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Synthesis of nano SnO2-coupled mesoporous molecular sieve titanium phosphate as a recyclable photocatalyst for efficient decomposition of 2,4-dichlorophenol

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Nano Research 2018年第3期11卷 1612-1624页

作者： Yanduo Liu Ning Sun Shuangying Chen Rui Yan Peng Li Yang Qu Yichun Qu Liqiang Jing Key Laboratory of Functional Inorganic Materials Chemistry Heilongjiang University Ministry of Education School of Chemistry and Materials Science International 2oint Research Center for Catalytic Technology Heilongjiang University Harbin 150080 China

It is essential to develop a cheap, recyclable, and efficient photocatalyst to help degrade pollutants contaminating the environment. Herein, mesoporous molecular sieve titanium phosphate （MMS-TiP） was used as an efficient nano-photocatalyst to degrade 2,4-dichlorophenol （2,4-DCP） and to oxidize CO. The catalyst was successfully synthesized by a simple and convenient hydrothermal method in the presence of a tri-block copolymer surfactant. Exceptional photoactivity of the optimized MMS-TiP mainly depends on its porous structure, with a large surface area by means of O2 temperature-programmed desorption curves and fluorescence spectra related to the amounts of produced hydroxyl radical. Interestingly, the photocatalytic activity of the prepared MMS-TiP could be greatly improved by coupling with nanocrystalline SnO2. This is likely due to the increase in the lifetime and separation of photogenerated charges by transferring electrons to SnO2 and was observed by steady-state surface photovoltage spectra and time-resolved surface photovoltage responses. The SnOa-coupled MMS-TiP exhibits better photocatalytic performance for 2,4-DCP degradation and better self-settlement than those of the commercial catalyst P25 TiO2. Moreover, it was confirmed by radical-trapping experiments that ·O2^- is the main activated species for the photocatalytic degradation of 2,4-DCP, and is photogenerated by electron transfer from MMS-TiP to SnO2. Furthermore, the main intermediates in the degradation of 2,4-DCP, like parachlorophenol superoxide and 1,2-benzenediol superoxide radicals, were detected, and a possible decomposition pathway related to ·O2^- attack is proposed. These experimental results provide new strategies for developing a recyclable molecular sieve- based nano-photocatalyst with high photocatalytic activity for environmental remediation.

关键词： mesoporous molecular sieve titanium phosphate coupling SnO2 charge separation photocatalysis 2 4-dichlorophenol decomposition

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A Fiber Optic Sensor for 2,4-dichlorophenol Analysis based on Optical Composite Oxygen-sensitive Film

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Journal of Wuhan University of Technology(Materials Science) 2020年第4期35卷 743-749页

作者： TONG Yilin ZENG Zhihong YU Kan BAO Jiaqi YIN Juanjuan Information Science and Technology Department Wenhua CollegeWuhan 430074China

A novel fiber optic sensor based on optical composite oxygen-sensitive film was developed for determination of 2,4-dichlorophenol(DCP).The optical composite oxygen-sensitive film consists of tris(2,2’-bipyridyl)dichloro ruthenium(II)hexahydrate(Ru(bpy)3Cl2)as the fluorescence indicator and iron(III)tetrasulfophthalocyanine(Fe(III)PcTs)as bionic enzyme.A lock-in amplifier was used for detecting the lifetime of the composite oxygen-sensitive film by measuring the phase delay of the sensor *** different variables affecting the sensor performance were evaluated and *** the optimal conditions(i e,pH 6.0,25℃,Fe(III)PcTs concentration of 5.0×10^-5 mol/L),the linear detection range,detection limit and response time of the fiber optic sensor are 3.0×10^-7-9.0×10^-5 mol/L,4.8×10^-8 mol/L(S/N=3),and 220 s,*** sensor displays high selectivity,good repeatability and stability,which have good potentials in analyzing DCP concentration in practical water samples.

