Adsorption of Arsenate on Iron Oxides as Influenced by Humic Acids

文献类型： 外文期刊

第一作者： Luo, Chang

作者： Luo, Chang;Xie, Yawei;Li, Fang;Jiang, Tao;Wang, Qiang;Jiang, Zhenmao;Wei, Shiqiang

作者机构：

期刊名称：JOURNAL OF ENVIRONMENTAL QUALITY （ 影响因子：2.2； 五年影响因子：2.7 ）

ISSN： 0047-2425

年卷期： 2015 年 44 卷 6 期

页码：

收录情况： SCI

摘要： Humic acid (HA) and iron oxides (FeOs) commonly coexist, and their interactions alter their ability to adsorb pollutants in the environment. The influences of HA on arsenate [As(V)] adsorption on FeOs were investigated on the preformation of complexes and their coexistence with As(V) in solution. The results indicated that HA could be strongly adsorbed on FeOs, and the adsorption capacity (Q(max), mg g(-1) HA-C) followed the sequence goethite (7.73) > ferrihydrite (3.14) > hematite (2.25) with a desorption rate < 1%. The HA adsorbed existed uniformly on the FeOs surfaces in spot form and did not change the x-ray diffraction (XRD) patterns of FeOs. The formation of FeOs-HA complexes altered As(V) adsorption with a reduced adsorption capacity, prolonged reaction kinetics, and enhanced adsorption strength. The As(V) adsorption on both FeOs and FeOs-HA complexes decreased with increasing pH (2.5-9) or decreasing ionic strength (0.2-0 M). The coexistence of HA in solution linearly decreased the As(V) adsorption on FeOs. Thus, our results demonstrated two impact pathways of HA on As(V) adsorption on FeOs: (i) blockage or occupation in the surface sites of FeOs if HA preformed complexes with FeOs and (ii) a competition to the surface sites of FeOs when HA coexisted with As(V) in the solution.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序