纳米银材料在水环境中的硫化转化行为和机制的研究

项目名称： 纳米银材料在水环境中的硫化转化行为和机制的研究

项目编号： No.41501515

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 地质学

项目作者： 张寅清

作者单位： 南开大学

项目金额： 20万元

中文摘要： 纳米银材料的大量生产和广泛应用使其通过多种途径进入水体环境，并且对水生生物产生毒性效应，最终将会对环境和人体健康带来危害。纳米银的硫化是其在水环境中的一个重要转化过程，直接决定纳米银的团聚、迁移和赋存状态，并最终影响其生物有效性和毒性。. 本项目以多种不同的纳米银材料为研究对象，拟采用批实验研究其在水环境中的硫化转化的反应动力学规律。考察纳米银材料自身理化性质（包括粒径、形貌、包覆层材料）和水环境因素（包括光照、溶解氧、离子种类、离子强度、溶解态有机质、表面活性物质等等）对其硫化转化的影响机制。揭示纳米银的硫化转化对其赋存状态的内在机制，为深入科学地评价纳米银材料对生态环境和人类健康的安全性提供理论基础。

中文关键词： 水；转化；纳米银；硫化

英文摘要： Silver nanoparticles (AgNPs) have been the most widely used nanomaterials in commercial products, and they are inevitably released into environment through different pathways. As a result, there is a growing concern about the environmental impact of released Ag nanoparticles, particularly their unintended impact on organisms and ecosystems. Sulfidation of AgNPs in aquatic environment is one of the most important environmental transformation. Studying the behaviors and mechanisms of sulfidation of AgNPs may lead us to understand more about their fate, bioavailability, and toxicity in the environment.. In this research project, sulfidation processes of AgNPs in complex aqueous environments are investigated by using a combination of spectroscopy and electron microscope measurements. We aim to disclose the impacts of physicochemical properties of AgNPs, such as particle size, morphology and coating materials, and environmentally relevant factors, such as sunlight, dissolved oxygen, ion species, ion strength, natural organic matter (NOM) and surface active agents, individually or in combination on the pathways of AgNPs chemical transformations. In aqueous solutions, we also study the mechanisms of how sulfidation processes of AgNPs affect their fate, and it also is of great significance to deeply assess the potential risk for ecological environment and human health.

英文关键词： water;transformation;silver nanoparticles;sulfidation