Biochar-Co3O4 composite activates peroxymonosulfate to degrade atrazine
CHEN Tian-ming1, CHEN Hao-ming1,2, MA Hong-yu1, TANG Ke-xin1, ZHAO Yan-wen1
1. College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China;
2. School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
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.
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