIANG Feng, HE Gangjun, TIAN Yu

2024, 45(12):  20240403.  doi:10.7503/cjcu20240403

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In this paper， a novel nano titanium nitride/hexagonal boron nitride（TiN/h-BN） fiber composite photothermal aerogel was synthesized using melamine（C₃H₆N₆）， boric acid（H₃BO₃）， ethanol（C₂H₅OH）， urea ［CO（NH₂）₂］ and titanium tetrachloride（TiCl₄） as raw materials， through vacuum impregnation and in situ reaction methods. The photothermal conversion and seawater desalination properties of the composite photothermal aerogel were evaluated. The results indicate that titanium nitride nanoparticles were in situ grown on the surface of boron nitride fibers， which significantly improved the light absorption， water wettability and photothermal conversion properties of the aerogel. Under artificial sunlight illumination（1 kW/m²）， the surface temperature of the composite aerogel rose to 66.8 ℃ equilibrium temperature within 100 s， demonstrating high optical absorption and efficient solar-to-thermal conversion. As a result， the composite photothermal aerogel presented a water evaporation rate of 2.88 kg·m^‒²·h^‒¹ with an evaporation efficiency of 93%. Additionally， the TiN/h-BN composite photothermal aerogel possessed excellent cycle stability with a removal rate of cation in artificial seawater as high as 99.9%， indicating great potential for application in seawater desalination.



Crystallization Behaviors of Polydisperse Ultra⁃soft Spherical System

ZHAO Can, SUN Guangkai, LEI Bocheng, ZHANG Lili, SUN Zhaoyan, ZHU Youliang

2024, 45(12):  20240388.  doi:10.7503/cjcu20240388

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The systems of particles with ultra-soft potential interactions show complex phase behaviors， such as micro phase separation， reentrant melting and single phase change. In recent years， ultra-soft interaction system draws broad interest of research， but the crystallization behavior of this kind of material is still an open question. In this work， we use the molecular dynamics simulation method to investigate the static structures， diffusion and cluster living time of the ultra-soft spherical systems. By increasing dispersion of sphere size， the crystal structure gradually alters from cluster crystal to cluster glass. By analyzing the diffusion behavior of the polydisperse system and the lifetime of the dimer， it is found that the system has no long-range diffusion at low temperature， but obvious diffusion phenomenon occurs at high temperature. The lifetime of the dimer decreases upon the increase of temperature， or the increase of dispersion.



Theoretical Study on the Performance of Two-dimensional T-BN/T-graphene Heterojunction as Anode for Lithium-ion Batteries

GAO Guoxiang, XIONG Xin, LIU Chunsheng, YE Xiaojuan

2024, 45(12):  20240371.  doi:10.7503/cjcu20240371

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In recent years， with the wide spread application of electronic devices and the popularity of new energy vehicles， lithium-ion batteries（LIBs） attract much of attention due to their high charging/discharging rates and high energy density. Meanwhile， two-dimensional（2D） heterojunctions have shown significant potential in the research of LIBs anode materials due to their high conductivity， low volume expansion， good cycle life and stability， and high specific surface area. Therefore， we investigated the performance of heterojunction composed of 2×2 T-BN and 3×3 T-graphene tilted at 45° as anode materials for LIBs through first-principles calculations based on density functional theory. The band structure of the T-BN/T-graphene heterojunction exhibited metallicity， indicating its good conductivity. The adsorption energy of a single Li ranged from ‒0.18 eV to ‒1.48 eV. As an anode material for LIBs， the T-BN/T-graphene heterojunction also exhibited a lower diffusion barrier（0.30—0.61 eV）， a larger theoretical capacity（678.5 mA∙h/g）， an appropriate average open circuit voltage（1.06 V）， and a smaller lattice constant change（0.86%/0.44%）. Compared with T-BN and T-graphene monolayer， the T-BN/T-graphene heterojunction has slightly improved diffusion behavior of Li， with the lowest diffusion barrier of 0.3 eV， indicating its fast charging/discharging ability. Overall， the T-BN/T-graphene heterojunction is expected to become an effective design approach for high-quality anode materials in LIBs.



Synergistic Catalysis Epoxidation of Olefins and Air by Bimetallic Catalysts Derived from ZnCo-POPs Spherical Materials

LI Ting, LU Xinhuan, LI Xixi, CHENG Rou, GUO Haotian, ZHAN Junhui, ZHOU Dan, XIA Qinghua

2024, 45(12):  20240367.  doi:10.7503/cjcu20240367

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As a new type of porous material， porous organic polymers（POPs） is widely used in heterogeneous catalysis because of its unique advantages. In this paper， a series of ZnCo-POPs bimetallic catalytic materials with different compositions were prepared by impregnation method and characterized by means of X-ray diffraction （XRD）， field emission scanning electron microscope（FESEM）， X-ray photoelectron spectroscopy（XPS）， specific surface area and pore size analysis（BET）. The Zn_0.3Co_0.6-POP-250-2 catalyst prepared by impregnation method showed the best catalytic activity. When N，N⁃dimethyl formamide（DMF） was used as the reaction solvent and the reaction temperature was 90 ℃ for 5 h， 94.3% α-pinene conversion and 95.2% epoxide selectivity were obtained， and the catalytic activity of the catalyst did not decrease obviously after being recycled for 5 times， which indicated that Zn_0.3Co_0.6-POP-250-2 catalyst has excellent catalytic performance and good stability.



