The immobilisation and retention of soluble arsenic, cadmium and zinc by biochar
The immobilisation and retention of soluble arsenic, cadmium and zinc by biochar
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DOI：
10.1016/j.envpol.2010.10.016
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发表时间：
2011-02-02
影响因子：
8.9
通讯作者：
Marmiroli, Marta
中科院分区：
文献类型：
--
作者：
Beesley, Luke;Marmiroli, Marta
如果不阻止水溶性无机污染物在土壤中的移动和可能转移到植物或地下水中，它们可能构成环境毒性问题。采用柱淋溶试验和扫描电镜/能谱分析（SEM/EDX）研究了生物炭对沉积物源土壤中砷（As）、镉（Cd）和锌（Zn）的固定和截留能力。吸附镉和锌的生物炭的表面协助减少300和45倍，分别在其渗滤液浓度。保留这两种金属是不受影响的相当大的水溶性碳从生物炭浸出，并不能逆转随后浸出的吸附剂生物炭与水在pH 5.5。弱水溶性砷也保留在生物炭的表面，但渗滤液浓度没有适当下降。它的结论是，生物炭可以迅速降低选定的污染物在这个污染的土壤系统中的流动性，特别是令人鼓舞的结果镉。(C)2010爱思唯尔有限公司版权所有。
Water-soluble inorganic pollutants may constitute an environmental toxicity problem if their movement through soils and potential transfer to plants or groundwater is not arrested. The capability of biochar to immobilise and retain arsenic (As), cadmium (Cd) and zinc (Zn) from a multi-element contaminated sediment-derived soil was explored by a column leaching experiment and scanning electron microanalysis (SEM/EDX). Sorption of Cd and Zn to biochar's surfaces assisted a 300 and 45-fold reduction in their leachate concentrations, respectively. Retention of both metals was not affected by considerable leaching of water-soluble carbon from biochar, and could not be reversed following subsequent leaching of the sorbant biochar with water at pH 5.5. Weakly water-soluble As was also retained on biochar's surface but leachate concentrations did not duly decline. It is concluded that biochar can rapidly reduce the mobility of selected contaminants in this polluted soil system, with especially encouraging results for Cd. (C) 2010 Elsevier Ltd. All rights reserved.