纳米零价铁@氢氧化镁的合成、活化机制及其在印染废水深度处理中的应用研究

项目名称： 纳米零价铁@氢氧化镁的合成、活化机制及其在印染废水深度处理中的应用研究

项目编号： No.21477128

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 环境科学、安全科学

项目作者： 王永好

作者单位： 福州大学

项目金额： 50万元

中文摘要： 纳米零价铁(nZVI)在环境修复和污染治理方面有广阔应用前景。然而，其易团聚及活性随使用时间而迅速降低的缺点成为其应用的瓶颈问题。已有研究通过负载或核壳结构成功解决材料的团聚问题，但nZVI因易氧化而引起的氧化层包覆导致的材料活性降低，依然是研究的难点和热点。本研究拟借鉴矿物表面的离子交换原理，以自支撑氢氧化镁负载适量nZVI作为研究对象，通过分析nZVI与氢氧化镁的结合方式，及微溶于溶液中mM量级的Mg2+破坏nZVI的表面氧化层的途径，阐明氢氧化镁既降低nZVI的团聚又提高活性的机理；同时基于氢氧化镁对水中低浓度的有机物和重金属有较强的吸附能力，及nZVI高效的还原和降解能力，拓展nZVI@Mg(OH)2在印染废水的生化出水(含低浓度有机物和重金属)处理中的应用，并阐明相关科学问题。此研究不仅对于理解nZVI的活性和使用周期具有重要意义，同时对印染废水的深度处理提出新的潜在解决方案。

中文关键词： 纳米零价铁(nZVI)；花状氢氧化镁；染料废水；铅离子；

英文摘要： Nanoscale zero-valent iron（nZVI） have been successfully used for the remediation of contaminated groundwater. However, the limitations include the aggregation of nZVI and decreasement of activity. Hence, nZVI has been not widely used in environmental remediation. Currently, the aggregation of nZVI has been solved by formation of the supported-nZVI or of the core-shell structure, but the the activity reduction resulting from the susceptibility of oxidation is still a problem. Therefore, in this proposal, we intend to synthesize the flower-like Mg(OH)2 used as the support materials to reduce both the aggregation and the oxidation, where will based on the aspect: similar to the surface of the mineral, ion exchange reaction occur between Mg2 + and the oxidized surface of nZVI since Mg(OH)2 have a appropriate solubility in aqeous solution (Ksp=10-11). The genernated H+ by ion excxhange damage the oxidized layer of nZVI. Conseqently, the regerenation of reactivity and stablity of nZVI is possible. We will understand the interaction beween nZVI and Mg(OH)2 , the way of damaging oxidized layer , the stablity of nZVI@ Mg(OH)2, and their application in treatment of printing and dyeing waste water. The outcomes from this proposal is not only a sigficantly improving the nZVI application on contaminated site remedation,

英文关键词： nanoscale zero-valent iron；flower-like Mg(OH)2；dye wastwater；Pb2+；