Detoxification of heavy metals
Detoxification of heavy metals
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DOI：
10.1007/978-3-642-21408-0
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
I. Sherameti;A. Varma
中科院分区：
文献类型：
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作者：
I. Sherameti;A. Varma
沸石通过利用其众所周知的高阳离子交换能力而大量用于土壤修复技术。除此之外，沸石还具有大的孔隙和内部空腔。这种孔隙可以用来捕获几乎不可溶的HM沉淀物，从而在化学上降低它们的溶解度，并在微观水平上物理隔离污染物。沸石合成可以很容易地在土壤中在低温下通过在碱性条件下添加含Si和Al的材料来促进。作为该过程的结果，HM被稳定为捕获在结晶沸石结构内的氧化物和氢氧化物的微米或纳米簇，或者被无定形“地质聚合物”物理和化学固定。在该方法中，可以有利地使用废料如粉煤灰、高炉矿渣、建筑废料、玻璃和铝废料，以及廉价的碱性试剂（例如，促进土壤中的沸石合成可以是有效地稳定污染场所中的HM的有前景的方法，特别是与其他物理化学或生物修复方法组合。
Zeolites are largely used in soil remediation technologies by exploiting their well-known high cation-exchange capacity. Besides this property, zeolites possess large pores and internal cavities. Such pores can be used to trap scarcely soluble HM precipitates, thus chemically reducing their solubility and physically isolating the contaminant at the microscopic level.Zeolite synthesis can be easily promoted in soil at low temperatures by adding Si- and Al-containing materials in alkaline conditions. As a consequence of this process, HM are stabilized as micro- or nanoclusters of oxides and hydroxides trapped inside the structure of crystalline zeolites or physically and chemically immobilized by amorphous “geopolymers.”In this process, waste materials such as coal fly ash, blast furnace slag, building wastes, glass, and aluminum refuses can be profitably employed, together with cheap alkali reagents (e.g., NaOH, KOH, and lime).Promoting zeolite synthesis in soil can be a promising methodology to effectively stabilize HM in polluted sites, especially in combination with other physicochemical or biological remediation processes.