Efficient activation of peroxymonosulfate for catalytic degradation of organic pollutants by simultaneously using low-level cobalt ions and calcium carbonate micro-particles  

作　　者：Yu Zhou Xiaobo Wang Nan Wang Shuangshuang Huang Lihua Zhu 

机构地区：[1]College of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Wuhan 430074,China [2]College of Chemistry and Chemical Engineering,Hubei Polytechnic University,Huangshi 435003,China [3]College of Chemistry and Environmental Engineering,Wuhan Polytechnic University,Wuhan 430023,China [4]School of Physics and Technology,Center for Electron Microscopy,Wuhan University,Wuhan 430072,China

出　　处：《Journal of Environmental Sciences》2025年第5期113-124,共12页环境科学学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(Nos.22076052 and 21976063);China Postdoctoral Science Foundation(No.2018M642850);the Research Funding of Wuhan Polytechnic University(No.2023RZ017).

摘　　要：An efficient catalytic system was developed to remove various organic pollutants by simultaneously using low-level cobalt ions,calcium carbonate micro-particles and peroxymonosulfate(PMS).A simple base-induced precipitation was used to successfully loaded Co-centered reactive sites onto the surface of CaCO_(3)microparticles.Under optimal conditions at 25°C,10 mg/L methylene blue(MB)could be completely degraded within 10 min with 480μg/L Co^(2+),0.4 g/L CaCO_(3)microparticles(or 0.4 g/L Co@CaCO_(3))and 0.1 g/L PMS.The MB degradation followed the pseudo first order kinetics with a rate constant of 0.583 min^(−1),being 8.3,11.5 and 53.0 times that by using Co-OH(0.07 min^(−1)),Co^(2+)(0.044 min^(−1))and CaCO_(3)(0.011 min^(−1))as the catalyst,respectively.It was confirmed that there was a synergistic effect in the catalytic activity between Co species and the CaCO_(3)particles but the major contributor was the highly dispersed Co species.When Co^(2+)-containing simulated electroplating wastewater was used as the Co^(2+)source,not only the added MB was also completely degraded within 5 min in this catalytic system,but also the coexisting heavy metal ions were substantially removed.The presently developed method was applied to simultaneously treat organic wastewater and heavy metals wastewater.The present method was also successfully used to efficiently degrade other organic pollutants including bisphenol A,sulfamethoxazole,rhodamine B,tetrabromobisphenol A,ofloxacin and benzoic acid.A catalytic mechanism was proposed for the PMS activation by Co@CaCO_(3).The surface of CaCO_(3)particles favors the adsorption of Co^(2+).More importantly,the surface of CaCO_(3)particles provides plentiful surface-OH and-CO_(3)^(2+),and these surface groups complex with Co^(2+)to producemore catalytically active species such as surface[CoOH]^(−),resulting in rapid Co^(2+)/Co^(3+)cycling and electron transfer.These interactions cause the observed synergistic effect between Co species and CaCO_(3)particles in PMS activation.Du

关 键 词：CACO3 Low-level cobalt PEROXYMONOSULFATE Oxidative degradation 

分 类 号：X703[环境科学与工程—环境工程]