Application of nano-crystalline Iranian diatomite in immobilized form for removal of a textile dye

Safari, Mahdi and Darvishi Cheshmeh Soltani, Reza and Maleki, Afshin and Godini, Hatam and Pordel, Mohammad Amin (2015) Application of nano-crystalline Iranian diatomite in immobilized form for removal of a textile dye. Journal of Dispersion Science and Technology.

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Abstract

The aim of the present investigation was to immobilize nano-crystalline diatomite within calcium alginate matrix for the adsorption of Direct Red23 (DR23) in aqueous media. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infra-red (FT-IR) spectroscopy were used to characterize the samples. As results, the adsorption process obeyed pseudo-second order kinetic model (R2=0.9934) and Langmuir isotherm model (R2=0.9732) with a maximum adsorption capacity of 24.10 mg/g. The value of mean free energy (15.81 kJ/mol) demonstrated that the process has been taken place chemically. As the adsorbent dosage increased from 0.5 to 3.0 g/L, the decolorization efficiency (%) increased from 26.0 to 75.5%, respectively. Inversely, the decolorization efficiency (%) decreased from 98.0 to 29.0% with increasing initial dye concentration from 5 to 160 mg/L, respectively. The negative values obtained for Gibbs free energy (ΔG◦) and positive value of enthalpy change (ΔH◦) indicated spontaneous and endothermic nature of the process.KEYWORDS: Adsorption; Nanostructured diatomite; Azo dye; Immobilization; Nanobiocomposite

Item Type: Article
Subjects: R Medicine > RZ Other systems of medicine
Depositing User: sobhan rezaiian
Date Deposited: 25 Sep 2016 05:58
Last Modified: 25 Sep 2016 05:58
URI: http://eprints.lums.ac.ir/id/eprint/180

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