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dc.contributor.authorDong, Fengen_US
dc.contributor.authorZhou, Yanen_US
dc.identifier.citationDong, F. & Zhou, Y. (2020). Distinct mechanisms in the heteroaggregation of silver nanoparticles with mineral and microbial colloids. Water Research, 170, 115332-.
dc.description.abstractAttachment to solids is an important process for determining nanomaterial transport and their fate in environments. Here we revealed distinct behaviours in the attachment of silver nanoparticles (AgNPs) to kaolin and bacterial cells. We found preferential attachment of AgNPs to the edges of kaolin. Decreasing pH or adding metal ions promoted AgNP-kaolin attachment due to the increase of positive charge on kaolin's surfaces. Multivalent cations (Mg2+ and Ca2+) induced stronger enhancement than monovalent cations (Na+, K+ and Ag+), which demonstrated the positive role of electrostatic interaction in AgNP-kaolin attachment. However, the presence of metal ions inhibited AgNP binding to bacterial cells. The inhibitive effect was significantly correlated with solubility product of metal ions, which implied a chemical reaction mechanism in AgNP-cell attachment. In kaolin system, humic acid (HA) can considerably inhibit AgNP attachment and diminish the enhanced effects induced by metal ions. In contrast, in bacterial cell system, HA reduced the inhibitive effect of metal ions for AgNP adsorption, although HA itself had negligible effect on AgNP-cell attachment. Taken together, our results demonstrated the contribution of electrostatic attraction versus chemical interaction to the attachment of AgNPs to kaolin or bacterial cells, providing fundamental support to understand the attachment of nanomaterials to inorganic and organic solids in the environments.en_US
dc.description.sponsorshipNanyang Technological Universityen_US
dc.relation.ispartofWater Researchen_US
dc.rights© 2019 Elsevier Ltd. All rights reserved.en_US
dc.subjectEngineering::Civil engineeringen_US
dc.titleDistinct mechanisms in the heteroaggregation of silver nanoparticles with mineral and microbial colloidsen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Civil and Environmental Engineeringen_US
dc.contributor.researchNanyang Environment and Water Research Instituteen_US
dc.contributor.researchAdvanced Environmental Biotechnology Centre (AEBC)en_US
dc.description.acknowledgementThis work was supported by Nanyang Technological University Start-up Funding.en_US
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