关键词： 2 4-dichlorophenol optical composite oxygen-sensitive film fiber optic sensor phase delay

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Fabrication of bimetallic nanoparticles modified hollow nanoporous carbons derived from covalent organic framework for efficient degradation of 2,4-dichlorophenol

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Chinese Chemical Letters 2021年第8期32卷 2529-2533页

作者： Yanshu Zhang Gongke Li Yufei Hu School of Chemistry Sun Yat-sen UniversityGuangzhou 510275China

Bimetallic nanoparticles modified hollow-structured nanoporous carbons(NPCs) have been fabricated via a convenient one-step carbonizing strategy derived from covalent organic *** Pd/Fe/NPCs,Pt/Fe/NPCs and Rh/Fe/NPCs were obtained and can be used as Fenton-like catalysts with good stability and *** catalytic activity was evaluated by the degradation of2,4-dichlorophenl(2,4-DCP).These fabricated bimetallic catalysts exhibited much higher catalytic activity than Fe/NPCs at room *** enhancement of catalytic ability was benefited from synergetic catalytic effect of bimetallic nanoparticles and accelerated mass transfer of hollow ***,the enhanced catalytic mechanism of bimetallic catalysts was studied in detail and the reasonable reaction pathway was ***,the bimetallic catalysts were successfully used for degradation of 2,4-DCP in actual industrial wastewater and the removal efficiency could reach 74.3%within 120 min,which demonstrated the promising potential application of bimetallic catalysts in the removal of pollutants in environment.

关键词： Covalent organic framework Hollow structure N-doped carbon Bimetallic nanoparticles 2 4-dichlorophenol Degradation

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Plasma-Catalytic Decomposition of 2,4-dichlorophenol in a Dielectric Barrier Discharge with a Vermiculite ZiO2 Composite

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Advances in Chemical Engineering and Science 2023年第4期13卷 318-335页

作者： Grigoriy I. Gusev Andrey A. Gushchin Vladimir I. Grinevich Ekaterina M. Baburina Ekaterina S. Severgina Natalya E. Gordina Department of Industrial Ecology Ivanovo State University of Chemical Technology Ivanovo Russia Department of Technology of Inorganic Substances Ivanovo State University of Chemistry and Technology Ivanovo Russia

The paper presents comparative kinetic characteristics of the decomposition of 2,4-dichlorophenol in a dielectric barrier discharge and a combined plasma-catalytic process. Vermiculite containing 5% zirconium was used as a catalyst. The destruction processes of 2,4-DCP proceed efficiently, the degree of decomposition increases in the combined plasma-catalytic process by a factor of 1.33 and reaches 80%. The experimental results were processed according to the first-order kinetic law (R2 > 0.97), according to which the effective constants (0.36 ± 0.04) and (0.51 ± 0.03) s-1 and the decomposition rates of 2,4-DCP (106 and 123 μmol/l·s) when treating model solutions without a catalyst and with vermiculite + Zr 5%, respectively, and the energy costs are 0.012 and 0.017 molecules/100eV. The main decomposition products present in the solution have been determined to be carboxylic acids, aldehydes, the contribution of which does not exceed 2%, as well as chloride ions, and in the gas phase they are carbon dioxide and molecular chlorine (the share of which does not exceed 1.5% of total chlorine content in the system).

关键词： 2 4-dichlorophenol Dielectric Barrier Discharge Plasma Oxygen Treatment Water Treatment Catalyst Zirconium Vermiculite

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Characterization of nanoscale iron and its degradation of 2,4-dichlorophenol

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Science Bulletin 2010年第Z1期 350-357页

作者： HOU ChunFeng1,2, GE XiaoPeng1, ZHOU YanMei2, LI Yi3, WANG DongSheng1 & TANG HongXiao1 1 State Key Laboratory of Environmental Aquatic Chemistry, RCEES, Chinese Academy of Sciences, Beijing 100085, China 2 School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China 3 Nanotechnology Center, Central Iron and Steel Research Institute, Beijing 100081, China

Nanoscale iron was detected by TEM, X-ray diffraction and X-ray photoelectron spectroscopy. It was found that the size of the nanoscale iron particles is in the range of 30?40 nm according to TEM image, and it contains abundant Fe3O4 as passivating layers on the surface of the core-shell structure. To improve its performance, dilute HCl was used for the removal of the passivating layers, and the degradation of 2,4-dichlorophenol (2,4-DCP) was measured for the nanoscale iron samples treated and untreated. Experimental results demonstrated that the removal of 2,4-DCP by untreated nanoscale iron is mainly due to the adsorption of 2, 4-DCP by nanoscale iron, and there are no degradation products detected by HPLC in the process. However, excellent dechlorination of 2,4-DCP was gained by HCl-treated nanoscale iron, and 2-chlorophenol, 4-chlorophenol and phenol were detected during the process. It was concluded that dechlorination is the key reaction pathway for the degradation of 2,4-DCP by activated nanoscale iron, and phenol is found to be the main product.

