基于PMS的Cr(VI)-染料复合废水协同处理效果及机理

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Abstract This article investigated the feasibility, influencing factors and mechanism of the synergistic treatment of azo dyes Ⅱ (AO7) and Cr (VI) by adding persulfate (PMS). The results showed that the system could reduce the Cr (VI) and remove AO7 simultaneously and the degradation rate reached 97.9% and 22.1% at 120 minutes, respectively. AO7 degradation and Cr (VI) removal efficiency increased gradually with the decrease of initial pH. The degradation of AO7 was mainly because of the combined functions of the oxidizing substance HClO produced when Cl^- reacts with PMS and the strong oxidizer Cr (VI) in acidic condition created by PMS. Among these two functions, HClO played the dominant role. In addition, the conversion of Cr (VI) was caused by the redox reaction between itself and AO7. Thus, this research could provide a theoretical basis for the treatment of compound polluted wastewater.

Key words： dye wastewater compound pollution persulfate Cr(VI) synergistic treatment

Received: 25 February 2019

PACS:

X703

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	Articles by authors
	YAN Song
	ZHANG Cheng-wu
	LI Tian-yi
	QIN Chuan-yu

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YAN Song,ZHANG Cheng-wu,LI Tian-yi等. Synergistic treatment effect and mechanism of Cr(VI)-dye complex wastewater based on PMS[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(8): 3271-3276.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I8/3271

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