(2013) Preparation of bio-silica/chitosan nanocomposite for adsorption of a textile dye in aqueous solutions. International Biodeterioration and Biodegradation.
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Abstract
The aim of this study was to evaluate the efficiency of immobilized nanosized bio-silica (average crystalline size of 20nm) within chitosan as a nanocomposite adsorbent for removing Acid Red 88 (AR88) in aqueous phase. As result, the amount of adsorbed AR88 (mgg-1) was increased with increasing reaction time and adsorbate concentration and decreasing temperature and initial pH. A rapid increment in the adsorption was happened with increasing adsorbent dosage from 1 to 3gl-1, while further increment in the adsorbent dosage resulted in an insignificant increase in the adsorption (1.66mgg-1). The kinetic study was performed and the results indicated the suitability of pseudo-second order kinetic model (R2=0.994). Besides, the correlation coefficient of Elovich model confirmed chemical nature of the adsorption (R2=0.9756). The fitness of experimental data to the intra-particle diffusion model demonstrated that the adsorption process occurred via a multi-step mechanism. But, the intra-particle diffusion was not the sole rate-limiting stage. According to the Langmuir isotherm model (R2=0.9962), the maximum adsorption capacity of bio-silica/chitosan nanocomposite for sequestering AR88 was about 25.84mgg-1. In addition, negative δG° and δH° values obtained through thermodynamic study indicated that the adsorption of AR88 onto nanocomposite was simultaneous and exothermic in nature, respectively. © 2013 Elsevier Ltd.
Item Type: | Article |
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Keywords: | Adsorbate concentration; Average crystalline size; Bio-silica; Correlation coefficient; Intra-particle diffusion; Langmuir isotherm models; Organic dye; Pseudo-second-order kinetic models, Azo dyes; Biopolymers; Diffusion in solids; Kinetic theory; Nanocomposites; Silica, Adsorption, adsorption; aqueous solution; chitin; correlation; diffusion; dye; numerical model; pH; reaction kinetics; silica |
Page Range: | pp. 383-391 |
Journal or Publication Title: | International Biodeterioration and Biodegradation |
Volume: | 85 |
Identification Number: | 10.1016/j.ibiod.2013.09.004 |
ISSN: | 09648305 |
Depositing User: | مهندس جمال محمودپور |
URI: | http://eprints.muk.ac.ir/id/eprint/1267 |
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