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首页> 外文会议>International Conference on the Biogeochemistry of Trace Elements >Selenium and molybdenum adsorption on kaolinite clay mineral coated with hydrous oxides of iron and aluminum
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Selenium and molybdenum adsorption on kaolinite clay mineral coated with hydrous oxides of iron and aluminum

机译：硒和钼和钼粘土矿物质涂有铁和铝含水氧化物的吸附

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Reclamation of abandoned acid mine soils is often limited by lack of suitable soil materials for establishing self-sustaining vegetation. Fly ash has been used to create technogenic soils for reclamation of abandoned mine lands. Fly ash contains toxic trace elements such as selenium and molybdenum that can leach into the groundwater from ash treated soils. In abandoned acid mine lands, oxidation of pyrite generates acidity and dissolved Fe and Al. Neutralization of pyrite oxidation generated acidity with alkalinity from fly ash produces coatings of iron and aluminum hydrous-oxides on the surface of soil clay minerals. Kaolinite is the dominant clay mineral in these soils and Fe and A1 coated kaolinite can retain Se and Mo. Laboratory investigations were conducted to determine the effect of three levels of oxide coatings on kaolinite, on Se and Mo retention capacity of coated kaolinite. Adsorption of selenite and molybdate occurred on hydrous oxide coated kaolinite above pH.. Significant adsorption of selenate only occurred at pH values lower than pH_o of the concerned solid phase. Coating of kaolinite with Fe as well as Al hydrous oxide increased the anion retention capacity of the mineral. The effect was, however, more for Fe than A1 hydrous oxide. Surface sites for the adsorption of anions were limited. Results of this investigation show that adsorption will play a very important role in controlling the mobility of oxyanions in fly ash treated mine soils containing relatively high amounts of Fe and A1 hydrous oxide coatings.
机译：废弃酸性矿井土壤的回收通常受到用于建立自我维持植被的合适土壤材料的限制。粉煤灰已被用来为遗弃矿山垦区创造培养土壤。粉煤灰含有毒性微量元素，如硒和钼，可以从灰烬处理的土壤中浸入地下水中。在废弃的酸性矿井中，黄铁矿氧化产生酸度并溶解Fe和Al。粉丝氧化的酸度从粉煤灰产生酸度，在土壤粘土矿物表面上产生铁和铝含水氧化物的涂层。高岭土是这些土壤中的主要粘土矿物质，Fe和A1涂层高岭石可以保留SE和MO.进行实验室调查，以确定涂层高岭石对高岭石氧化物涂层的氧化涂层对涂层高岭石的影响。硒酸盐和钼酸盐的吸附发生在含水氧化物涂层高于pH的pH中。硒酸盐的显着吸附仅在pH值低于相关固相的pH_o时发生。具有Fe的高岭石涂层以及Al含水氧化物增加了矿物的阴离子保持能力。然而，Fe比A1含水氧化物更多的效果更多。用于吸附阴离子的表面位点受到限制。该研究的结果表明，吸附将在含有相对大量的Fe和A1含氢氧化物涂料中控制粉煤灰处理矿井土壤中氧气的迁移率来发挥非常重要的作用。

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