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Removal of Fluoride from Water by Adsorption onto Lanthanum Oxide

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Abstract

Rare earth mineral based adsorbent viz. lanthanum oxide was investigated for potential application in defluoridation of drinking water for isolated and rural communities. Results of batch experiments indicated about 90% removal in 30 min from a 4 mg L−1 synthetic fluoride solution. The effects of various parameters like contact time, pH, initial concentration, and sorbent dose on sorption efficiency were investigated. Adsorption efficiency was dependent on initial fluoride concentration and the sorption process followed BET model. Variation of pH up to 9.5 has insignificant effect on sorption and beyond a pH of 9.5, the effect was drastic. Among anions investigated, carbonates exhibited high detrimental effect on fluoride adsorption while anions like bicarbonates, chlorides, and sulfates did not seriously affect the process. Adsorbent showed negligible desorption of fluoride in distilled water. Alum was more effective regenerant than HCl and NaOH. Results of cyclic regeneration with alum indicated that the sorbent could be regenerated for ten cycles without significant loss of sorption capacity. Studies with upflow fixed-bed continuous flow columns indicated the usefulness of sorbent for fluoride removal in continuous flow process.

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Correspondence to Janakiraman Karthikeyan.

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Rao, C.R.N., Karthikeyan, J. Removal of Fluoride from Water by Adsorption onto Lanthanum Oxide. Water Air Soil Pollut 223, 1101–1114 (2012). https://doi.org/10.1007/s11270-011-0928-0

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  • DOI: https://doi.org/10.1007/s11270-011-0928-0

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