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Comparison of 1,2,3-Trichloropropane reduction and oxidation by nanoscale zero-valent iron, zinc and activated persulfate

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Journal of Groundwater Science and Engineering 2015年第2期3卷 156-163页

作者： LI Hui HAN Zhan-tao MA Chun-xiao GUI Jian-ye Institute of Hydrogeology and Environmental Geology CAGS Key laboratory of groundwater contamination remediation

Trichloropropane（TCP） is a chlorinated solvent which derives from chemical manufacturing as a precursor, and it is also an important constituent of solvent formulations in cleaning/degreasing operations. The control and remediation of TCP in polluted sites is a challenge for many conventional remediation techniques due to its refractory behaviour. This challenge in mind, some nano-materials and oxidants were tested to evaluate their effectiveness as in TCP degradation in a laboratory setting. Experimental results indicate that the use of nanoscale zero-valent iron prepared by green tea（GT） as a reductant has negligible degradation effect on TCP under normal temperature and pressure conditions. However, zinc powders of similar size but higher surface reactivity, demonstrated stronger dechlorination capacity in the breakdown of TCP, as almost all of TCP was degraded by carboxymethocel（CMC） stabilized nanoscale zinc within 24 h. activated persulfate by citric acid（CA） and chelated Fe（Ⅱ） was also used for TCP treatment with a TCP removal efficiency rate of nearly 50% within a 24 h reaction period, and a molar ratio of S2O82-, Fe2+ and CA is 20:5:1. Both the reduction and oxidation reactions are in accordance with the pseudo-first order kinetic equation. These results are promising for future use of TCP for the remediation of polluted sites.

关键词： 1,2,3-Trichloropropane Reduction Advanced oxidation Nanoparticles activated persulfate

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Heterogeneous activation of persulfate by CuMgAl layered double oxide for catalytic degradation of sulfameter

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Green Energy & Environment 2022年第1期7卷 105-115页

作者： Hongmin Zhang Qingzhu Jia Fangyou Yan Qiang Wang School of Marine and Environmental Science Tianjin Marine Environmental Protection and Restoration Technology Engineering CenterTianjin University of Science and TechnologyTianjin300457China School of Chemical Engineering and Material Science Tianjin University of Science and TechnologyTianjin300457China

In this study,a series of CuMgAl layered double oxides(CuMgAl-LDOs)were obtained via calcination of CuMgAl layered double hydroxides(CuMgAl-LDHs)synthesised via a co-precipitation *** results show that CuMgAl-LDO can be prepared using an optimal Cu:Mg:Al molar ratio of 3:3:2,NaOH:Na_(2)CO_(3)molar ratio of 2:1,and calcination temperature of 600°***-LDO is a characteristic of mesoporous material with a lamellar structure and large specific surface *** removal efficiency of sulfameter(SMD)based on CuMgAl-LDO/persulfate(PS)can reach>98%over a wide range of initial SMD concentrations(5–20 mg L^(-1)).The best removal efficiency of99.49%was achieved within 120 min using 10 mg L^(-1)SMD,0.3 g L^(-1)CuMgAl-LDO,and 0.7 mmol L^(-1)*** analysis showed that the degradation of SMD was in accordance with a quasi-first-order kinetic *** stability of the CuMgAl-LDO catalyst was verified by the high SMD removal efficiency(>97%within 120 min)observed after five recycling tests and low copper ion leaching concentration(0.89 mg L^(-1)),which is below drinking water quality standard of 1.3 mg L^(-1)permittable in the *** scavenging experiments suggest that SO_(4)^(-)is the primary active species participating in the CuMgAl-LDO/PS ***,our mechanistic investigations based on the radical scavenging tests and X-ray photoelectron spectroscopy(XPS)results indicate that Cu^((II))-Cu^((III))-Cu^((II))circulation is responsible for activating PS in the degradation of SMD and the degradation pathway for SMD was ***,the results presented in this work demonstrate that CuMgAl-LDO may be an efficient and stable catalyst for the activation of PS during the degradation of organic pollutants.

