Preparation of bio-silica/chitosan nanocomposite for adsorption of a textile dye in aqueous solutions

Title
Preparation of bio-silica/chitosan nanocomposite for adsorption of a textile dye in aqueous solutions
Author(s)
주상우R. Darvishi Cheshmeh Soltani[R. Darvishi Cheshmeh Soltani]A.R. Khataee[ A.R. Khataee]M. Safari[ M. Safari]
Keywords
HEAVY-METAL IONS; NANO HOLLOW SPHERE; MESOPOROUS SILICA; CATIONIC DYE; ANIONIC DYE; ACID DYES; REMOVAL; CHITOSAN; BIOSORPTION; WATER
Issue Date
201311
Publisher
ELSEVIER SCI LTD
Citation
INTERNATIONAL BIODETERIORATION & BIODEGRADATION, v.85, pp.383 - 391
Abstract
The aim of this study was to evaluate the efficiency of immobilized nanosized bio-silica (average crystalline size of 20 nm) within chitosan as a nanocomposite adsorbent for removing Acid Red 88 (AR88) in aqueous phase. As result, the amount of adsorbed AR88 (mg g(-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 I to 3 g l(-1), while further increment in the adsorbent dosage resulted in an insignificant increase in the adsorption (1.66 mg g(-1)). The kinetic study was performed and the results indicated the suitability of pseudo-second order kinetic model (R-2 = 0.994). Besides, the correlation coefficient of Elovich model confirmed chemical nature of the adsorption (R-2 = 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 (R-2 = 0.9962), the maximum adsorption capacity of bio-silica/chitosan nanocomposite for sequestering AR88 was about 25.84 mg g(-1). In addition, negative Delta G degrees and Delta H degrees values obtained through thermodynamic study indicated that the adsorption of AR88 onto nanocomposite was simultaneous and exothermic in nature, respectively. (C) 2013 Elsevier Ltd. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/28474http://dx.doi.org/10.1016/j.ibiod.2013.09.004
ISSN
0964-8305
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공과대학 > 기계공학부 > Articles
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