Sorption behaviour of fluoride on carboxylated cross-linked chitosan beads

被引：100

作者：

Viswanathan, Natrayasamy ^{[1
]}

Sundaram, C. Sairam ^{[2
]}

Meenakshi, S. ^{[1
]}

机构：

[1] Gandhigram Rural Univ, Dept Chem, Gandhigram 624302, Tamil Nadu, India

[2] Karaikal Polytech Coll, Dept Sci & Humanities, Karaikal 609609, Puducherry, India

来源：

COLLOIDS AND SURFACES B-BIOINTERFACES | 2009年 / 68卷 / 01期

关键词：

Carboxylated cross-linked chitosan beads; Defluoridation; Adsorption; Freundlich; Langmuir; SELECTIVE REMOVAL; DRINKING-WATER; METAL-IONS; EQUILIBRIUM; ADSORPTION; DEFLUORIDATION; CARBONS;

D O I：

10.1016/j.colsurfb.2008.09.009

中图分类号：

Q6 [生物物理学];

学科分类号：

071011 ;

摘要：

Carboxylated cross-linked chitosan beads (CCB) showed a significant defluoridation capacity (DC) of 1385 mgF(-)/kg than the raw chitosan beads (CB) which displayed only 52 mgF(-)/kg. Sorption experiments were performed by varying contact time, pH, presence of co-anions and temperature. The nature and morphology of the sorbent were discussed using FTIR and SEM with EDAX analysis. The stability of the beads in solution was explained in terms of swelling ratio of the beads. The fluoride uptake onto CCB obeys both Freundlich and Langmuir isotherms. Thermodynamic studies revealed that the nature of fluoride sorption is spontaneous and endothermic. Sorption kinetics is mainly controlled by pseudo-second-order and intraparticle diffusion models. 0.1 M HCl was identified as the best eluent. The suitability of CCB at field conditions has been tested with field sample collected from a nearby fluoride-endemic area. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：48 / 54

页数：7

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