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Polyoxometalates coupled covalent organic frameworks as highly active photothermal nanoreactor for CO_(2)cycloaddition

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Nano Research 2024年第7期17卷 5975-5984页

作者： Tian Wang Yunqing Zhu Wei Wang junfeng niu Zhiyi Lu Peilei He School of Environmental Science and Engineering Shaanxi University of Science and TechnologyXi’an 710021China Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China College of Environmental Science and Engineering North China Electric Power UniversityBeijing 102206China University of Chinese Academy of Sciences Beijing 100049China

Covalent organic frameworks(COFs)-based nanoreactors have attracted broad interest in many fields due to their voidconfinement ***,the inherent drawback of conventional nanoreactors is the lack of internal active sites,which limits their widespread ***,we report the construction of hierarchical COF(EB-TFP)nanoreactor with pre-synthesized polyoxometalates(POM,[PV_(2)W_(10)O_(40)]^(5–)(PV_(2)W_(10)))clusters encapsulated inside of COF(POM@COF).PV_(2)W_(10)@EB-TFP anchors nucleophilic-group(Br–ions)and PV_(2)W_(10)anion cluster within the COF framework via electrostatic interactions,which not only simplifies the reaction system but also enhances catalytic *** reaction performance of the PV_(2)W_(10)@EB-TFP nanoreactor can be tuned to achieve excellent catalytic activity in CO_(2)cycloaddition reaction(CCR)for~97.63%conversion and~100%selectivity under visible light irradiation.A mechanistic study based on density functional theory(DFT)calculations and insitu characterization was also carried *** summary,we have reported a method for achieving the uniform dispersion of POM single clusters into COF nanoreactor,demonstrating the potential of POM@COF nanoreactor for synergistic photothermal catalytic CO_(2)cycloaddition.

关键词： photothermal nanoreactor CO_(2)cycloaddition polyoxometalate photothermal-synergistic catalysis covalent organic frameworks

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Covalently bonded ternary photocatalyst comprising MoSe_(2)/black phosphorus nanosheet/graphitic carbon nitride for efficient moxifloxacin degradation

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Chinese Chemical Letters 2024年第9期35卷 356-359页

作者： Yuhao Ma Yufei Zhou Mingchuan Yu Cheng Fang Shaoxia Yang junfeng niu College of Environmental Science and Engineering North China Electric Power UniversityBeijing 102206China College of Water Conservancy and Hydropower Engineering North China Electric Power UniversityBeijing 102206China Global Centre for Environmental Remediation(GCER) University of NewcastleCallaghanNSW 2308Australia

Covalently bonded bridging between different semiconductors is a remarkable approach to improve the transfer of charge carriers at *** this study,we designed a ternary heterojunction(MBG)combining of molybdenum diselenide(Mo Se_(2)),black phosphorus nanosheets(Bpn)and graphitic carbon nitride(GCN).Among this MBG of Mo Se_(2)/Bpn/GCN,(i)the covalently bonded bridging effect between Bpn/GCN facilitates directional charge carrier transfer,meanwhile(ii)a Z-scheme heterojunction is formed between Mo Se_(2)/GCN to enhance the separation of photogenerated ***,(iii)this composite exhibits an increased absorption for visible *** this MBG,photocatalytic degradation of over 98%of moxifloxacin is achieved within 20 min,with O_(2)·-confirmed as the primary photocatalytic active *** findings provide novel insights into the construction of efficient heterojunction by covalently bonded bridging.

关键词： Ternary heterojunction Black phosphorus nanosheets Covalent bond Photocatalytic degradation Graphitic carbon nitride

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Can perfluorooctanoic acid be effectively degraded usingβ-PbO_(2)reactive electrochemical membrane?

