Adsorption of arsenate on lanthanum-impregnated activated alumina: In situ ATR-FTIR and two-dimensional correlation analysis study
Adsorption of arsenate on lanthanum-impregnated activated alumina: In situ ATR-FTIR and two-dimensional correlation analysis study
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DOI：
10.1016/j.cclet.2014.12.009
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发表时间：
2015-02
影响因子：
9.1
通讯作者：
Qiantao Shi;Wei Yan
中科院分区：
文献类型：
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作者：
Qiantao Shi;Wei Yan
镧改性材料已广泛应用于有害阴离子的去除。采用原位ATR-FTIR和二维相关分析研究了镧浸渍活性氧化铝（LAA）对砷酸根（As（V））的吸附机理。结果表明，As（V）离子通过静电相互作用吸附到LAA表面，在pH 5-9的条件下，As（V）离子可在LAA表面形成单齿构型. 2D-COS结果表明，在不同pH条件下，H2 AsO 4-和HAsO 42-两种共存的As（V）吸附物种在LAA表面上的吸附顺序不一致，表明As（V）的质子掺入对LAA表面吸附亲和力的影响可以忽略不计。本研究的结果揭示了LAA表面络合物在分子尺度上的见解，并提供了理论支持，新的金属氧化物的设计，以有效地去除砷。
Lanthanum modified materials have been widely used for the removal of hazardous anions. In this study,in situATR-FTIR and two-dimensional correlation analysis were employed to investigate the adsorption mechanism of arsenate (As(V)) on lanthanum-impregnated activated alumina (LAA). Our results showed that electrostatic interaction attracted As(V) anions to the LAA surface, and then As(V) could form monodentate configuration on the LAA surface at pH 5–9. The result of 2D-COS showed that two coexistent adsorbed As(V) species, H2AsO4−and HAsO42−, were adsorbed on the LAA surface without specific sequence at different pH conditions, indicating a negligible role of the incorporated protons of As(V) on the adsorption affinity to LAA surface. The results of this study reveal insights into LAA surface complexes on the molecular scale and provide theoretical support to new metal oxides design for efficient arsenic removal.