Repository of Research and Investigative Information

Repository of Research and Investigative Information

Kurdistan University of Medical Sciences

Application of Nanocrystalline Iranian Diatomite in Immobilized Form for Removal of a Textile Dye

(2016) Application of Nanocrystalline Iranian Diatomite in Immobilized Form for Removal of a Textile Dye. Journal of Dispersion Science and Technology.

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Official URL: https://www.scopus.com/inward/record.uri?eid=2-s2....

Abstract

The aim of the present investigation was to immobilize nanocrystalline 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 infrared (FTIR) spectroscopy were used to characterize the samples. As a result, 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 (�G°) and positive value of enthalpy change (�H°) indicated spontaneous and endothermic nature of the process. © 2016, Copyright © Taylor & Francis Group, LLC.

Item Type: Article
Keywords: Adsorption; Azo dyes; Fourier transform infrared spectroscopy; Free energy; Gibbs free energy; Isotherms; Radioactive waste vitrification; Scanning electron microscopy; X ray diffraction, Adsorption capacities; Adsorption process; Endothermic nature; Initial dye concentration; Langmuir isotherm models; Nano-structured; nanobiocomposite; Pseudo-second-order kinetic models, Nanocrystals
Page Range: pp. 723-732
Journal or Publication Title: Journal of Dispersion Science and Technology
Volume: 37
Number: 5
Publisher: Taylor and Francis Inc.
Identification Number: 10.1080/01932691.2015.1058715
ISSN: 01932691
Depositing User: مهندس جمال محمودپور
URI: http://eprints.muk.ac.ir/id/eprint/571

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