矿物材料在重金属污染土壤修复中的应用进展

    Application of Mineral Materials in Remediation of Heavy Metal Contaminated Soil

    • 摘要: 随着重金属污染的日益严重,固定化土壤中的重金属成为近年来学者们研究的热点,矿物材料在其中拥有不可替代的地位。本文针对目前现存的重金属土壤污染问题,概括蒙脱石、海泡石、沸石、高岭土、凹凸棒等黏土矿物及磷酸盐矿物、纳米矿物材料等几种矿物材料在重金属污染土壤稳定化修复领域的应用和反应机理。黏土矿物的稳定化能力与矿物结构有关,矿物结构决定其离子交换能力,离子交换能力强的矿物稳定化效果更为突出,同时黏土矿物亦能改变土壤的pH值等理化性质,使土壤内重金属活性降低。磷酸盐矿物的稳定化能力与其本身的溶解性呈正相关,反应机理主要为溶解-沉淀、表面吸附、离子交换、诱导吸附几种形式。纳米矿物材料在保留原材料性质的基础上,因其粒度为纳米级也展现出一些其他特性。今后可在材料回收循环利用、矿物改性方法优化、提高重金属稳定化效果和减少稳定化周期等方向进行深入研究,以期为稳定化修复土壤中重金属的研究工作提供参考意见。

       

      Abstract: With the increasingly serious pollution of heavy metals, the heavy metals in immobilized soil have become the focus of research in recent years, and mineral materials play an irreplaceable role in it. In this paper, the application and reaction mechanism of montmorillonite, sepiolite, zeolite, kaolin, attapulgite and other clay minerals as well as phosphate minerals and nano-mineral materials in the stabilization and remediation of heavy metal contaminated soil are summarized. The stabilization ability of clay minerals is related to mineral structure, which determines its ion-exchange ability. The stabilization effect of minerals with strong ion-exchange ability is more prominent. At the same time, clay minerals can also change the physical and chemical properties of soil, such as pH value, and reduce the activity of heavy metals in soil.The stabilization ability of phosphate minerals is positively correlated with its solubility, and the reaction mechanisms are mainly solution-precipitation, surface adsorption, ion exchange and induced adsorption. On the basis of retaining the properties of raw materials, nano-mineral materials also show some other characteristics due to their nano-size. In the future, further research can be conducted in the direction of material recovery and recycling, optimization of mineral modification methods, improvement of the stabilization effect of heavy metals and reduction of the stabilization period, in order to provide references for the research work of stabilization and remediation of heavy metals in soil.

       

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