Preparation and Properties of Dodecacarbonyl Alkynyl Nonionic Gemini Surfactants

LI Yaqi, XING Youmei, MA Jiewen, ZHANG Zhijun, HU Bin, FANG Weihua, YIN Yunjian, WU Zhen, WANG Guojie

2024, 45(12):  20240350.  doi:10.7503/cjcu20240350

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Nonionic Gemini surfactants are a new class of highly efficient surfactants with low surface tension and excellent wettability， which have great potential for application in the field of advanced wet electronic chemicals. Four nonionic Gemini surfactants with different polyoxyethylene chain lengths（n） are synthesized from 2，5，8，11- tetramethyldodec-6-yne-5，8-diol and ethylene oxide， namely P1（n=2）， P2（n=4）， P3（n=5） and P4（n=7）. The chemical structures of the surfactants are identified by Fourier transform infrared（FTIR） and ¹H nuclear magnetic resonance（NMR） spectra. The alkyl chain of the 2，5，8，11-tetramethyldodec-6-yne-5，8-diol is hydrophobic and the polyoxyethylene chain is hydrophilic， so the hydrophilic/hydrophobic ratio of the surfactant can be adjusted by adjusting the length of the polyoxyethylene chain. The effects of different polyoxyethylene chain lengths on surface tension， critical micelle concentration（cmc）， wetting ability， foam performance， and emulsification capacity are investigated. With increasing the polyoxyethylene chain length， the polarity and hydrophilicity of the surfactant increases， leading to a gradual increase in the cmc. The surface tension at cmc（γ_cmc， mN/m） decreases and then increases with increasing polyoxyethylene chain length， among which the γ_cmc of P2 is the lowest， 27.19 mN/m， exhibiting excellent surface activity； P2 shows excellent wetting properties with the lowest contact angle of 48° on polytetrafluoroethylene（PTFE） substrate. The foaming and emulsifying properties increase with the length of the polyoxyethylene chain， and P2， P3， and P4 show excellent foaming and emulsifying properties. The excellent emulsifying properties of the surfactants are also illustrated by optical micrographs of droplet size and distribution aggregation. By investigating the effects of different polyoxyethylene chain lengths on the surface tension， cmc， wettability， foaming performance， and emulsifying property of dodecacarbonyl alkynyl nonionic Gemini surfactants， we have provided a theoretical basis for the structure-property relationship of surfactants， which is of great significance in promoting the practical applications in the field of wet electronic chemicals.



High-performance Near-infrared Photodetector Based on Surface Periodic Structure of the Perovskite Single-crystal Sheet

ZHANG Zhenyu, WANG Guoping

2024, 45(12):  20240347.  doi:10.7503/cjcu20240347

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In this paper， millimeter-sized CH₃NH₃PbI₃（MAPbI₃） single-crystal sheets（SCSs） were synthesized using the spatial confinement method， and the periodic structures were fabricated on the SCS surface by focused ion beam（FIB） etching technology， enabling the resonance absorption peak to be located in the near-infrared band. Based on this active layer， a longitudinal-structured photodetector（PD） was constructed. The detection capability of such device in the two-photon near-infrared light（1064 nm） was significantly enhanced by two orders of magnitude compared to the device based on pristine MAPbI₃ SCSs. Specifically， the PD responsivity can reach 0.6 A/W， the on-off ratio can reach 1.7×10⁴（the dynamic linear region is approximately 84.6 dB）， the external quantum efficiency can reach 58.2%， and the specific detectivity is about 6.3×10¹² Jones（1 Jones=1 cm·Hz^1/2·W^-1）. The result demonstrates the high feasibility of FIB etching for processing the periodic structure on the surface of MAPbI₃ SCSs， which will greatly contribute to the design and fabrication of high-performance near-infrared photodetectors based on perovskite single-crystal sheet.



Effect of Nitrogen-doped Carbon Cage Loaded with Amorphous Fe Nanoparticles Modified Separator on Electrochemical Performance of Lithium-sulfur Battery

HUO Yu, SUN Qian, MA Cheng, WANG Jitong, QIAO Wenming, YU Zijian, ZHANG Yinxu

2024, 45(12):  20240342.  doi:10.7503/cjcu20240342

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To suppress the shuttle effect of polysulfides and improve the reversibility of redox reactions in lithium-sulfur battery， a porous nitrogen-rich carbon nanocage loaded with amorphous Fe nanoparticles（Fe-CNx） was synthesized by high temperature carbonization with Fe-ZIF-8 as the precursor. The results show that the Fe and N atoms on the surface of Fe-CNx are bonded with S and Li atoms in lithium polysulfides（LiPS）， respectively， thus limiting the diffusion and shuttle of LiPS. In addition， the introduction of Fe atoms reduced the overpotential of LiPS conversion reaction and accelerated the redox kinetics. Therefore， the lithium-sulfur（Li-S） battery with Fe-CNx separator shows excellent electrochemical performance： the specific capacity of the battery can still be maintained at 94.3% of the initial capacity after 100 cycles of 0.2C， and the high specific capacity of 660 mA·h/g can be achieved even at high rate of 3.0C， and the residual specific capacity can still reach 603.2 mA·h/g after long cycles of 800 at 1.0C.



