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：

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

期刊名称：CHEMOSPHERE （ 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.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序