Removal of arsenic from water through adsorption onto metal oxide-coated material
Sharf Ilahi Siddiqui, Saif Ali Chaudhry
Arsenic, a metalloid having a terrible impact on human health, is threatening the world continuously. It has become a curse for more than 20 countries and can be gauged from the fact that over 100 million peoples of Bangladesh and Bengal province of India are consuming arsenic contaminated ground water having concentration more than the WHO permissible limit. Traditional techniques used for removal of both forms of arsenic were not suitable for the As(III) form. Adsorption is a preferable method and different types of solid materials particles being used are fine powders that are difficult to separate from water. Moreover, fine powders cannot be used in column applications because of their low hydraulic conductivity. That is why; researchers have proposed metal oxide-coated media for use in adsorption technique. Recently, researchers have developed metal oxide coated adsorbents including, sand, natural rock, ceramic materials, activated carbon, perlite, zeolite, and some organic polymers being used as surface materials. In this review, most of the valuable literature available on arsenic remediation by adsorption using coated adsorbents and existing purification methods for drinking water; wastewater; industrial effluents, and technological solutions for arsenic have been listed. Herein, arsenic sorption by different coated materials surveyed and their sorption efficiencies have been compared. Arsenic adsorption behaviour in presence of other impurities and their separation/regeneration techniques has also been discussed.
Heavy Metal, Arsenic, Arsenic Effect, Arsenic Remediation, Adsorption, Iron Oxide
Published online 4/25/2017, 51 pages
Copyright © 2016 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: Sharf Ilahi Siddiqui, Saif Ali Chaudhry, ‘Removal of arsenic from water through adsorption onto metal oxide-coated material’, Materials Research Foundations, Vol. 15, pp 227-276, 2017
The article was published as article 9 of the book Applications of Adsorption and Ion Exchange Chromatography in Waste Water Treatment
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