Sunlight-driven reduction of silver ions by natural organic matter: Formation and transformation of silver nanoparticles

Wen-Che Hou, Brittany Stuart, Roberta Howes, Richard G. Zepp

研究成果: Article同行評審

142 引文 斯高帕斯(Scopus)

摘要

Photobiogeochemical reactions involving metal species can be a source of naturally occurring nanoscale materials in the aquatic environment. This study demonstrates that, under simulated sunlight exposure, ionic Ag is photoreduced in river water or synthetic natural water samples that contain natural organic matter (NOM), forming Ag nanoparticles (AgNPs) that transform in size and shape and precipitate out upon extended irradiation. We show that the dissolved oxygen concentration does not appear to affect AgNP formation rates, indicating that reactive transients such as superoxide, hydrated electron, and triplet NOM do not play a large role. By varying pH and NOM concentrations and adding competing cations on the AgNP formation, we present three lines of evidence to show that Ag ion photoreduction likely involves ionic Ag binding to NOM. Our work suggests that photochemical reactions involving ionic Ag and NOM can be a source of nanosized Ag in the environment.

原文English
頁(從 - 到)7713-7721
頁數9
期刊Environmental Science and Technology
47
發行號14
DOIs
出版狀態Published - 2013 7月 16

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 環境化學
  • 醫藥 (全部)

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