LaCo0.5Cu0.5O3型钙钛矿活化过一硫酸盐降解AO7

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Abstract

LaCo_1-xM_xO₃(M=Cu、Fe、Mn) perovskite was prepared by sol-gel method, and then used to activate peroxymonosulfate (PMS) to decolorize azo dye orange 7 (AO7). LaCo_0.5Cu_0.5O₃ perovskite was found to show the best catalytic effect on PMS activation for AO7 decolorization. The effects of LaCo_0.5Cu_0.5O₃ dosage, PMS concentration, pH value and common ions (e.g., Cl^-) in dye wastewater were further evaluated on the degradation of AO7 in LaCo_0.5Cu_0.5O₃/PMS system. Results show that the degradation of AO7 was accelerated with the increase of LaCo_0.5Cu_0.5O₃ dosage and PMS concentration. Neutral pH was most favorable for the degradation of AO7, and the degradation of AO7 was inhibited under acidic or alkaline conditions. AO7 can be completely degraded in 20min at the optimal operating conditions of 20mg/L LaCo_0.5Cu_0.5O₃, 0.50mmol/L PMS and 0.05mmol/L AO7. The reaction mainly occurred on the surface of the catalyst and ·OH was the main active species responsible for AO7 degradation. Overall, LaCo_0.5Cu_0.5O₃ exhibits excellent performance on PMS activation to decolorize and mineralize AO7.

Key words： LaCo_0.5Cu_0.5O₃ perovskite peroxymonosulfate acid orange 7 hydroxyl radicals

Received: 26 August 2019

PACS:

X703

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	Articles by authors
	XU Jie
	CHEN Jia-bin
	LU Jian
	DI Xin
	DING Cong
	WANG Ke-qing
	HUANG Tian-yin

Cite this article:

XU Jie,CHEN Jia-bin,LU Jian等. Degradation of azo dye AO7 with peroxymonosulfate catalyzed by LaCo_0.5Cu_0.5O₃ perovskite[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(3): 1123-1131.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I3/1123

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