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Efficient Removal of Arsenic (V) from Water Using Steel Making Slag

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The study describes potential use of steel making slag as a potential arsenic removal media. The study shows systematic analysis of slag material mostly having oxides of calcium, iron, silicon and phosphorous. The equilibrium time is shown to be 2 hr and the removal capacity is 99% with adsorbent loading of 1.25g/l under the experimental conditions. The adsorption kinetics is shown to follow a pseudo second order rate equation and the adsorption isotherm to follow both Langmuir and Freundlich isotherms well. Variations in solution pH explain that with decrease in initial solution pH adsorption capacity decreases. This is attributed to leaching of silica and phosphate from slag to solution and imparting a competing effect for adsorption sites. Moreover for alkaline pH such leaching is reduced and due to formation of calcium carbonate from leached calcium of slag material, the arsenic removal efficiency increases as it is co-precipitated with calcium carbonate. Key words: steel making slag, arsenic removal, adsorption, leaching, low-cost adsorbent

DOI: http://dx.doi.org/10.2175/106143013X13736496909662

Appeared or available online: September 7, 2013

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