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Peroxymonosulfate decomposition by homogeneous and heterogeneous Co: Kinetics and application for the degradation of acetaminophen

查看全文 作　　者：Oscar M.Rodríguez-[1]Narvaez;Ruwini [2]D.Rajapaksha;Mahinda [2]I.Ranasinghe;Xuelian [3]Bai;Juan Manuel Peralta-[1]Hernández;Erick [3]R.Bandala 高影响力作者 机构地区：[1]Departamento de Química,DCNE,Universidad de Guanajuato,Guanajuato C.P.3C6040,Mexico;[2]Department of Chemistry,New Mexico Institute of Mining and Technology,Socorro,NM 87801,USA;[3]Division of Hydrologic Sciences,Desert Research Institute,Las Vegas,NV 89119-7363,USA高影响力机构 出　　处：《Journal of Environmental Sciences》索引2020年第32卷第7期,共11页高影响力期刊 基　　金：the economic support of Universidad de Guanajuato,(Grant No.18,Convocatoria Institucional de Apoyo a la Investigación Científica 2018);CONACyT for a graduate fellowship(Grant No.562419)。 摘　　要：Peroxymonosulfate(PMS)decomposition,hydroxyl radical(·OH)generation,and acetaminophen(ACT)degradation by the Co/PMS system using homogeneous(dissolved cobalt)and heterogeneous(suspended Co3O4)cobalt were assessed.For the homogeneous process,>99%PMS decomposition was observed and 10 mmol/L of·OH generation was produced using 5 mmol/L of PMS and different dissolved cobalt concentrations after 30 min.A dissolved cobalt concentration of 0.2 mmol/L was used to achieve>99%ACT degradation using the homogeneous process.For the heterogeneous process,60%PMS decomposition and negligible·OH generation were observed for 5 mmol/L of the initial PMS concentration using 0.1 and 0.2 g/L of Co3O4.Degradation of ACT greater than 80%was achieved for all experimental runs using 5 mmol/L of the initial PMS concentration independently of the initial Co3O4 load used.For the heterogeneous process,the best experimental conditions for ACT degradation were found to be 3 mmol/L of PMS and 0.2 g/L of Co3O4,for which>99%ACT degradation was achieved after 10 min.Because negligible·OH was produced by the Co3O4/PMS process,a second-order kinetic model was proposed for sulfur-based free radical production to allow fair comparison between homogeneous and heterogeneous processes.Using the kinetic data and the reaction by-products identified,a mechanistic pathway for ACT degradation is suggested. 关 键 词：CO3O4 PMS decomposition Fenton-like reaction ACETAMINOPHEN ·OH production
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