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Article: Factors and Mechanisms that Influence the Reactivity of Trivalent Copper: A Novel Oxidant for Selective Degradation of Antibiotics

TitleFactors and Mechanisms that Influence the Reactivity of Trivalent Copper: A Novel Oxidant for Selective Degradation of Antibiotics
Authors
KeywordsAntibiotics
Copper(III) periodate
Cu3+
Cupryl species
Selective oxidation
Issue Date2019
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watres
Citation
Water Research, 2019, v. 149, p. 1-8 How to Cite?
AbstractTrivalent copper complexes are active intermediates in aquatic redox reactions that involve copper ions or structural copper, but their reactivity and selectivity toward pollutants remain unknown. We characterized copper(III) periodate, a representative trivalent copper compound, with phenol and several antibiotics as model contaminants. The results show that Cu(III) is highly reactive to phenol degradation; near-complete degradation was achieved after 10 min at a molar ratio of 3:1 (Cu[III]: phenol). Common alcohols, including methanol and 2-propanol, showed pH-dependent reactivity for Cu(III). In contrast to aquo trivalent copper ions that react rapidly with tert-butanol, Cu(III) showed limited reactivity toward tert-butanol. A mechanistic investigation showed that the degradation was caused by direct oxidation by Cu(III) and that no hydroxyl radicals were involved. Common water components such as chloride ions did not influence the reaction, which suggests that the use of Cu(III) may help mitigate the generation of chlorinated products. As a one-electron oxidant, Cu(III) showed high reactivity to degrade electron-rich compounds; the concentrations of sulfamethazine, sulfamethoxazole, and sulfadiazine (100 μg/L) were reduced to 1.8, 7.5, and 42.5 ng/L, respectively, after 2 min of reaction with 10 μM Cu(III). These results demonstrate a novel and highly efficient oxidant for selective removal of ubiquitous micropollutants from water bodies. © 2018 Elsevier Ltd
Persistent Identifierhttp://hdl.handle.net/10722/275705
ISSN
2019 Impact Factor: 9.13
2015 SCImago Journal Rankings: 2.772
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorFeng, Y-
dc.contributor.authorQing, W-
dc.contributor.authorKong, L-
dc.contributor.authorLi, H-
dc.contributor.authorWu, D-
dc.contributor.authorFan, Y-
dc.contributor.authorLee, PH-
dc.contributor.authorShih, K-
dc.date.accessioned2019-09-10T02:47:59Z-
dc.date.available2019-09-10T02:47:59Z-
dc.date.issued2019-
dc.identifier.citationWater Research, 2019, v. 149, p. 1-8-
dc.identifier.issn0043-1354-
dc.identifier.urihttp://hdl.handle.net/10722/275705-
dc.description.abstractTrivalent copper complexes are active intermediates in aquatic redox reactions that involve copper ions or structural copper, but their reactivity and selectivity toward pollutants remain unknown. We characterized copper(III) periodate, a representative trivalent copper compound, with phenol and several antibiotics as model contaminants. The results show that Cu(III) is highly reactive to phenol degradation; near-complete degradation was achieved after 10 min at a molar ratio of 3:1 (Cu[III]: phenol). Common alcohols, including methanol and 2-propanol, showed pH-dependent reactivity for Cu(III). In contrast to aquo trivalent copper ions that react rapidly with tert-butanol, Cu(III) showed limited reactivity toward tert-butanol. A mechanistic investigation showed that the degradation was caused by direct oxidation by Cu(III) and that no hydroxyl radicals were involved. Common water components such as chloride ions did not influence the reaction, which suggests that the use of Cu(III) may help mitigate the generation of chlorinated products. As a one-electron oxidant, Cu(III) showed high reactivity to degrade electron-rich compounds; the concentrations of sulfamethazine, sulfamethoxazole, and sulfadiazine (100 μg/L) were reduced to 1.8, 7.5, and 42.5 ng/L, respectively, after 2 min of reaction with 10 μM Cu(III). These results demonstrate a novel and highly efficient oxidant for selective removal of ubiquitous micropollutants from water bodies. © 2018 Elsevier Ltd-
dc.languageeng-
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watres-
dc.relation.ispartofWater Research-
dc.subjectAntibiotics-
dc.subjectCopper(III) periodate-
dc.subjectCu3+-
dc.subjectCupryl species-
dc.subjectSelective oxidation-
dc.titleFactors and Mechanisms that Influence the Reactivity of Trivalent Copper: A Novel Oxidant for Selective Degradation of Antibiotics-
dc.typeArticle-
dc.identifier.emailFeng, Y: jerryf@HKUCC-COM.hku.hk-
dc.identifier.emailKong, L: kongljun@hku.hk-
dc.identifier.emailShih, K: kshih@hku.hk-
dc.identifier.authorityShih, K=rp00167-
dc.description.naturelink_to_OA_fulltext-
dc.identifier.doi10.1016/j.watres.2018.10.090-
dc.identifier.pmid30408631-
dc.identifier.scopuseid_2-s2.0-85056170863-
dc.identifier.hkuros303603-
dc.identifier.volume149-
dc.identifier.spage1-
dc.identifier.epage8-
dc.identifier.isiWOS:000458221200001-
dc.publisher.placeUnited Kingdom-
dc.identifier.issnl0043-1354-

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