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Chinese Chemical Letters 2024年第7期35卷 196-199页

作者： Xubin Qian Lei Xu Xu Ge Zhun Liu Cheng Fang Jianbing Wang junfeng niu College of Environmental Science and Engineering North China Electric Power UniversityBeijing 102206China College of Water Resources and Hydropower Engineering North China Electric Power UniversityBeijing 102206China Research Center for Eco-Environmental Engineering Dongguan University of TechnologyDongguan 523808China Global Centre for Environmental Remediation(GCER) University of NewcastleCallaghanNSW 2308Australia School of Chemical and Environmental Engineering China University of Mining and Technology(Beijing)Beijing 100083China

Aqueous perfluorooctanoic acid(PFOA)elimination has raised significant concerns due to its persistence and ***β-PbO_(2)plate anodes have shown efficient mineralization of PFOA,it remains unclear whether PFOA can be effectively degraded usingβ-PbO_(2)reactive electrochemical membrane(REM).Herein,we assessed the performance of Ti/SnO_(2)-Sb/La-PbO_(2)REM for PFOA removal and proposed a possible degradation *** a current density of 10 mA/cm2and a membrane flux of 8500(liters per square meter per hour,LMH),the degradation efficiency of 10 mg/L PFOA was merely8.8%,whereas the degradation efficiency of 0.1 mg/L PFOA increased to 96.6%.Although the porous structure of theβ-PbO_(2)REM provided numerous electroactive sites for PFOA,the generated oxygen bubbles in the pores could block the pore channels and adsorb PFOA *** hindered the protonation process and significantly impeded the degradation of high-concentration *** experiments indicated that·OH played dominant role in PFOA *** electrical energy per order to remove 0.1 mg/L PFOA was merely 0.74 Wh/L,which was almost an order of magnitude lower than that of other anode *** study presents fresh opportunities for the electrochemical degradation of low-concentration PFOA usingβ-PbO_(2)REM.

关键词： Perfluorooctanoic acid β-PbO_(2) Reactive electrochemical membrane Electrochemical oxidation

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Credible and Facile Fluorometric Detection of Soybean Trypsin Inhibitor Activity with a Water-Soluble Poly(diphenylacetylene) Derivative

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Transactions of Tianjin University 2024年第4期30卷 305-313页

作者： Jiao Tang Xiao Tang Jiaxiang Tang Wei Qi Qianwei Pan Jinhong Zeng Housheng Xia Jianping Zhou Zhongyi Sheng junfeng niu Zhejiang Tiantai Xianghe Industrial Co. Ltd.Taizhou 317200China Zhejiang Xianghe Track Fastener Research Institute Taizhou 317200China Shaoxing Institute for Food and Drug Control Shaoxing 312000China Key Laboratory of Chemical and Biological Processing Technology for Farm Products of Zhejiang Province School of Biological and Chemical EngineeringZhejiang University of Science and TechnologyHangzhou 310023China

Herein,a novel method for fl uorometric detection of soybean trypsin inhibitor(SBTI)activity based on a water-soluble poly(diphenylacetylene)derivative was *** quenching of the polymer via p-nitroaniline,produced from the trypsin-catalyzed decomposition of N-benzoyl-DL-arginine-4-nitroanilide hydrochloride(L-BAPA),was well described using the Stern-Volmer *** activity was quantitatively assessed based on changes in the fl uorescence intensity of the *** strategy has several advantages,such as high sensitivity and ease of ***,its applicability to other biochemical analyses is promising.

关键词： Fluorometric detection Soybean trypsin inhibitor Inhibition activity Fluorescence quenching

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Charge transport:through space keeps up with the pace

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Science China Chemistry 2015年第5期58卷 831-832页

作者： junfeng niu Jingzhi Sun Zhejiang University of Science & Technology Department of Polymer Science and Engineering Zhejiang University

Charge transport is a fundamental and crucial process in organic electronics. Modern understanding of the transport has shown that, on single molecule level, this process can be described by through bond （TB） and through space （TS） models. The quantitative deciphering of the TB process has been established in recent years by the aid of scanning tunneling microscope （STM） technique and by making use of a variety of well-defined conjugated rod-like molecules as conducting channels.

