Kun Zhao

Liu Yanming

Quan Xie

English

University of Szeged

Electro-Fenton Reaction by Porous Carbon Based Electrocatalysts for Water and Wastewater Treatment  Xie Quan*, Yanming Liu, Kun, Zhao School of Environmental Science and Technology, Dalian University of Technology,  116024 Dalian, China E-mail: quanxie@dlut.edu.cn  Electro-Fenton is a promising method to treat persistent organic pollutants in wastewater. In the process of electro-Fenton, the H2O2 are produced by electrochemical reduction of O2 via two-electron pathway, and the generated H2O2 are catalyzed by Fe2+ to produce highly reactive •OH radical. The efficiency of pollutant degradation is highly dependent on the cathode catalysts for H2O2 generation. The selectivity towards H2O2 production from O2 reduction is related to the adsorption energy of the •OOH intermediate on electrocatalysts surface. Carbon-based materials are attractive catalysts for H2O2 production due to their good electrical conductivity, excellent stability, low cost and the tunable surface properties. The adsorption properties of •OOH intermediate on carbon-based materials can be tuned by incorporation of defect or heteroatom (N, S, B, F), which breaks the integrity of π conjugation system and induce charge redistribution, thus facilitating H2O2 generation. Herein, adsorption properties of •OOH intermediate on porous carbon materials was controlled by doping sp3-C or F species. The resultant carbon-based material exhibited significantly enhanced catalytic activities for electrochemical synthesis of H2O2. Benefited from the high H2O2 production rate (44.2-41.2 mmol L-1 h-1), atrazine and perfluorooctanoate was rapidly degraded by electro-Fenton with first-order kinetic constant of 11.2 h-1 and 1.15 h-1 (-0.4 V vs.SCE, pH of 2), respectively. The real secondary effluent was successfully treated to meet the National Standard for wastewater Discharge of China (COD < 50 mg L-1) with a low specific energy consumption of 6.38 kWh kg-1 COD-1. Our works provided a new insight into the preparation of high-efficiency metal-free catalysts for electro-Fenton degradation of organic pollutants. 91

Electro-fenton reaction by porous carbon based electrocatalysts for water and wastewater treatment

http://acta.bibl.u-szeged.hu/76840/1/npm_005_paot_006_091.pdf

Electro-fenton reaction by porous carbon based electrocatalysts for water and wastewater treatment

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University of Szeged