炭基-Co<sub>3</sub>O<sub>4</sub>复合材料活化过一硫酸盐降解阿特拉津

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Abstract

Co₃O₄-biochar composite (Co-OB) was prepared by hydrothermal impregnation, and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and attenuated total reflection-infrared spectroscopy (ATR-IR). Degradation efficiency of atrazine (ATZ) was evaluated by Co-OB activated peroxymonosulfate (PMS). The effects of PMS concentration, humic acid (HA) and Cl^- on ATZ degradation were investigated. When 20μmol/L ATZ was treated by 0.025g/L Co-OB and 200μmol/L PMS in room temperature, a removal rate of ATZ at 86.3% was achieved within 10min. The efficiency of Co-OB/PMS oxidation of ATZ was 2.2times higher than the sum of that in biochar (OB) and Co₃O₄ activation. The ATZ removal rate was significantly increased with increasing PMS concentration. Presence of Cl^- and HA played negative effects on the degradation of ATZ, and the inhibitory effect was more obvious as the concentration of Cl^- and HA increased. The radical scavenging experiments showed that ·OH and SO₄·^- played a dominant role in ATZ degradation. Six transformation intermediates were documented by liquid chromatography-mass spectrometry (LC-MS), and a degradation pathway of ATZ during Co-OB/PMS oxidation was presumed. The stability experiments showed that Co-OB was reusable corresponding with low Co²⁺ dissolution.

Key words： biochar Co₃O₄ atrazine influence factors degradation mechanism

Received: 28 March 2020

PACS:

X703.5

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	Articles by authors
	CHEN Tian-ming
	CHEN Hao-ming
	MA Hong-yu
	TANG Ke-xin
	ZHAO Yan-wen

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CHEN Tian-ming,CHEN Hao-ming,MA Hong-yu等. Biochar-Co₃O₄ composite activates peroxymonosulfate to degrade atrazine[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(11): 4786-4794.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I11/4786

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