Application of natural citric acid sources and their role on arsenic removal from drinking water: A green chemistry approach
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- 作者：Santanu Majumder ; Bibhash Nath ; Simita Sarkar ; Sk. Mijanul Islam ; Jochen Bundschuh ; Debashis Chatterjee ; Manuela Hidalgo
- 关键词：Arsenic ; Groundwater ; Solar oxidation ; Citric acid ; Anti-oxidant activity
- 刊名：Journal of Hazardous Materials
- 出版年：15 November, 2013
- 年：2013
- 卷：262
- 期：Complete
- 页码：1167-1175
- 全文大小：1173 K
文摘
Solar Oxidation and Removal of Arsenic (SORAS) is a low-cost non-hazardous technique for the removal of arsenic (As) from groundwater. In this study, we tested the efficiency of natural citric acid sources extracted from tomato, lemon and lime to promote SORAS for As removal at the household level. The experiment was conducted in the laboratory using both synthetic solutions and natural groundwater samples collected from As-polluted areas in West Bengal. The role of As/Fe molar ratios and citrate doses on As removal efficiency were checked in synthetic samples. The results demonstrate that tomato juice (as citric acid) was more efficient to remove As from both synthetic (percentage of removal: 78-98%) and natural groundwater (90-97%) samples compared to lemon (61-83% and 79-85%, respectively) and lime (39-69% and 63-70%, respectively) juices. The As/Fe molar ratio and the citrate dose showed an 鈥榦ptimized central tendency鈥?on As removal. Anti-oxidants, e.g. 鈥榟ydroxycinnamates鈥? found in tomato, were shown to have a higher capacity to catalyze SORAS photochemical reactions compared to 鈥榝lavanones鈥?found in lemon or lime. The application of this method has several advantages, such as eco- and user- friendliness and affordability at the household level compared to other low-cost techniques.