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Magnesium incorporated bentonite clay for defluoridation of drinking water

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Title Magnesium incorporated bentonite clay for defluoridation of drinking water
 
Creator Thakare, Dilip
Rayalu, Sadhana
Kawade, Raju
Meshram, Siddharth
Subrt, J
Labhsetwar, Nitin
 
Subject Materials Science
 
Description 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.
 
Publisher Elsevier
 
Date 2010-04-09
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://neeri.csircentral.net/1021/1/thakre2010.pdf
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
 
Relation https://www.journals.elsevier.com/journal-of-hazardous-materials/
http://neeri.csircentral.net/1021/