Reduction of Ionic Silver by Sulfur Dioxide as a Source of Silver Nanoparticles in the Environment

银纳米粒子 化学 溶解 水溶液 环境化学 离子键合 成核 生物地球化学循环 金属 硫黄 无机化学 纳米颗粒 离子 纳米技术 材料科学 有机化学
作者
Zhineng Hao,Fasong Li,Rui Liu,Xiaoxia Zhou,Yujing Mu,Virender K. Sharma,Jingfu Liu,Guibin Jiang
出处
期刊:Environmental Science & Technology [American Chemical Society]
卷期号:55 (8): 5569-5578 被引量:19
标识
DOI:10.1021/acs.est.0c08790
摘要

The natural formation of silver nanoparticles (AgNPs) via biotic and abiotic pathways in water and soil media contributes to the biogeochemical cycle of silver metal in the environment. However, the formation of AgNPs in the atmosphere has not been reported. Here, we describe a previously unreported source of AgNPs via the reduction of Ag(I) by SO2 in the atmosphere, especially in moist environments, using multipronged advanced analytical and surface techniques. The rapid reduction of Ag(I) in the atmospheric aqueous phase was mainly caused by the sulfite ions formed from the dissolution of SO2 in water, which contributed to the formation of AgNPs and was consistent with the Finke-Watzky model with a major contribution of the reduction-nucleation process. Sunlight irradiation excited SO2 to form triplet SO2, which reacted with water to form H2SO3 and greatly enhanced Ag(I) reduction and AgNP formation. Different pH values affected the speciation of Ag(I) and S(IV), which were jointly involved in the reduction of Ag(I). The formation of AgNPs was also observed in the atmospheric gas phase via direct reduction of Ag(I) by SO2(gas), which occurred even in 50 ppbv SO2(gas). The natural occurrence of AgNPs in the atmosphere may also be involved in silver corrosion, AgNP transformation and regeneration, detoxification of gaseous pollutants, and the sulfur cycle in the environment.
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