石墨烯三维电极-电Fenton系统降解甲基橙

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Abstract Three-dimensional electrode and electric Fenton system were combined to degrade methyl orange wastewater with the method of electrocatalytic oxidation degradation. Fe₃O₄ loaded graphene oxide particle electrode GO@Fe₃O₄ (GF) and spherical gel structure SA/GO@Fe₃O₄ (SGF) particle electrode were made by our research group. Then, the two kinds of particle electrodes were characterized, the influence factors of electrocatalytic oxidation performance by three-dimensional electrode-electro Fenton (3D-EF) system were discussed and the reaction kinetic analysis was carried out. Based on the design of Box-Benhnken central composite response surface, the response surface quadratic multiple regression equation model was established. The degradation process of methyl orange was studied by UV-vis and GC-MS. There was three-dimensional network fold structure on the surface of SGF particle electrode. Under the reaction conditions, namely initial pH=5, particle electrode dosage 3.0g/L, reaction time 90min, current density 30mA/cm²and applied voltage 7V, the removal efficiencies of methyl orange chromaticity and COD of SGF particle electrode system were 98.8% and 87.5% respectively, which were higher than that of GF particle electrode system, which were 87.2% and 71.2% respectively. Based on the present study, the reaction conditions and the removal efficiency of methyl orange chromaticity predicted by the response surface model were consistent with the experimental results. The speculated degradation process of methyl orange can be divided into three stages:bond breaking oxidation process, ring opening process and complete oxidation process.

Key words： particle electrode graphene response surface method kinetics

Received: 12 February 2020

PACS:

X703.5

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	Articles by authors
	XU Bin
	ZHANG Shu-ling
	GAO Yue-xiang
	ZHANG Yi-min
	FENG Jin-cai

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XU Bin,ZHANG Shu-ling,GAO Yue-xiang等. Degradation of methyl orange by graphene three-dimensional electrode-electro Fenton system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(10): 4385-4394.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I10/4385

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