期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 25, 期 15, 页码 14585-14594出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-018-1488-2
关键词
Simultaneous adsorption; Ferrihydrite; Arsenic; Antimony; Synergistic effect
资金
- Natural Science Foundation of China [21506135]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
- Soochow University
Competitive adsorption of As(V) and Sb(V) at environmentally relevant concentrations onto ferrihydrite was investigated. Batch experiments and XPS analyses confirmed that in a binary system, the presence of Sb(V) exhibited a slight synergistic effect on As(V) adsorption. XPS analyses showed that As(V) and Sb(V) adsorption led to obvious diminishment of Fe-O-Fe and Fe-O-H bonds respectively. At pH of 9, a more significant decrease of Fe-O-Fe was observed in the binary system than that in a single system, indicating that As(V) displayed an even stronger interaction with lattice oxygen atoms under competitive conditions. Basically, ionic strength demonstrated a negligible or positive influence on As(V) and Sb(V) adsorption in binary system. Study of adsorption sequence also indicated that the presence of Sb(V) showed a promotion effect on As(V) adsorption at neutral pHs. Considering that co-contamination of As and Sb in waters has been of great concern throughout the world, our findings contributed to a better understanding of their distribution, mobility, and fate in environment.
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