静态法和微观光谱法研究共存无机/有机配体对Ni(II)在丝光沸石/水界面吸附行为和微观形态的影响机制

项目名称： 静态法和微观光谱法研究共存无机/有机配体对Ni(II)在丝光沸石/水界面吸附行为和微观形态的影响机制

项目编号： No.41203086

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 地球化学

项目作者： 杨世通

作者单位： 苏州大学

项目金额： 25万元

中文摘要： 污染物在矿物表面的的吸附、扩散和沉淀等物理化学反应直接决定其在环境体系中的浓度分布、迁移转化、生物可利用性和毒性。本项目拟以矿物、重金属离子和无机/有机配体 (CO32-和PO43- 等无机阴离子以及草酸、腐殖酸等有机酸) 共存的多相环境体系为研究对象，采用批实验方法研究接触时间和加入次序对Ni(II)在丝光沸石/水界面宏观吸附行为的影响，结合ATR-FTIR、XPS和XAFS等光谱技术以及FITEQL模型拟合确定Ni(II)在多相体系中的吸附形态、作用机理和微观结构。项目预期将从宏观和微观两个层面阐明共存配体与Ni(II)吸附行为之间的关联机制，揭示Ni(II)在丝光沸石表面的化学形态随接触时间和加入次序的变化规律。研究成果对于评估重金属离子的长期物理化学行为和环境生态效应具有重要的理论指导意义，同时可以为实际污染水体的修复提供准确的科学依据。

中文关键词： 重金属离子Ni(II)；粘土矿物/水界面；共存无机/有机组分；光谱分析；微观作用机制

英文摘要： The frequency and severity of heavy metal pollutants in surface and ground water are of great concern to scientists due to the potential hazardous effects on freshwater sources. Sorption, diffusion and precipitation reactions at mineral/water interfaces are closely related with the distribution, migration, transformation, accumulation, bioavailability and ecotoxicity of various pollutants in aqueous environment. To precisely predict the mobility and long-term behavior of heavy metal ions in the environment, a microscopic mechanistic understanding of metal speciation and chemical processes at mineral/water interfaces is of fundamental importance. In view of this point, a multiphase environment system containing minerals, heavy metal ions and inorganic/organic ligands (such as CO32-, PO43-, oxalic acid and humic substances etc.) is selected as the research target of this project. Batch technique will be adapted to investigate the effects of contact time and addition sequences on the macroscopic sorption behaviors of Ni(II) at mordenite/water interfaces. In addition, spectrum characterization techniques (ATR-FTIR, XPS and XAFS) and FITEQL model fitting are also combined to determine the interaction mechanisms and microstructures. The project is expected to clarify two main issues from both the macro- and micro- per

英文关键词： Heavy metal Ni(II)；Clay/water interfaces；Inorganic/organic components；Spectral analysis；Microscopic mechanisms