关键词： CuMgAl-LDO Heterogeneous catalysis activated persulfate Sulfameter Reaction mechanism

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Towards advanced removal of organics in persulfate solution by heterogeneous iron-based catalyst:A review

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Journal of Environmental Sciences 2024年第12期146卷 163-175页

作者： Baihui Cui Tingting Tian Luchun Duan Hongwei Rong Zhihua Chen Shiyi Luo Dabin Guo Ravi Naidu School of Civil Engineering Guangzhou UniversityGuangzhou 510006China Global Centre for Environmental Remediation(GCER) College of ScienceEngineering and EnvironmentThe University of NewcastleCallaghan NSW 2308Australia Cooperative Research Centre for Contamination Assessment and Remediation of the Environment(crcCARE) University DriveCallaghanNSW 2308Australia School of Environment Henan Normal UniversityXinxiang 453007China State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

Heterogeneous iron-based catalysts have drawn increasing attention in the advanced oxidation of persulfates due to their abundance in nature,the lack of secondary pollution to the environment,and their low cost over the last a few *** this paper,the latest progress in the research on the activation of persulfate by heterogeneous iron-based catalysts is reviewed from two aspects,in terms of synthesized catalysts(Fe0,Fe_(2)O_(3),Fe_(3)O_(4),FeOOH)and natural iron ore catalysts(pyrite,magnetite,hematite,siderite,goethite,ferrohydrite,ilmenite and lepidocrocite)focusing on efforts made to improve the performance of *** advantages and disadvantages of the synthesized catalysts and natural iron ore were *** interests were paid to the activation mechanisms in the catalyst/PS/pollutant system for removal of organic *** research challenges in the context of field application were also discussed.

关键词： activated persulfate Iron-based catalysts Iron ore-based catalysts Aactive free radicals Organic pollutants Heterogeneous catalysts

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Mesoporous amorphous FeOOH-encapsulated BiO_(2–x) photocatalyst with harnessing broad spectrum toward activation of persulfate for tetracycline degradation

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Chinese Journal of Chemical Engineering 2024年第7期71卷 235-248页

作者： Pengfei Wu Zhaolong Liu Li Wu Yingkun Zhang Bing Wang Zhanghao Cheng Wenquan Cui Xiangyang Lv Qingling Liu Tianjin Key Laboratory of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin UniversityTianjin 300350China Hebei Pollution Control Technology Innovation Center of Steel and Coking Industry Department of Environmental and Chemical EngineeringHebei College of Industry and TechnologyShijiazhuang 050091China Hebei Key Laboratory of Environmental Photocatalytic and Electrocatalytic Materials College of Chemical EngineeringNorth China University of Science and TechnologyTangshan 063210China Hebei Academy of Product Quality Supervision&Inspection Shijiazhuang 050227China

With the growing concern about the water environment,the advanced oxidation process of persulfate activation assisted by photocatalysis has attracted considerable attention to decompose dissolved organic *** this work,to overcome the drawbacks of the photocatalytic activity reduction caused by the photo-corrosion of non-stoichiometric BiO_(2–x),a novel material with amorphous FeOOH in situ grown on layered BiO_(2–x) to form a core-shell structure similar to popcorn chicken-like morphology was produced in two simple and environmentally beneficial *** a series of degradation activity tests of hybrid materials under different conditions,the as-prepared materials exhibited remarkable degradation activity and stability toward tetracycline in the FeOOH@BiO_(2–x)/Vis/PS system due to the synergism of photocatalysis and persulfate *** results of XRD,SEM,TEM,XPS,FTIR,and BET show that the loading of FeOOH increases the specific surface area and active sites appreciably;the heterogeneous structure formed by FeOOH and BiO_(2–x) is more favorable to the effective separation of photogenerated *** optimal degradation conditions were at a catalyst addition of 0.7 g·L^(–1),a persulfate concentration of 1.0 g·L^(–1),and an initial pH of 4.5,at which the degradation rate could reach 94.7%after 90 *** influence of typical inorganic anions on degradation was also *** studies and radical quenching experiments revealed that·OH,SO_(4)^(-)·,and·O_(2)^(-)were the principal active species generated during the degradation of *** results of the 1,10-phenanthroline approach proved that the effect of dissolved iron ions on the tetracycline degradation was limited,and the interfacial reaction that occurs on the active sites on the material's surface was a critical *** work provides a novel method for producing efficient broad-spectrum Bismuth-based composite photocatalysts and photocatalytic-activated persulfate synerg

关键词： Amorphous FeOOH BiO_(2–x) activated persulfate Photocatalytic Tetracycline degradation

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