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Synthesis Optimization and Fluoride Uptake Properties of High Capacity Composite Adsorbent for Defluoridation of Drinking Water

IR@CSIR-NEERI

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Title Synthesis Optimization and Fluoride Uptake
Properties of High Capacity Composite Adsorbent
for Defluoridation of Drinking Water
 
Creator Thakare, Dilip
Dixit, Priyadarshini
Waghmare, Sanghratna
Manwar, Nilesh
Labhsetwar, Nitin
Rayalu, Sadhana
 
Subject Materials Science
 
Description A novel low cost composite adsorbent has been successfully
synthesized from waste eggshell (ES), alum, and chitin
for removal of excess fluoride from drinking water. Synthesis
of chitin based adsorbent (CBA) was optimized by varying
different synthesis parameters such as alumina loading,
ES:chitin ratio, calcination temperature, calcination time,
shaking time, drying temperature, and washing time. CBA is
a composite type material having heterogeneous phases of
Ca(OH)2, Al(OH)3, Al2O3 encapsulated with carbon,
Al(OH)3 and Al2O3 deposited on carbon and Al2O3. Presence
of multiple phases with prominent presence of crystalline as
well as amorphous phases of alumina has been substantiated
by using XRD and SEM analysis. The elemental composition
of material and EDX also suggests composite nature of material
with different phases. The SEM image of CBA reveals the
presence of both coarse and fine particles with irregularly
shaped particles of alumina agglomerates adhering to calcite
particles of ES. Defluoridation performance was systematically
studied for CBA, which has outperformed several
reported adsorbents with its higher adsorption capacity of
30.3 mg g21. No significant influence on the percent fluoride
removal was observed in presence of Cl2, SO24
and NO23
ions, whereas the fluoride removal decreases significantly by
36, 24.84 and 24% in presence of HCO3
2, CO23
and PO24
ions, respectively. CBA follows pseudo second order kinetic
and fluoride adsorption mechanism was rather complex one,
wherein both intraparticle diffusion and surface diffusion
are involved in the rate-limiting step. Negligible leaching of
Al13 ions was observed.
 
Publisher Wiley
 
Date 2015-11
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://neeri.csircentral.net/1090/1/10.1002%40ep.12152.pdf
Thakare, Dilip and Dixit, Priyadarshini and Waghmare, Sanghratna and Manwar, Nilesh and Labhsetwar, Nitin and Rayalu, Sadhana (2015) Synthesis Optimization and Fluoride Uptake Properties of High Capacity Composite Adsorbent for Defluoridation of Drinking Water. Environmental Progress & Sustainable Energy, 34 (6). pp. 1576-1585. ISSN 1944-7450
 
Relation http://onlinelibrary.wiley.com/doi/10.1002/ep.v34.6/issuetoc
http://neeri.csircentral.net/1090/