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Journal of Applied Sciences
Year: 2004  |  Volume: 4  |  Issue: 3  |  Page No.: 467 - 471

Efficient Removal of Arsenic from Polluted Ground Water

A. Bhaumik, S. Samanta and N.K. Mal    

Abstract: Arsenic concentration in the polluted ground water has been sufficiently reduced from its alarming limit to a permissible one (~0.02 mg L-1) employing the intercalation behaviour of Layered Double Hydroxide (LDH) Mg-Al hydrotalcite. The exchange reaction was very simple and the efficiency of the process remained almost same after many cycles. This efficiency of arsenic removal from contaminated ground water has been drastically improved using pre-treatment with a small amount of dilute aqueous H2O2 to oxidize As3+ to As5+ under mild acid pH condition and followed by its exchange with hydrotalcite. After few exchange cycles the solid exchanger could be easily exchanged with a saturated NaCl solution to regenerate the LDH for further use.

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