Construction of Double S-scheme YVO₄/TiO₂/BiVO₄ Heterojunction and Its Photocatalytic CO₂ Reduction Performance

CAO Tieping, LI Yuejun, SUN Dawei

2024, 45(12):  20240298.  doi:10.7503/cjcu20240298

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The double S-scheme heterojunction of YVO₄/TiO₂/BiVO₄ compoite fibers material was prepared by one-step hydrothermal method using TiO₂ electrospun nanofibers as substrate. The structures of the composite catalyst were characterized by X-ray diffraction， scanning electron microscopy， transmission electron microscopy， X-ray photoelectron spectroscopy， ultraviolet visible diffuse reffectance spectroscopy and photoluminescence. The performance of photocatalytic CO₂ reduction over the composite catalyst under simulated sunlight was studied. The results show that photocatalytic activity of YVO₄/TiO₂/BiVO₄ composite fibers was investigated via production of methanogenesis from photocatalytic reduction of CO₂. The CO₂ reduction capability of composite fibers was better compared to that of monomer materials. The photocatalytic production rate of CH₄ and CH₃OH of YVO₄/TiO₂/BiVO₄ were 13.88 and 3.46 μmol·g^‒1·h^‒1， respectively. The increased photocatalytic activity of YVO₄/TiO₂/BiVO₄ is attributed to the formation of heterojunctions between YVO_4， BiVO₄ and TiO₂ as well as the S‐scheme charge transfer mode of the photogenerated carriers， both of which are conducive to separation efficiency of photo‐generated carriers and photocatalytic CO₂ reduction activity.



Polymer Chemistry

Functionalization of PBAT and Its Compatibilizing Effect on PBAT/TPS/PLA Blends

ZHANG Guangxiang, YANG Ke, YANG Jiayi, LIU Yang, ZHENG Songqi, ZHAO Guiyan

2024, 45(12):  20240381.  doi:10.7503/cjcu20240381

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In this paper， poly（butylene adipate-co-terephthalate）（PBAT）/thermoplastic starch（TPS）/poly（lactic acid）（PLA） blends were prepared through melt blending. To improve the compatibility of the blend， two reactive compatibilizers， PBAT grafted with maleic anhydride（PBAT-MA） and PBAT grafted with glycidyl methacrylate（PBAT-GMA） were prepared via free radical grafting. The interaction of the two compatibilizers with TPS and PLA and their effects on the properties of PBAT/TPS/PLA blends were investigated by rheological behavior test， tensile test， scanning electron microscopy（SEM） and dynamic mechanical analysis（DMA）. The DMA and SEM results confirmed that the addition of both compatibilizers significantly improved the compatibility of the blend and the dispersion of the dispersed phase within the blend. The results of the rheological behavior and mechanical properties showed that the PBAT/TPS/PLA blend with two compatibilizers had better mechanical properties than that of the blend with the PBAT-MA compatibilizer alone. When the mass ratio of PBAT/TPS/PLA was 60∶20∶20， the yield strength of the blend reached 13.2 MPa and the tensile elastic modulus reached 150.3 MPa. This work provides a new strategy for preparing low-cost and high-performance PBAT matrix composites.



Preparation of Phosphorus and Nitrogen Modified Halloysite Nanotube and Its Effects on the Flame Retardant， Mechanical and Ultroviolet Shielding Properties of Polylactic Acid

SHI Lingrui, WU Xiaoyu, CAO Hailiang, HE Wentao

2024, 45(12):  20240323.  doi:10.7503/cjcu20240323

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Phosphorus and nitrogen modified halloysite nanotube（HM@PHNT） was prepared by firstly intercalation of halloysite nanotube（HNT） with phenyl phosphate and then encapsulation of the modified halloysites with a cyclophosphazene network. The effects of the multifunctional additive HM@PHNT on the thermal stability， crystallization behavior， flame retardancy， mechanical properties， and UV shielding performance of polylactic acid（PLA） were systematically investigated. The results indicate that with the addition of 5%（mass fraction） HM@PHNT， the crystallinity of PLA significantly increases from 7.7% to 21.2%， and the tensile strength and elongation at break are both improved to some extent. Flame retardant test shows that the introduction of 5%（mass fraction） HM@PHNT reduces the peak heat release rate and total heat release of PLA from 510.1 kW/m² and 72.5 MJ/m² to 472.3 kW/m² and 67.5 MJ/m²， respectively. The analysis of flame retardant mechanism indicates that P-N structure and HNT generated by HM@PHNT degradation promote the formation of the charring layer， thereby reducing the heat release of the material. In addition， the UV shielding performance of PLA composite materials has been significantly improved， with a decrease in transmittance at 300 nm from 83.2% to 1.0%.