Adsorption of AsIII, AsV and dimethylarsinic acid onto synthesized lepidocrocite
Adsorption of AsIII, AsV and dimethylarsinic acid onto synthesized lepidocrocite
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DOI：
10.1080/10934529.2013.776916
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发表时间：
2013-05
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影响因子：
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通讯作者：
Junfeng Wan;S. Simon;V. Deluchat;M. Dictor;C. Dagot
中科院分区：
文献类型：
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作者：
Junfeng Wan;S. Simon;V. Deluchat;M. Dictor;C. Dagot
零价铁对砷的捕集强烈依赖于铁副产物。其中，纤蛇纹石的研究较少。在这项工作中，我们研究了两个无机（砷III，砷V）和一个有机（二甲基胂酸，DMA）砷物种到纤铁矿的吸附。pH的影响被认为是在5至9的范围内，这对应于天然水的pH值。Langmuir模型被用来模拟As吸附等温线。结果表明，纤铁矿对AsV、DMA和AsIII的吸附容量分别为0、25、0、41和1 mol/kg零价铁。pH值的影响不同，从一个砷物种到另一个：增加pH值提高AsIII和DMA的吸附，而它有一个非常低的影响AsV吸附。
The trapping of arsenic by zero valent iron is strongly dependant on iron by-products. Among these, lepidocrite has been scarcely studied. In this work, we studied the adsorption of two inorganic (AsIII, AsV) and one organic (dimethylarsinic acid, DMA) arsenic species onto lepidocrocite. pH influence was considered in the range 5 to 9, which corresponds to natural water pH. Langmuir model was used to simulate As adsorption isotherms. Our results showed that lepidocrocite offers high adsorption capacities: up to 0,25, 0,41 and 1 mol for AsV, DMA and AsIII could be respectively trapped per kilogram of zero-valent iron. pH influence varied from one arsenic species to another: increasing pH improve AsIII and DMA sorption whereas it has a very low effect on AsV sorption.