Department of Mechanical Engineering, University of Alberta, Edmonton, AB T6G 2G8, Canada.
J Hazard Mater. 2013 Nov 15;262:1176-86. doi: 10.1016/j.jhazmat.2012.06.036. Epub 2012 Jun 23.
Arsenic pollution in groundwater is a worldwide concern due to its chronic effects on human health. Numerous studies have been carried out to obtain cost-effective arsenic removal method. Adsorption using natural materials or its treated forms is found to be cost-effective technology. Raw laterite (RL) or its treated form (TL) is studied recently as arsenic adsorbent for aqueous system. Laterite composition varies with geographical location and extent of lateritization. The study on effects of arsenic adsorption with varying composition of laterite is not explored yet. Four laterite samples with different compositions are examined to remove arsenic from water. These laterite samples are activated using an optimized acid followed by base treatment method in order to determine the effects of RL composition on arsenic adsorption behavior of TL. Higher iron and aluminum containing RL samples show higher arsenic adsorption behavior. Similarly, TL obtained from higher iron and aluminum containing RL sample shows the higher specific surface area (130-180 m(2) g(-1)) and pore volume (0.28-0.35 mL g(-1)). Two household filters using TL are deployed in arsenic affected area of Barasat, 24 Parganas (N), West Bengal, India and their performance is monitored for about a year.
地下水砷污染是一个全球性的问题，因为它对人类健康有慢性影响。已经进行了许多研究以获得具有成本效益的除砷方法。使用天然材料或其处理形式的吸附被发现是具有成本效益的技术。原红土（RL）或其处理形式（TL）最近被研究为水系统中的砷吸附剂。红土的组成因地理位置和红土化程度而异。关于不同组成的红土对砷吸附影响的研究尚未开展。本研究采用四种不同组成的红土样品来去除水中的砷。这些红土样品先用优化的酸进行活化，然后用碱处理，以确定 RL 组成对 TL 砷吸附行为的影响。含铁量和含铝量较高的 RL 样品表现出较高的砷吸附行为。同样，来自含铁量和含铝量较高的 RL 样品的 TL 表现出较高的比表面积（130-180 m(2) g(-1))和孔体积（0.28-0.35 mL g(-1))。在印度西孟加拉邦 24 号县巴拉沙特受砷影响的地区部署了两个使用 TL 的家用过滤器，并对其性能进行了大约一年的监测。
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