纳米零价铁组装的超微球修复地下水中氯代物的研究

项目名称： 纳米零价铁组装的超微球修复地下水中氯代物的研究

项目编号： No.51308312

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 建筑科学

项目作者： 何锋

作者单位： 浙江工业大学

项目金额： 24万元

中文摘要： 纳米零价铁是一种很有前途的地下水原位修复材料，但是纳米零价铁技术在现阶段还存在较多的问题，比如其制备成本高、活性高却寿命低以及地下流动性差等。针对上述缺陷，本申请提出用水热方法合成Fe3O4超微球然后用氢气还原获得一种新的纳米零价铁结构，由多个小的纳米零价铁子颗粒组装而成的、单分散的零价铁超微球。我们预想这一结构将提高纳米铁子颗粒污染物降解活性和寿命的平衡以及超微球在多孔介质中的流动性。本研究拟通过系统的污染物降解、颗粒老化、和柱实验来验证这些预想，进而通过对零价铁超微球及其老化产物的形态，结构等的系统表征来重点研究超微球物理特性对活性和寿命平衡提高的机理，以及通过胶体、过滤理论来解释超微球结构对地下传递性的促进机制。单分散零价铁超微球用于地下水原位修复，目前国内外尚无相关报道，具有创新性。

中文关键词： 纳米零价铁；脱氯；球磨；电子效率；

英文摘要： Nanoscale zerovalent iron (ZVI) is a promising material for remediation of thousands of sites that are contaminated by chlorinated solvents. However, current nanoscale ZVI technology suffers from high material cost, short subsurface lifetime and low mobility in groundwater. To address these problems, we propose to produce a novel and inexpensive ZVI supraparticles that are assembled by nanoscale ZVI. Monodisperse magnetite supraparticles (~220 nm) is firstly synthesized using microwave-assisted hydrothermal process and then reduced by H2 at > 500 oC to obtain ZVI supraparticles. The magnetite and ZVI supaparticles are subjected to extensive physical characterization using various techniques. The reactivity of ZVI supraparticle is evaluated through the degradation of trichloroethene (TCE) and its longevity in groundwater is evaluated through its Fe0 content and TCE degradation rate change during its aging in simulated groundwater. The combined information is used to understand the structure advantage of ZVI supraparticles for enhancing the particle reactivity and longevity balance, compared to nanoscale ZVI synthesized under similar conditions and the other two traditional nanoscale ZVI. The transport of ZVI supraparticles in porous media is evaluated in a sand column and modelled by modified classical filtrati

英文关键词： zero-valent iron；dechlorination；ball mill；electron efficiency；