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Adsorption of Fluoride from Aqueous Solution Using Low-Cost Bentonite/Chitosan Beads

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DOI: 10.4236/ajac.2013.47A007    4,673 Downloads   6,958 Views   Citations

ABSTRACT

A new adsorbent namely bentonite/chitosan beads has been synthesized and studied for its defluoridation efficiency. Bentonite was activated and the beads were prepared using the inverse suspension polymerization method. The bentonite/chitosan beads (bentonite dosage of 3.0 g) showed an adsorption capacity of 0.895 mg/g whereas chitosan beads had only 0.359 mg/g. The optimal pH value was observed at pH 5 where the adsorbent reached the maximum defluoridation capacity of 1.164 mg/g. The effect of temperature, contact time and initial fluoride concentration on the adsorption capacity of the adsorbent has also been investigated. Scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX) and Fourier-transform infrared spectrometry (FTIR) were used to characterize the adsorbent. The adsorption of fluoride onto the adsorbent followed Freundlich isotherm model and pseudo-second order kinetic model. The fluoride loaded adsorbent could be regenerated using sodium hydroxide.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Y. Zhang, D. Wang, B. Liu, X. Gao, W. Xu, P. Liang and Y. Xu, "Adsorption of Fluoride from Aqueous Solution Using Low-Cost Bentonite/Chitosan Beads," American Journal of Analytical Chemistry, Vol. 4 No. 7A, 2013, pp. 48-53. doi: 10.4236/ajac.2013.47A007.

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