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dc.contributor.authorLiu, Siqian
dc.contributor.authorLiu, Yang
dc.contributor.authorPan, Bo
dc.contributor.authorHe, Ying
dc.contributor.authorLi, Bowen
dc.contributor.authorZhou, Dandan
dc.contributor.authorXiao, Yinlong
dc.contributor.authorQiu, Hao
dc.contributor.authorVijver, Martina G
dc.contributor.authorPeijnenburg, Willie J G M
dc.date.accessioned2020-04-05T14:46:45Z
dc.date.available2020-04-05T14:46:45Z
dc.date.issued2020-04-01
dc.identifier.issn1879-1298
dc.identifier.pmid31864948
dc.identifier.doi10.1016/j.chemosphere.2019.125612
dc.identifier.urihttp://hdl.handle.net/10029/623701
dc.description.abstractHumic substances are the dominant dissolved organic matter fraction in the aqueous phase of environmental media. They would inevitably react with chemicals released into the environment. The influence of dissolved humic acid (DHA) on the dissolution and dispersion of copper oxide nanoparticles (CuO NPs, 50 nm, 49.57 mg L-1) was therefore investigated in the present study. In addition to dispersing CuO NPs and reducing the size of the aggregates, the amount of released Cu from CuO NPs was found to increase over time with increasing concentrations of DHA, 96% of which was present as organic complexes after 72 h. At DHA concentrations exceeding 16.09 mg C L-1, the complexation coefficients of DHA with Cu and the adsorptivity of CuO NPs to DHA were both reduced due to increased homo-conjugation of DHA as promoted by negative charge-assisted H-bond. Although the adsorption capacity of DHA kept increasing up to 57.07 mg C L-1, the hydrodynamic diameter and ζ-potential were similar and the percentages of total released Cu continued to increase linearly to 4.92% at higher levels of DHA (30.13-57.07 mg C L-1). Thereupon, DHA promoted the dissolution of CuO NPs in a concentration-dependent fashion. The driving force was complexation of Cu by DHA, rather than the balancing between the exposed and the covered surface area of the CuO NPs due to DHA adsorption. Our findings facilitate understanding the underlying mechanisms on how DHA impacts the CuO NPs environmental behavior (or fate) as well as on their kinetics.en_US
dc.language.isoenen_US
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectCopper oxide nanoparticlesen_US
dc.subjectCu complexationen_US
dc.subjectDissolutionen_US
dc.subjectDissolved humic aciden_US
dc.subjectNegative charge-assisted H-Bonden_US
dc.subjectParticle dispersionen_US
dc.titleThe promoted dissolution of copper oxide nanoparticles by dissolved humic acid: Copper complexation over particle dispersion.en_US
dc.typeArticleen_US
dc.identifier.journalChemosphere 2020; 245:125612en_US
dc.source.journaltitleChemosphere


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