Characteristics and Influencing Factors of Monothioarsenate Adsorption on Goethite

被引：0
作者：
Liao D.-X. [1 ,2 ]
Shan H.-M. [1 ,2 ]
Zhang J.-X. [1 ,2 ]
Peng S.-X. [3 ]
Huang J. [1 ,2 ]
Chen H. [1 ,2 ]
Zhao C.-R. [1 ,2 ]
Zeng C.-Y. [1 ,2 ]
机构：
[1] Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin
[2] Collaborative Innovation Center for Water Pollution Control and Water Security in Karst Areas, Guilin University of Technology, Guilin
[3] College of Earth Sciences, Guilin University of Technology, Guilin
来源：
Shan, Hui-Mei (shanhuimei@glut.edu.cn) | 1600年 / Science Press卷 / 41期
关键词：
Adsorption; Goethite; Humic acid(HA); Influencing factors; Monothioarsenate (MTA);
D O I：
10.13227/j.hjkx.202001132
中图分类号：
学科分类号：
摘要：
The adsorption kinetic of monothioarsenate (MTA) on goethite was characterized in this study, and batch experiments were then designed to further explore the effects of arsenate, arsenite, humic acid (HA), nitrate, and phosphate on the adsorption of MTA on goethite, and to identify the adsorption mechanism. The results showed that: ① When a single arsenic species was present in a solution, the adsorption equilibrium times of MTA, arsenate, and arsenite on goethite were 8, 2, and 4 h, respectively. The adsorption experimental data of these three arsenic species were well fitted to a pseudo-second-order kinetic model. The equilibrium adsorption capacities (qe) of MTA, arsenate, and arsenite on goethite were 2 129.851, 3 291.838, and 1 788.767 mg•kg-1, respectively. When MTA coexisted with arsenate or arsenite in a solution, MTA adsorption on goethite continued to be well fitted to a pseudo-second-order kinetic model. The value of qe for MTA was significantly reduced to 1 236.941 mg•kg-1 when MTA coexisted with arsenate, and to 1 532.287 mg•kg-1 when MTA coexisted with arsenite, due to the fact that arsenate and arsenite competed for adsorption sites with MTA. ② With an increase in HA concentration (10-50 mg•L-1), the qe of MTA decreased gradually, due to the fact that a large number of functional groups in HA preempted the surface adsorption sites of goethite with MTA. ③ When phosphate was added into the MTA solution, the qe values of MTA, arsenate, and arsenite on goethite were reduced greatly, to 492.802, 815.782, and 303.714 mg•kg-1, respectively, which was caused by the competitive adsorption of P and As. When nitrate was added into the MTA solution, the number of electron receptors and Eh of the solution increased, leading to the qe values of MTA, arsenate, and arsenite on goethite increasing to 2 211.030, 3 444.023, and 1 835.537 mg•kg-1, respectively. © 2020, Science Press. All right reserved.
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页码：3337 / 3344
页数：7
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