Please use this identifier to cite or link to this item:
Title: Distinct mechanisms in the heteroaggregation of silver nanoparticles with mineral and microbial colloids
Authors: Dong, Feng
Zhou, Yan
Keywords: Engineering::Civil engineering
Issue Date: 2020
Source: Dong, F. & Zhou, Y. (2020). Distinct mechanisms in the heteroaggregation of silver nanoparticles with mineral and microbial colloids. Water Research, 170, 115332-.
Journal: Water Research 
Abstract: Attachment 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.
ISSN: 0043-1354
DOI: 10.1016/j.watres.2019.115332
Schools: School of Civil and Environmental Engineering 
Research Centres: Nanyang Environment and Water Research Institute 
Advanced Environmental Biotechnology Centre (AEBC) 
Rights: © 2019 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:CEE Journal Articles
NEWRI Journal Articles

Citations 20

Updated on Dec 8, 2023

Web of ScienceTM
Citations 20

Updated on Oct 27, 2023

Page view(s)

Updated on Dec 7, 2023

Google ScholarTM




Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.