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Degradation of AO7 with peroxymonosulfate catalyzed by Co-C-N single atom |
XU Jie1,2, WANG Ke-qing1, TIAN Dan1, WU Mei1, LI Si-jia1, BAO Xiu-min1, XU Xiao-yi1 |
1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215000, China; 2. Sinosteel Tiancheng Environmental Protection Science & Technology Co., Ltd, Wuhan 430080, China |
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Abstract Monoatomic Co-C-N catalyst was synthesized by a template etching method and then was used to activate peroxymonosulfate (PMS) for degradation of decolorize azo dye orange 7 (AO7). The effects of catalyst dosage, PMS concentration, pH value of reaction medium and Cl- commonly exists in dye wastewater on the removal of AO7 in Co-C-N/PMS system were systematically evaluated. The reaction mechanism was inferred, the mineralization ability and the reuse of catalyst were investigated. Experimental results showed that Co-C-N can effectively activate PMS to degrade AO7, and the reaction rate for AO7 removal can be accelerated with an increase in Co-C-N dosage and PMS concentration. AO7 can be removed effectively in the range of pH=3.0 to 9.0. When the concentration of Co-C-N dosage、the PMS and AO7 concentration were 50mg/L、1.0mmol/L and 0.05mmol/L respectively, AO7 can be completely removed within 10min under a neutral condition. SO4·- produced by PMS activation of heterogeneous system was the main active species for the degradation of AO7, and 1O2 produced by C-induced PMS was also involved in the degradation reaction through non-free radical system. The oxidation reaction mainly occurs on the surface of the catalyst. Co-C-N/PMS system has excellent removal ability and strong mineralization effect for AO7. Compared with the single Co-C-N adsorption process of AO7, Co-C-N/PMS system not only can increases the reaction rate, but also greatly improves the recyclability of the catalyst.
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Received: 15 May 2020
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