e-journal

New modified chitosan-based adsorbent for defluoridation of water

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Abstract.
In the present study, the metal-binding property of chitosan is used to incorporate titanium metal
and applied as an adsorbent for fluoride adsorption. Titanium macrospheres (TM) were synthesized
by a precipitation method and characterized by FTIR, SEM, and XRD. The Langmuir and Freundlich
adsorption models were applied to describe the adsorption equilibrium and the adsorption capacities
were calculated. Thermodynamic parameters of standard free energy change (AG◦), standard enthalpy
change (AH◦), and standard entropy change (AS◦) were also calculated. The effects of various physicochemical
parameters such as pH, initial concentration, adsorbent dose, and the presence of coexisting
anions were studied. The fluoride uptake was maximum at neutral pH 7 and decreased in acidic and
alkaline pH. The presence of coexisting anions has a negative effect on fluoride adsorption. TM was
found to have very fast kinetics in the first 30 min and then the rate slowed down as equilibrium was
approached. A comparison of fluoride removal in simulated and field water shows a high adsorption
capacity in simulated water.

Keywords:
Defluoridation
Chitosan
Titanium macrospheres
Fluoride adsorption
Effect of coexisting anions and pH

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Ketersediaan

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Informasi Detail

Judul Seri

Journal of Colloid and Interface Science

No. Panggil

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Penerbit

London : Elsevier Inc.., 2009

Deskripsi Fisik

Journal of Colloid and Interface Science 332 (2009) 280–290

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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