稳定化的零价Fe,FeS,Fe3O4纳米颗粒在土壤中的固砷作用机理

被引：20

作者：

张美一

潘纲

机构：

[1] 中国科学院生态环境研究中心,环境水质学国家重点实验室

来源：

科学通报 | 2009年 / 54卷 / 23期

关键词：

砷; 固定; 铁; 纳米颗粒; 土壤污染; 土壤修复;

D O I：

暂无

中图分类号：

S153 [土壤化学、土壤物理化学];

学科分类号：

摘要：

砷是一种广泛存在于土壤和地下水中的污染物.虽然多种铁基材料已被用于受污染土壤中砷的固定,但是关于稳定化的铁系纳米颗粒在该方面的研究鲜见报道.本文研究了3种经淀粉固定的铁系纳米颗粒(零价Fe,FeS,Fe3O4)对两种典型砷污染土壤(果园土壤、靶场土壤)的固砷作用.为了检测纳米颗粒对砷的去除效果,实验中采取了不同的Fe/As摩尔比(5:1～100:1)和接触时间(3或7d).土壤中砷的生物活性和浸出率分别用生理原理提取法(physiologically based extraction test,PBET)和毒性浸出程序(toxicity characteristic leaching procedure,TCLP)方法表征.在实验时间为3d、Fe/As摩尔比为100:1的实验中,果园砂质土壤中砷的生物活性从最初的71.3%±3.1%分别降至30.9%±3.2%(零价Fe)、37.6%±1.2%(FeS)和29.8%±3.1%(Fe3O4);靶场土壤中砷的浸出率从初始0.51%±0.11%分别降至0.24%±0.03%(零价Fe)、0.27%±0.04%(FeS)和0.17%±0.04%(Fe3O4).3种纳米颗粒中Fe3O4的固砷效率最高.比较两种土壤,可以看出该处理方法更适用于铁含量较低、砷初始浸出率较高的果园土壤.结果表明,对于砷污染的贫铁土壤、沉积物和固废等,环境友好的铁系纳米颗粒是十分有效的固砷材料.

引用

页码：3637 / 3644

页数：8

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