Thakare, Dilip and Rayalu, Sadhana and Kawade, Raju and Meshram, Siddharth and Subrt, J and Labhsetwar, Nitin (2010) Magnesium incorporated bentonite clay for defluoridation of drinking water. Journal of Hazardous Materials, 180. pp. 122-130. ISSN 0304-3894

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Abstract

Low cost bentonite clay was chemically modified using magnesium chloride in order to enhance its fluoride removal capacity. The magnesium incorporated bentonite (MB) was characterized by using XRD and SEM techniques. Batch adsorption experiments were conducted to study and optimize various operational parameters such as adsorbent dose, contact time, pH, effect of co-ions and initial fluoride concentration. It was observed that the MB works effectively over wide range of pH and showed a maximum fluoride removal capacity of 2.26mgg−1 at an initial fluoride concentration of 5mg L−1, which is much better than the unmodified bentonite. The experimental data fitted well into Langmuir adsorption isotherm and follows pseudo-first-order kinetics. Thermodynamic study suggests that fluoride adsorption onMBis reasonably spontaneous and an endothermic process.MBshowed significantly high fluoride removal in synthetic water as compared to field water. Desorption study of MB suggest that almost all the loaded fluoride was desorbed (∼97%) using 1M NaOH solution however maximum fluoride removal decreases from 95.47 to 73 (%) after regeneration. From the experimental results, it may be inferred that chemical modification enhances the fluoride removal efficiency of bentonite and it works as an effective adsorbent for defluoridation of water.

Item Type:	Article
Uncontrolled Keywords:	Adsorption; Bentonite; Fluoride Removal; Adsorption Isotherm; Drinking Water
Subjects:	Materials Science
Divisions:	UNSPECIFIED
Depositing User:	Dr. Nitin Labhasetwar
Date Deposited:	09 Jan 2018 11:02
Last Modified:	09 Jan 2018 11:02
URI:	http://neeri.csircentral.net/id/eprint/1021

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