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Preparation and Characterization of Polyalthia longifolia Based Alumina as a Novel Adsorbent for Removing Fluoride from Drinking Water

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Title Preparation and Characterization of Polyalthia longifolia Based Alumina
as a Novel Adsorbent for Removing Fluoride from Drinking Water
 
Creator Waghmare, Sanghratna S
Arfin , Tanvir
Manwar, Nilesh
Lataye, Dilip H
Labhsetwar, Nitin
Rayalu, Sadhana
 
Subject Materials Science
 
Description This research addresses i) synthesis of an alumina composite based on high capacity adsorbent using
a leaf as a template and ii) the issue of handling spent regenerant resulting from regeneration of such high capacity
adsorbents. A low-cost composite type adsorbent has been synthesized for removal of excess fluoride from drinking
water, using Polyalthia longifolia (false Ashoka tree) leaf as a template and alum as a source of alumina. The
composite adsorbent having heterogeneous phases of Al(OH)3 and Al2O3 is associated with carbon and free Al(OH)3
and alumina has been identified using XRD, SEM, FTIR and BET surface area analysis. Batch adsorption experiments
were carried out including the effect of various physico-chemical parameters, such as adsorbent dose, pH,
contact time, initial fluoride ion concentration and temperature to ascertain optimal performance conditions. The
elemental composition of material and SEM analysis suggests a composite material with different phases. Polyalthia
longifolia based adsorbent (PBA) effectively removes fluoride with substantially high adsorption capacity of 17.57
mg g-1 at initial fluoride concentration of 5 mg l-1 using very low dose of 0.4 g l-1 as compared to 1.82 mg g-1 for
activated alumina. PBA has been regenerated to the tune of about 80% using alum solution. The spent regenerant
has been subjected to two new options i) recovery of alum and formation of chitosan/CaF composite by treating with
slaked lime and ii) immobilization of AlF in chitosan to form chitosan/AlF composite. These composites may prove to
be useful optic materials for UV absorption.
 
Publisher Asian Journal of Advances Basic Sciences
 
Date 2015-08-20
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://neeri.csircentral.net/1085/1/03%20SW%204_1_.pdf
Waghmare, Sanghratna S and Arfin , Tanvir and Manwar, Nilesh and Lataye, Dilip H and Labhsetwar, Nitin and Rayalu, Sadhana (2015) Preparation and Characterization of Polyalthia longifolia Based Alumina as a Novel Adsorbent for Removing Fluoride from Drinking Water. Asian Journal of Advances Basic Sciences, 4 (1). pp. 12-24. ISSN 2454-7492
 
Relation http://ajabs.org/
http://neeri.csircentral.net/1085/