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纳米零价铁/活性炭复合材料对河流沉积物中重金属(铜、铅、镉和铬)的稳定化研究

Investigation of heavy metal (Cu, Pb, Cd, and Cr) stabilization in river sediment by nano-zero-valent iron/activated carbon composite.

作者信息

Chen Wei-fang, Zhang Jinghui, Zhang Xiaomao, Wang Weiya, Li Yuxiang

机构信息

School of Environment and Architecture, University of Shanghai for Science and Technology, 516 Jungong Rd., Shanghai, 200093, China.

出版信息

Environ Sci Pollut Res Int. 2016 Jan;23(2):1460-70. doi: 10.1007/s11356-015-5387-5. Epub 2015 Sep 15.

Abstract

Nano-zero-valent iron/activated carbon (nZVI/AC) composite was evaluated for its effectiveness in the stabilization of Cu, Pb, Cd, and Cr in dredged river sediment. Synthetic precipitation leaching procedure (SPLP) and toxicity characteristic leaching procedure (TCLP) were adopted to compare the effects of nZVI/AC dosage, particle size, time duration, and temperature on heavy metal leachability. The results show that leachability dropped considerably with the addition of nZVI/AC and powdered particles in the size of 0.075-0.18 mm was more effective in stabilization than granular ones. Stabilization effect was stable in long-term and robust against changes in temperature. Tessier sequential extraction revealed that heavy metals were associated with solid particle, inorganic or organic matters in sediment. The addition of nZVI/AC was able to convert relatively weakly bound heavy metals into more strongly bound species and thus reduce the bioavailability and toxicity. Also, the standard potential of heavy metals may decide the mechanism of stabilization process.

摘要

评估了纳米零价铁/活性炭(nZVI/AC)复合材料对疏浚河道沉积物中铜、铅、镉和铬的稳定化效果。采用合成沉淀浸出程序(SPLP)和毒性特性浸出程序(TCLP),比较了nZVI/AC用量、粒径、时间和温度对重金属浸出性的影响。结果表明,添加nZVI/AC后浸出性显著降低,粒径为0.075-0.18毫米的粉末颗粒在稳定化方面比颗粒状颗粒更有效。长期来看,稳定化效果稳定,且对温度变化具有抗性。Tessier连续提取表明,重金属与沉积物中的固体颗粒、无机或有机物质有关。添加nZVI/AC能够将结合相对较弱的重金属转化为结合更强的形态,从而降低生物有效性和毒性。此外,重金属的标准电位可能决定稳定化过程的机制。

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