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Enhanced arsenite immobilization via ternary layered double hydroxides and application to paddy soil remediation

机译：通过三元双层氢氧化物增强砷固定化作用及其在水稻土修复中的应用

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A ternary CaMgFe-LDH was developed for the immobilization of aqueous arsenic from capillary water in paddy soils, with an outstanding removal performance for aqueous arsenite (As(III)). In an As(III) solution, the ternary LDH achieved a removal capacity for arsenite of approximately 16 mg g?1 after 5 h, with a low equilibrium concentration of As(III) (0.048 mg L?1). The As(III) removal capacity of LDH was studied with the different Ca/Mg molar ratios in LDH, which demonstrated that ternary LDHs with a higher Ca content can remove As(III) more effectively and rapidly. Accordingly, the ternary LDH material was used in the immobilization of total arsenic from a paddy soil system, achieving a removal efficiency for As(III) of 47% and a total As concentration of 346 μg L?1 in capillary water after 40 days. Compared to that of the binary Mg–Fe LDH, the As removal performance of the ternary LDH was higher, which was attributed to the As precipitation with Ca in the first 20 days during the experiment. This, along with the efficient adsorption of As on the residual Mg–Fe-LDH framework, was responsible for the low concentration of As. Therefore, our study proposes a promising approach to the remediation of arsenic-contaminated paddy soils.
机译：开发了一种三元CaMgFe-LDH，用于固定稻田土壤中毛细水中的砷水溶液，对砷水溶液（As（ III ）具有出色的去除性能。在As（ III ）溶液中，三元LDH在5 h后对砷的去除能力约为16 mg g ？1 。低平衡浓度的As（ III ）（0.048 mg L ？1 ）。以不同的Ca / Mg摩尔比对LDH中的As（ III ）去除能力进行了研究，结果表明，Ca含量较高的三元LDHs可以去除As（ III >）更有效，更快速。因此，将三元LDH材料用于固定水稻土系统中的总砷，去除As（ III ）的效率为47％，总As浓度为346μgL ？1 。与二元Mg-Fe LDH相比，三元LDH的As去除性能更高，这归因于实验过程中前20天用Ca沉淀了As。这与砷在残留的Mg-Fe-LDH骨架上的有效吸附一起导致了砷的低浓度。因此，我们的研究提出了一种有前途的修复受砷污染的水稻土的方法。

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