关键词： nanoscale iron 2 4-dichlorophenol degradation dechlorination

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HPLC and GC methods development for the analysis of key intermediate for synthesis of dicamba

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Chinese Journal of Chemical Engineering 2021年第5期34卷 112-117页

作者： Zhenming Zhang He Zhao Xiaohui Wang Weiming Ni Fengsheng Gao Jianrong Wang Minjin Liu Yongli Li Key Laboratory of Power Station Energy Transfer Conversion and System Ministry of EducationNorth China Electric Power UniversityBeijing 102206China Jiangsu Changqing Agrochemical Co. Ltd.Yangzhou 225200China Jiangsu Changqing Agrochemical Nantong Co. Ltd.Nantong 226000China

The microreactor based hydroxylation process of 1,2,4-trichlorobezene for producing 2,5-dichlorphenol,the key intermediate of dicamba,is energy efficient and cost *** the 2,5-dicholorphneol is present in a mixed state after *** reaction mixture contained the main by-product 2,4-dichlorophneol,low-content by-product 3,4-dichlorophneol,and other *** difficulty in separation and analysis limits the application of this process *** current work aimed at establishing effective analysis methods by gas chromatography(GC)and high performance liquid chromatography(HPLC).The GC method was not able to separate 2,5-dichlorophenol and 2,4-dichlorophenol completely,but the developed HPLC method worked *** linear correlation coefficients of 2,5-dichlorophenol and 2,4-dichlorophenol were both higher than 0.999,and the average recovery was 100.33% for 2,5-dichlorophenol and 100.13% for 2,4-dichlorophenol,*** relative standard deviations from precision tests were both less than 1%.The contents of 2,5-dichlorophenol and 2,4-dichlorophenol were determined with external standard *** HPLC method has the advantages of simple operation,good separation efficiency,high accuracy and precision,and was successfully applied for both qualitative and quantitative analysis of 2,5-dichlorophenol and 2,4-dichlorophenol of the sample solution.

关键词： 2 5-dichlorophenol 2 4-dichlorophenol Chromatography Separation Chemical analysis

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Photodegradation of dye pollutants on TiO_2 pillared bentonites under UV light irradiation

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Science China Chemistry 2002年第4期45卷 445-448页

作者：李静谊朱怀勇丁哲陈春城赵进才 Centre for Molecular Science Institute of Chemistry Chinese Academy of Sciences Beijing China Nanomaterials Centre and Department of Chemical Engineering University of Queensland Australia

TiO2 pillared bentonite samples dried under different conditions are used to degrade 2,4-dichlorophenol and orange II under UV light irradiation. The supercritical dried sample exhibits a high activity for the photodegradation of 2,4-dichlorophenol and orange II due to its structural features. TOC and COD are measured during the degradation of 2,4-dichlorophenol under UV light irradiation using P25 and TiO2 pillared bentonite samples dried under different conditions. The clay-based catalysts can be readily separated by filtration or sedimentation.

关键词： TiO2 pillared clays 2 4-dichlorophenol orange II UV light irradiation.

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Quantum Chemical and Kinetic Study on Dioxin Formation from the 2,4,6-TCP and 2,4-DCP Precursors

Quantum Chemical and Kinetic Study on Dioxin Formation from ...

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中国化学会第27届学术年会

作者：高锐郁万妮张庆竹 Environment Research Institute Shandong University

＜正＞This study focuses on the homogeneous gas-phase formation of polychlorinated dibenzo-p-dioxins （PCDDs） and dibenzofurans （PCDFs） from the 2,4,6-trichlorophenol （2,4,6-TCP） and 2,4-dichlorophenol

关键词： 2 4 6-trichlorophenol 2 4-dichlorophenol PCDD/F formation Reaction mechanism Rate constants

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