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Article: Efficient Degradation of Sulfamethazine with CuCo2O4 Spinel Nanocatalysts for Peroxymonosulfate Activation

TitleEfficient Degradation of Sulfamethazine with CuCo2O4 Spinel Nanocatalysts for Peroxymonosulfate Activation
Authors
KeywordsCuCo2O4 catalyst
Peroxymonosulfate
Sulfamethazine
Advanced oxidation
Issue Date2015
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/cej
Citation
Chemical Engineering Journal, 2015, v. 280, p. 514-524 How to Cite?
AbstractCuCo2O4 spinel nanoparticles (NPs) synthesized using a solvothermal method were used as catalysts to activate peroxymonosulfate (PMS) with sulfamethazine (SMZ) as the target pollutant. A degradation efficiency of 87.2% was achieved in 20min with 20mgL-1 PMS and 0.01gL-1 CuCo2O4 catalyst. In contrast, only 51.1%, 11.3%, 12.5%, and 7.9% degradations of SMZ were observed with Co3O4, CuFe2O4, CuO, and Fe3O4, respectively, as the catalysts. The superior catalytic reactivity of CuCo2O4 was explained with the presence of Co2+ on the catalyst surface and the combined catalytic reactivity of copper and cobalt towards PMS. Based on the XPS results and the relative catalytic reactivity of Cu2+ and Cu+, it was proposed that the Cu2+/Cu+ circulation was least likely the key reaction steps. Instead, a complex reaction mechanism involving the generation of Cu3+ was used to explain the activation of PMS by Cu2+. The investigation on the reaction parameters showed that the SMZ degradation efficiency responded positively to increases in the PMS dose and the scavenger effect. A mild alkaline condition favored the degradation of SMZ, and an optimized operational condition was found to achieve 98% SMZ degradation with 20mgL-1 PMS, 0.04gL-1 CuCo2O4, and 5mgL-1 SMZ at pH 7.7. The activation energy of SMZ degradation was thus estimated to be 21.0kJmol-1 for the CuCo2O4/PMS system and 38.4kJmol-1 for the CuFe2O4/PMS system. Finally, a degradation mechanism on the basis of analyzing the degradation products of SMZ was proposed and the stability and reusability of the CuFe2O4 NPs were evaluated.
Persistent Identifierhttp://hdl.handle.net/10722/215253
ISSN
2019 Impact Factor: 10.652
2015 SCImago Journal Rankings: 1.743
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorFeng, Y-
dc.contributor.authorLiu, J-
dc.contributor.authorWu, D-
dc.contributor.authorZhou, Z-
dc.contributor.authorDeng, Y-
dc.contributor.authorZhang, T-
dc.contributor.authorShih, K-
dc.date.accessioned2015-08-21T13:19:15Z-
dc.date.available2015-08-21T13:19:15Z-
dc.date.issued2015-
dc.identifier.citationChemical Engineering Journal, 2015, v. 280, p. 514-524-
dc.identifier.issn1385-8947-
dc.identifier.urihttp://hdl.handle.net/10722/215253-
dc.description.abstractCuCo2O4 spinel nanoparticles (NPs) synthesized using a solvothermal method were used as catalysts to activate peroxymonosulfate (PMS) with sulfamethazine (SMZ) as the target pollutant. A degradation efficiency of 87.2% was achieved in 20min with 20mgL-1 PMS and 0.01gL-1 CuCo2O4 catalyst. In contrast, only 51.1%, 11.3%, 12.5%, and 7.9% degradations of SMZ were observed with Co3O4, CuFe2O4, CuO, and Fe3O4, respectively, as the catalysts. The superior catalytic reactivity of CuCo2O4 was explained with the presence of Co2+ on the catalyst surface and the combined catalytic reactivity of copper and cobalt towards PMS. Based on the XPS results and the relative catalytic reactivity of Cu2+ and Cu+, it was proposed that the Cu2+/Cu+ circulation was least likely the key reaction steps. Instead, a complex reaction mechanism involving the generation of Cu3+ was used to explain the activation of PMS by Cu2+. The investigation on the reaction parameters showed that the SMZ degradation efficiency responded positively to increases in the PMS dose and the scavenger effect. A mild alkaline condition favored the degradation of SMZ, and an optimized operational condition was found to achieve 98% SMZ degradation with 20mgL-1 PMS, 0.04gL-1 CuCo2O4, and 5mgL-1 SMZ at pH 7.7. The activation energy of SMZ degradation was thus estimated to be 21.0kJmol-1 for the CuCo2O4/PMS system and 38.4kJmol-1 for the CuFe2O4/PMS system. Finally, a degradation mechanism on the basis of analyzing the degradation products of SMZ was proposed and the stability and reusability of the CuFe2O4 NPs were evaluated.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/cej-
dc.relation.ispartofChemical Engineering Journal-
dc.subjectCuCo2O4 catalyst-
dc.subjectPeroxymonosulfate-
dc.subjectSulfamethazine-
dc.subjectAdvanced oxidation-
dc.titleEfficient Degradation of Sulfamethazine with CuCo2O4 Spinel Nanocatalysts for Peroxymonosulfate Activation-
dc.typeArticle-
dc.identifier.emailLiu, J: liujinh@hku.hk-
dc.identifier.emailDeng, Y: dengyu@hku.hk-
dc.identifier.emailZhang, T: zhangt@hkucc.hku.hk-
dc.identifier.emailShih, K: kshih@hku.hk-
dc.identifier.authorityDeng, Y=rp02795-
dc.identifier.authorityZhang, T=rp00211-
dc.identifier.authorityShih, K=rp00167-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.cej.2015.05.121-
dc.identifier.scopuseid_2-s2.0-84934889921-
dc.identifier.hkuros250089-
dc.identifier.volume280-
dc.identifier.spage514-
dc.identifier.epage524-
dc.identifier.isiWOS:000360949900058-
dc.publisher.placeNetherlands-
dc.identifier.issnl1385-8947-

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