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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第2期    总第258期    2016年2月

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文章编号:1672-7207(2016)02-0697-06
填充床电极反应器在不同电解质中有机物电催化氧化的电容特性
李鹏1,赵跃民2,王立章2,张波2

(1. 东华理工大学水资源与环境工程学院,江西南昌,330013;
2. 中国矿业大学环境与测绘学院,江苏徐州,221116
)

摘 要: 研究填充床电极反应器电催化氧化有机物过程中在不同电解质溶液(酸性(H2SO4),碱性(KOH)和中性(Na2SO4))中的电容特性,分别采用循环伏安(CV)、恒流充放电(GCD)及电化学阻抗(EIS)测试进行电容特性表征、比电容(Cs)计算及相应动力学分析。研究结果表明:在酸性、碱性及中性条件下,填充床电极反应器有机物电催化过程均表现出一定的电容特性,3种电解质溶液电化学反应过程产生比电容由大到小顺序为酸性、碱性、中性;Cs及稳定性由不同介质类型中有机物电催化降解特性及电解质离子与阳极和炭电极间的迁移特性而决定。酸性溶液中较小的液相电阻(Rs,3.01 Ω)使有机物氧化易于进行,而较小的电荷传递电阻(Rct,1.08 Ω)有利于离子/电荷在阳极和炭电极表面的迁移,产生比电容较大,但由于电催化反应强烈,电容循环稳定性差;碱性溶液中Rs(4.22 Ω)和Rct(3.13 Ω)较大,有机物的氧化分解反应显著降低,比电容较小,然而此时电容效应循环性能较好;中性电解质中有机物电催化氧化难易程度介于二者之间(Rs为3.63 Ω),苯酚氧化生成的聚合衍生物使其Rct(3.79 Ω)增大,产生的比电容最小。

 

关键词: 电解质;填充床电极反应器;有机物电催化氧化;电容特性

Capacitance performance of packed-bed electrochemicalreactor toward organic matter electro-oxidation in different electrolytes
LI Peng1, ZHAO Yuemin2, WANG Lizhang2, ZHANG Bo2

1. School of Water Resource and Environmental Engineering, East China University of Technology, Nanchang 330013, China;
2. School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China

Abstract:Capacitance performance of packed-bed electrochemical reactor toward organic matter electro-oxidation in acidic (H2SO4), alkaline (KOH) and neutral (Na2SO4) electrolytes was studied. The characterization of capacitance behavior, calculation of the specific capacitance (Cs) and corresponding kinetic analysis were investigated by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) techniques, respectively. The results show that capacitance behavior is presented during the organic matter electro-oxidation process in a packed-bed electrochemical reactor in aqueous solutions, and the order of the excited Csis acidic, alkaline and neutral. The Cs and its retention are ascribed to the discrepant oxidation ability among various electrolyte solutions and ion/charge migration behavior on anode and carbon electrodes. In acidic electrolyte, for the reason of a smaller electrolyte resistance (Rs, 3.01 Ω) and charge transfer resistance (Rct, 1.08 Ω) the electro-oxidation of organic matter is realized easily with simultaneous of a higher Cs caused by less obstruction for ion diffusion on anode and carbon electrodes. An inferior performance of Cs stability comes out for the obvious organics degradation reaction. Nevertheless, in alkaline solution, greater Rs 4.22 Ω and Rct3.13 Ω are devoted to less degradation of organic matter and a lower Cs, but itsattenuation is not significant. The complexity for organic matter elimination in neutral solution is sandwiched between acidic and alkaline(Rs is 3.63 Ω), however, for the reason of the derived polymeric film attached on anode and carbon electrode surface, it possesses the largest Rct (3.79 Ω), accompanied by the minimum Cs.

 

Key words: electrolytes; packed-bed electrochemical reactor; organic matter electro-oxidation, capacitance performance

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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