Jump to main content
Jump to site search

Issue 5, 2018
Previous Article Next Article

Impacts of titanium dioxide nanoparticles on transformation of silver nanoparticles in aquatic environments

Author affiliations

Abstract

Titanium dioxide nanoparticles (nano-TiO2) and silver nanoparticles (AgNPs) are widely used in industrial products and consumer goods due to their excellent physicochemical and antimicrobial properties. As a result of their wide applications, AgNPs and nano-TiO2 may be present in the same natural aquatic systems or wastewater treatment plants. In this study, the impacts of nano-TiO2 on the transformation of AgNPs in the dark and under simulated sunlight irradiation were investigated. Under dark conditions, heteroaggregation occurred between nano-TiO2 and AgNPs. Under sunlight irradiation, nano-TiO2 promoted the dissolution of AgNPs to release Ag+ ions and the impact became more significant as the concentration of nano-TiO2 increased. The promotion effect was attributed to the highly oxidative hydroxyl radicals generated by nano-TiO2 under sunlight irradiation. Meanwhile, some small fresh Ag0 nanoparticles formed due to the reduction of the released Ag+ ions by the photogenerated electrons on nano-TiO2. Natural organic matter, such as fulvic acid, could attenuate the promotion effect due to adsorption on the surface of nano-TiO2 and suppression of generation of hydroxyl radicals. Since Ag+ ions and small sized Ag0 nanoparticles displayed greater toxicities than large-sized AgNPs, the interaction of nano-TiO2 and AgNPs under sunlight irradiation could significantly affect the bioavailability and ecotoxicities of AgNPs.

Graphical abstract: Impacts of titanium dioxide nanoparticles on transformation of silver nanoparticles in aquatic environments

Back to tab navigation

Supplementary files

Publication details

The article was received on 10 Jan 2018, accepted on 01 Apr 2018 and first published on 05 Apr 2018


Article type: Paper
DOI: 10.1039/C8EN00044A
Citation: Environ. Sci.: Nano, 2018,5, 1191-1199
  •   Request permissions

    Impacts of titanium dioxide nanoparticles on transformation of silver nanoparticles in aquatic environments

    Y. Zhang, L. Qiang, Y. Yuan, W. Wu, B. Sun and L. Zhu, Environ. Sci.: Nano, 2018, 5, 1191
    DOI: 10.1039/C8EN00044A

Search articles by author

Spotlight

Advertisements