Complexation mechanism of Pb2+ at the ferrihydrite-water interface: The role of Al-substitution

文献类型: 外文期刊

第一作者: Liang, Yu

作者: Liang, Yu;Wei, Zhiyuan;Liang, Yu;Jin, Jiezi;Wang, Mingxia;Xiong, Juan;Hou, Jingtao;Tan, Wenfeng

作者机构: Chinese Acad Trop Agr Sci, Trop Crops Genet Resources Inst, Haikou 571101, Hainan, Peoples R China;Huazhong Agr Univ, Coll Resources & Environm, State Environm Protect Key Lab Soil Hlth & Green, Wuhan 430070, Peoples R China

关键词: Iron (hydr)oxides; Al-substitution; Surface charge; Heavy metal adsorption; CD-MUSIC model

期刊名称:CHEMOSPHERE ( 2022影响因子:8.8; 五年影响因子:8.3 )

ISSN: 0045-6535

年卷期: 2022 年 307 卷

页码:

收录情况: SCI

摘要: Ferrihydrite is a poorly crystalline iron (hydr)oxide and highly efficient adsorbent for heavy metals. Al-substitution in ferrihydrite is ubiquitous in nature. However, the effect of Al-substitution on the surface reactivity of ferrihydrite remains unclear due to its low crystallinity. The present study aims to clarify the microstructure and interfacial reaction of Al-substituted ferrihydrite. Al-substitution had little effect on the morphology and surface site density of ferrihydrite, while the presence of =AlOH-0.5 sites resulted in higher proton affinity and surface positive charge of ferrihydrite. Besides, the affinity constant of Pb2+ adsorption on the surface of ferrihydrite decreased at higher Al content, which further decreased the adsorption performance of ferrihydrite for Pb2+. The modeling results revealed that bidentate complex was the dominant Pb complexation species on the surface of ferrihydrite, which was less affected by Al-substitution. The present study provides important insights into the effect of Al-substitution on the interfacial reaction at the ferrihydrite-water interface. The obtained parameters may facilitate the future advance of surface complexation model.

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