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Sci. Lett. J. 2012, 1: 20
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Research Article
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Full Text
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Effect of phosphate and silicate on the removal of As(III) using HFO supported polymeric materials
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Medhat Mohamed El-Moselhy
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Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt
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Abstract |
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Exposure to arsenic through drinking water poses a threat to human health. Batch and column run experiments were carried out to study the kinetics and efficiency of inorganic arsenic removal by using Hydrated Iron Oxide (HFO) modified A500p anion exchange polymeric material (HAIX) as inexpensive and potentially efficient resin, and as well as the effects of phosphate (0-10 mg/L) and silicate (30 mg/L) on the removal process at pH ~7.2. Batch experiments showed that both arsenate and arsenite compounds could be removed efficiently from simulated groundwater in the absence of both phosphate and silicate oxyanions. Whereas, upon the addition of different doses of phosphate (0.4 -0 mg/L); not only the removal of As diminishes but also the adsorbed As is replaced by the competing phosphate. On the other hand, column run data indicate that the addition of silicate (30 mg/L) side by side with phosphate causes the earlier breakthrough for arsenic. In all cases, As(III) was oxidized to As(V) in solution by dissolved oxygen and the reaction rate was probably promoted by intermediates formed during the adsorption process.
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Keywords
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Oxyanions; Competition; Phosphate; Silicate; HFO
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