巯基化氧化石墨烯/铁锰氧化物复合纳米材料原位固定土壤/地下水中汞的机理研究

项目名称： 巯基化氧化石墨烯/铁锰氧化物复合纳米材料原位固定土壤/地下水中汞的机理研究

项目编号： No.41503085

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： 宫艳艳

作者单位： 暨南大学

项目金额： 22万元

中文摘要： 土壤/地下水汞污染是工业发展与城市化进程中的突出问题，危害人类健康和生态安全。目前可同时固定低浓度（ppb）无机汞和有机汞的方法报道很少。近年来低成本、无毒无害、周期短、固定化效果强的纳米材料的原位修复技术得到了广泛关注。本项目拟制备一种新型的巯基化氧化石墨烯/铁锰氧化物复合纳米材料（SGO/Fe-Mn），研究其对污染场地无机汞和甲基汞的迁移和宿命的影响。探讨我国代表性土壤和地下水条件下，SGO/Fe-Mn对土壤和地下水中无机汞和有机汞的固定速率、固定效果和固定机制；考察SGO/Fe-Mn的物理化学演变，与土壤的相互作用，对土壤理化性质等的影响；研究SGO/Fe-Mn在土壤中的迁移过程及运移诱发的污染物的迁移及固定。通过控制SGO/Fe-Mn的颗粒粒径和浓度加强汞的原位固定，降低其物理化学和生物可用性，为我国重金属污染的原位固定提供重要的理论支持和实践经验。

中文关键词： 重金属；汞；修复机理；原位修复

英文摘要： Mercury is one of the most pervasive, persistent, and extremely toxic metals in the environment, posing direct harm to human health and ecological safety. Hg(II) is the most predominant inorganic form of mercury, whereas methylmercury (MeHg) is the primary mercury species that accumulates in the food chain. However, only a few researchers reported thorough removal of inorganic and organic mercury from groundwater/soil. In situ remediation technology using nanoparticles have been consistently sought due to its unique advantages, such as low cost, reduced remediation time, less environmental disruption, and enhanced particle reactivity with contaminants. This research aims to develop a new class of thoil-functionalized graphene oxide/Fe-Mn oxide nanocomposites (SGO/Fe-Mn) and investigate effects of SGO/Fe-Mn on mobility, fate, and transport of inorganic and organic mercury (Hg(II) and MeHg) in soil and groundawter. The specific objectives are as follows: 1) prepare and characterize SGO/Fe-Mn; 2) investigate the effectiveness of SGO/Fe-Mn for in situ immobilization of Hg(II) and MeHg in soil and groundwater under typical subsurface hydrodynamic and environmental conditions; 3) examine the evolution of SGO/Fe-Mn, the interaction with soil, and the effects on soil physical and chemical properties; and 4) determine the transport behavior of SGO/Fe-Mn in the soil and the resulting effects on the physical, chemical, and biological availabilities of mercury in soil and groundwater. The outcome of the proposed research will establish the mechanism on the effects of SGO/Fe-Mn on the mobility of mercury, and provide important theoretical foundation and practical experience for in situ remediation of highly toxic heavy metals in soil and groundwater of China.

英文关键词： Heavy metals;Mercury;Remediation mechanisms;In situ remediation