关键词：电荷传输空间扫描隧道显微镜分子水平模型描述导电通道 STM TB

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Photocatalytic degradation of fipronil in water by silver-modified lithium vanadium phosphate spheres under visible light irradiation

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Science China Chemistry 2015年第12期58卷 1912-1917页

作者： Lifeng Yin Lili Xie Yueping Bao junfeng niu State Key Laboratory of Water Environment Simulation

A novel visible light-driven photocatalyst, lithium vanadium phosphate sphere(LVPS), was prepared by a ball-milling method. For enhancing the photocatalytic performance, LVPS was further modified with silver(ALVPS) by a UV-light photo- reduction method. After modification, the crystalline phase of LVPS did not change, however, the UV-Vis diffuse reflectance spectrum of ALVPS was extended to 656 nm, which greatly improved its photoabsorptivity for visible light and enhanced its electron donating capacity. Under the irradiation of sunlight or visible light(>400 nm), ALVPS can rapidly remove fipronil(a persistent organic pollutant, 5 mg L?1) from aqueous solution. More than 99.7% of fipronil was removed by ALVPS after 0.5 h of irradiation, yielding a much higher removal rate than those achieved by nano-Ti O2 and Bi2O3. Photo-generated carrier trapping experiments were conducted to elucidate the photocatalytic degradation mechanism further. Hydrogen peroxide and potassium bromate suppressed the photocatalytic activity of ALVPS, while superoxide dismutase and sodium azide reinforced it, verifying that photo-generated electrons played a key role in the photochemical reaction.

关键词： lithium vanadium phosphate sphere visible light irradiation photocatalysis degradation

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Utilizing transparent and conductive SnO2 as electron mediator to enhance the photocatalytic performance of Z-scheme Si-SnO2-TiOx

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Frontiers of Environmental Science & Engineering 2020年第4期14卷 201-212页

作者： Jing Gu Hongtao Yu Xie Quan Shuo Chen junfeng niu Key Laboratory of Industrial Ecology and Environmental Engineering(Ministry of Education) School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China Research Center for Eco-Environmental Engineering Dongguan University of TechnologyDongguan 523808China

Z-scheme photocatalysts,with strong redox ability,have a great potential for pollutants ***,it is challenging to construct efficient Z-scheme photocatalysts because of their poor interfacial charge ***,by employing transparent and conductive SnO2 as electron mediator to pass light through and promote interfacial charge transportation,a novel Z-scheme photocatalyst Si-SnO2-TiOx(i

关键词： Z-scheme photocatalyst Tin oxide Electron mediator Organic pollutant

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Structural parameter optimization for novel internal-loop iron–carbon micro-electrolysis reactors using computational fluid dynamics

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Chinese Journal of Chemical Engineering 2019年第4期27卷 737-744页

作者： Lei Zhang Mengyu Wu Yanhe Han Meili Liu junfeng niu Department of Environmental Engineering Beijing Institute of Petrochemical Technology Beijing 102617 China Research Center for Eco-Environmental Engineering Dongguan University of Technology Dongguan 523808 China

It is generally recognized that internal-loop reactors are well-developed mass and heat-transfer multiphase flow reactors. However, the internal flow field in the internal-loop reactor is influenced by the structure parameter of the reactor, which has a great effect on the reaction efficiency. In this study, the computational fluid dynamics simulation method was used to determine the influence of reactor structure on flow field, and a volume-offluid model was employed to simulate the gas–liquid, two-phase flow of the internal-loop micro-electrolysis reactor. Hydrodynamic factors were optimized when the height-to-diameter ratio was 4:1, diameter ratio was9:1, draft-tube axial height was 90 mm. Three-dimensional simulations for the water distributor were carried out, and the results suggested that the optimal conditions are as follows: the number of water distribution pipes was four, and an inhomogeneous water distribution was used. According to the results of the simulation,the suitable structure can be used to achieve good fluid mechanical properties, such as the good liquid circulation velocity and gas holdup, which provides a good theoretical foundation for the application of the reactor.

