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Article: Efficient Degradation of Sulfamethazine with CuCo2O4 Spinel Nanocatalysts for Peroxymonosulfate Activation
Title | Efficient Degradation of Sulfamethazine with CuCo2O4 Spinel Nanocatalysts for Peroxymonosulfate Activation |
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Authors | |
Keywords | CuCo2O4 catalyst Peroxymonosulfate Sulfamethazine Advanced oxidation |
Issue Date | 2015 |
Publisher | Elsevier 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? |
Abstract | CuCo2O4 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 Identifier | http://hdl.handle.net/10722/215253 |
ISSN | 2023 Impact Factor: 13.3 2023 SCImago Journal Rankings: 2.852 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Feng, Y | - |
dc.contributor.author | Liu, J | - |
dc.contributor.author | Wu, D | - |
dc.contributor.author | Zhou, Z | - |
dc.contributor.author | Deng, Y | - |
dc.contributor.author | Zhang, T | - |
dc.contributor.author | Shih, K | - |
dc.date.accessioned | 2015-08-21T13:19:15Z | - |
dc.date.available | 2015-08-21T13:19:15Z | - |
dc.date.issued | 2015 | - |
dc.identifier.citation | Chemical Engineering Journal, 2015, v. 280, p. 514-524 | - |
dc.identifier.issn | 1385-8947 | - |
dc.identifier.uri | http://hdl.handle.net/10722/215253 | - |
dc.description.abstract | CuCo2O4 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.language | eng | - |
dc.publisher | Elsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/cej | - |
dc.relation.ispartof | Chemical Engineering Journal | - |
dc.subject | CuCo2O4 catalyst | - |
dc.subject | Peroxymonosulfate | - |
dc.subject | Sulfamethazine | - |
dc.subject | Advanced oxidation | - |
dc.title | Efficient Degradation of Sulfamethazine with CuCo2O4 Spinel Nanocatalysts for Peroxymonosulfate Activation | - |
dc.type | Article | - |
dc.identifier.email | Liu, J: liujinh@hku.hk | - |
dc.identifier.email | Deng, Y: dengyu@hku.hk | - |
dc.identifier.email | Zhang, T: zhangt@hkucc.hku.hk | - |
dc.identifier.email | Shih, K: kshih@hku.hk | - |
dc.identifier.authority | Deng, Y=rp02795 | - |
dc.identifier.authority | Zhang, T=rp00211 | - |
dc.identifier.authority | Shih, K=rp00167 | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.cej.2015.05.121 | - |
dc.identifier.scopus | eid_2-s2.0-84934889921 | - |
dc.identifier.hkuros | 250089 | - |
dc.identifier.volume | 280 | - |
dc.identifier.spage | 514 | - |
dc.identifier.epage | 524 | - |
dc.identifier.isi | WOS:000360949900058 | - |
dc.publisher.place | Netherlands | - |
dc.identifier.issnl | 1385-8947 | - |