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首页> 外文期刊>Applied Geochemistry: Journal of the International Association of Geochemistry and Cosmochemistry >Characteristics of arsenic adsorption from aqueous solution: Effect of arsenic species and natural adsorbents
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Characteristics of arsenic adsorption from aqueous solution: Effect of arsenic species and natural adsorbents

机译：水溶液中砷的吸附特性：砷种类和天然吸附剂的影响

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摘要

Batch and column experiments were conducted on As adsorption from aqueous solution by natural solids to test the feasibility of these materials to act as adsorbents for As removal from groundwater and drinking water. The solids considered are natural hematite and natural siderite. The As species studied are As(V), As(III) and dimethylarsinic acid (DMA). Arsenic(III), As(V) and DMA were removed to different extents by the solids studied from water solutions containing these three As species, with the highest efficiency for As(V). In aqueous solutions with a mixture of As species, adsorption kinetics depend on the species. On both materials, As(V) was preferentially adsorbed in the batches and first reached equilibrium, followed by DMA and As(M). The As adsorption took place more slowly on natural hematite and natural siderite compared with ferrihydrite. The results demonstrate that the amount of As removed from As(III) batches was greater than that from As(V) batches due to a surface alteration of the solids caused by As(III) oxidation. Although the highest efficiency for As retention was observed on hematite HIO1 in the batch experiments, siderite used as column filling was more efficient in removing As from water containing the As species studied in comparison with hematite. The coating of fresh Fe(III)-oxides was much more intensive in the siderite-packed column than in the hematite-packed column. The combination of siderite and hematite would promote the column filling performance in removing As from aqueous solution.
机译：对天然固体从水溶液中吸附As进行了分批和柱实验，以测试这些材料作为从地下水和饮用水中去除As的吸附剂的可行性。所考虑的固体是天然赤铁矿和天然菱铁矿。所研究的As物种为As（V），As（III）和二甲基砷酸（DMA）。从含有这三种砷物质的水溶液中研究的固体中，砷（III），砷（V）和DMA的去除程度不同，砷（V）的效率最高。在具有As物种混合物的水溶液中，吸附动力学取决于物种。在这两种材料上，As（V）均优先吸附在批次中，并首先达到平衡，然后是DMA和As（M）。与三水铁矿相比，As在天然赤铁矿和天然菱铁矿上的吸附更为缓慢。结果表明，由于As（III）氧化引起的固体表面变化，从As（III）批次中除去的As量大于从As（V）批次中除去的As。尽管在批处理实验中在赤铁矿HIO1上观察到了最高的As保留效率，但与赤铁矿相比，用作柱填充的菱铁矿更有效地从含As物种的水中去除As。在菱铁矿填充塔中比在赤铁矿填充塔中新鲜的Fe（III）氧化物涂层的致密性要强得多。菱铁矿和赤铁矿的结合将提高从水溶液中去除砷的色谱柱填充性能。

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