关键词： Iron–carbon micro-electrolysis Internal cycling Computational fluid dynamics Structure design

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Insights into the electrochemical degradation of sulfamethoxazole and its metabolite by Ti/SnO_(2)-Sb/Er-PbO_(2) anode

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Chinese Chemical Letters 2020年第10期31卷 2673-2677页

作者： Yanping Wang Chengzhi Zhou Jinhua Wu junfeng niu School of Environment and Energy South China University of TechnologyGuangzhou 510006China Research Center for Eco-Environmental Engineering Dongguan University of TechnologyDongguan 523808China

Electrochemical degradation of sulfamethoxazole(SMX)and its metabolite acetyl-sulfamethoxazole(AcSMX)by Ti/SnO_(2)-Sb/Er-PbO_(2) were *** indicated that the electrochemical degradation of SMX and Ac-SMX followed pseudo-first-order *** rate constants of SMX and Ac-SMX were 0.268 and 0.072 min-1 at optimal curre nt density of 10 and 14 mA/cm^(2),*** products of SMX and Ac-SMX were identified and the possible degradation pathways,including the cleavage of S-N bond,opening ring of isoxazole and nitration of amino group,were *** organic carbon removal of SMX was nearly 63.2%after 3 h electrochemical degradation.22.4%nitrogen of SMX was trans formed to NO_(3)-,and 98.8%sulfur of SMX was released as SO_(4)2-.According to quantitative structureactivity relationship model,toxicities of SMX and Ac-SMX to aquatic organisms significantly decreased after electrochemical *** energy consumption for 90%SMX and Ac-SMX degradation was determined to be 0.58-8.97 and 6.88-44.19 Wh/L at different experimental conditions,*** with parent compound SMX,the metabolite Ac-SMX is more refractory and toxic,which emphasizes the importance of taking its metabolites into account when investigating the disposal of pharmaceuticals from wastewater.

关键词： Electrochemical degradation Sulfamethoxazole and metabolite Degradation mechanism Quantitative structure-activity relationship

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A high activity of Ti/SnO_2-Sb electrode in the electrochemicaldegradation of 2,4-dichlorophenol in aqueous solution

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Journal of Environmental Sciences 2013年第7期25卷 1424-1430页

作者： junfeng niu Dusmant Maharana Jiale Xu Zhen Chai Yueping Bao State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University School of Chemical and Environmental Engineering China University of Mining & Technology

Electrochemicaldegradation of2,4-dichlorophenol （2,4-DCP） in aqueous solutionwas investigated over Ti/SnO2-Sb anode. The factors influencing thedegradation rate, such as applied currentdensity （2-40 mA/cm2 ）, pH （3-11） and initial concentration （5-200 mg/L）were evaluated. Thedegradation of2,4-DCP followed apparent pseudo first-order kinetics. Thedegradation ratio on Ti/SnO2 -Sb anode attained 〉 99.9% after 20 min of electrolysis at initial 5-200 mg/L concentrations at a constant currentdensity of 30 mA/cm2 with a 10 mmol/L sodium sulphate （Na2SO4 ） supporting electrolyte solution. The results showed that 2,4-DCP （100 mg/L）degradation and total organic carbon （TOC） removal ratio achieved 99.9% and 92.8%, respectively, at the optimal conditions after 30 min electrolysis. Under this condition, thedegradation rate constant （k） and thedegradation half-life （t1/2 ）were 0.21 min1 and （2.8 ± 0.2） min, respectively. Mainly carboxylic acids （propanoic acid, maleic acid, propanedioic acid, acetic acid and oxalic acid） weredetected as intermediates. The energy efficiencies for2,4-DCPdegradation （5-200 mg/L）with Ti/SnO2-Sb anode ranged from 0.672 to 1.602 g/kWh. The Ti/SnO2-Sb anodewith a high activity to rapid organic oxidation could be employed todegrade chlorophenols, particularly2,4-DCP inwastewater.

关键词： 2 4-dichlorphenol Ti/SnO2 -Sb electrode electrochemicaldegradation total organic carbon

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