Morphological evolution and reconstruction of silver nanoparticles in aquatic environments: the roles of natural organic matter and light irradiation

Journal of Hazardous Materials
Xiaoyan ZouHongwu Zhang

Abstract

With the proliferation of silver nanoparticles (AgNPs), their potential entry into the environment has attracted increasing concern. Although photochemical transformation is an important fate of AgNPs in aquatic environments due to their strong light absorption, little is known about the evolution and transformation mechanisms of AgNPs. This study investigated the morphological evolution and reconstruction of AgNPs during photoconversion in the presence of natural organic matter (NOM). In the dark, the AgNPs formed chain-like structures through bridging effects with NOM at concentrations of 0.1 and 1 mg/L, and the proportion of Ag(+) in solution in the presence of 10 mg/L NOM was reduced by roughly half compared with that in the absence of NOM. Under irradiation, NOM participated in the photoreaction of AgNPs and can decelerate the photoreaction of AgNPs via several mechanisms, including light attenuation, the formation of a NOM coating, and competing with Ag for photons. Additionally, NOM can substitute for citrate as a stabilizing agent to compensate for the loss of AgNP stability due to citrate mineralization under extended irradiation, producing stable triangular nanosilver in aquatic environments. This study sheds light on...Continue Reading

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Citations

Jan 23, 2016·Environmental Science & Technology·Isabella RomerJamie R Lead
Oct 16, 2016·Environmental Science & Technology·Wei ZhouJohn J Lenhart
Jan 24, 2019·Environmental Science and Pollution Research International·Weicheng ZhangLunguang Yao
Jun 5, 2020·Small·Magdiel Inggrid SetyawatiKee Woei Ng
Sep 9, 2018·The Science of the Total Environment·Belén Herce-SesaCarlos Moreno
Sep 6, 2018·The Science of the Total Environment·Yaning YangLijun Wu
Jan 6, 2021·Environmental Science and Pollution Research International·Lilian R R SouzaMárcia A M S da Veiga

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