Competitive and cooperative adsorption of arsenate and citrate on goethite
Competitive and cooperative adsorption of arsenate and citrate on goethite
复制标题
针铁矿对砷酸盐和柠檬酸盐的竞争和协同吸附
DOI：
10.1016/s1001-0742(09)60019-x
复制
发表时间：
2009-01-01
影响因子：
6.9
通讯作者：
Wang Chengzhi
中科院分区：
文献类型：
--
作者：
Shi Rong;Jia Yongfeng;Wang Chengzhi
The fate of arsenic in natural environments is influenced by adsorption onto metal (hydr)oxides. The extent of arsenic adsorption is strongly affected by coexisting dissolved natural organic acids. Recently, some studies reported that there existed competitive adsorption between arsenate and citrate on goethite. Humic acid is known to interact strongly with arsenate by forming complexes in aqueous solution, hence it is necessary to undertake a comprehensive study of the adsorption of arsenate/citrate onto goethite in the presence of one another. The results showed that at the arsenate concentrations used in this study (0.006-0.27 mmol/L), citrate decreased arsenate adsorption at acidic pH but no effect was observed at alkaline pH. In comparison, citrate adsorption was inhibited at acidic pH, but enhanced at alkaline pH by arsenate. This was probably due to the formation of complex between arsenate and citrate like the case of arsenate with humic acid. These results implied that the mechanism of the adsorption of arsenate and citrate onto goethite in the presence of one another involved not only competition for binding sites, but the cooperation between the two species at the water-goethite interface as well.
