Removing Heavy Metals in Water: The Interaction of Cactus Mucilage and Arsenate (As (V))
Removing Heavy Metals in Water: The Interaction of Cactus Mucilage and Arsenate (As (V))
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DOI：
10.1021/es2021999
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发表时间：
2012-04-17
影响因子：
11.4
通讯作者：
Alcantar, Norma A.
中科院分区：
文献类型：
--
作者：
Fox, Dawn I.;Pichler, Thomas;Alcantar, Norma A.
地下水中高浓度的砷继续威胁着全世界数百万消费者的健康。特别是，发展中国家受影响的社区需要可获得的技术来去除饮用水中的砷。探索仙人掌胶乳、仙人掌果胶多糖提取物在除砷中的应用。用胶凝提取物(GE)和非凝胶提取物(NE)对合成砷(As(V))溶液进行了批量试验。平衡后测量气水界面上的砷浓度。Ge和NE处理的溶液在气水界面上的砷浓度分别平均增加了14%和9%，说明胶体结合并将砷输送到气水界面。FTIR研究表明，胶体中的-CO基团(羧基和羰基)和-OH(羟基)官能团参与了与砷酸盐的相互作用。在弱碱性(pH=9)和弱酸性(pH=5.5)条件下，胶凝活性较强。这种相互作用可以被优化和利用，以去除饮用水中的砷。这项工作为应用天然果胶材料去除水中的阴离子金属物种开辟了新的道路。
High concentrations of arsenic in groundwater continue to present health threats to millions of consumers worldwide. Particularly, affected communities in the developing world need accessible technologies for arsenic removal from drinking water. We explore the application of cactus mucilage, pectic polysaccharide extracts from Opuntia ficus-indica for arsenic removal. Synthetic arsenate (As (v)) solutions were treated with two extracts, a gelling extract (GE) and a nongelling extract (NE) in batch trials. The arsenic concentration at the air water interface was measured after equilibration. The GE and NE treated solutions showed on average 14% and 9% increases in arsenic concentration at the air water interface respectively indicating that the mucilage bonded and transported the arsenic to the air water interface. FTIR studies showed that the -CO groups (carboxyl and carbonyl groups) and -OH (hydroxyl) functional groups of the mucilage were involved in the interaction with the arsenate. Mucilage activity was greater in weakly basic (pH 9) and weakly acidic (pH 5.5) pH. This interaction can be optimized and harnessed for the removal of arsenic from drinking water. This work breaks the ground for the application of natural pectic materials to the removal of anionic metallic species from water.