Application of Nanocrystalline Iranian Diatomite in Immobilized Form for Removal of a Textile Dye |
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| Authors: | Reza Darvishi Cheshmeh Soltani Afshin Maleki Hatam Godini Mohammad Hassan Mahmoudian Mohammad Amin Pordel |
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| Institution: | 1. Department of Environmental Health Engineering, School of Health, Arak University of Medical Sciences, Arak, Irandarvishi@arakmu.ac.ir;3. Environmental Health Research Center, Kurdistan University of Medical Sciences, Sanandaj, Iran;4. Department of Environmental Health Engineering, Faculty of Health, Lorestan University of Medical Sciences, Khorramabad, Iran;5. Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran |
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| 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 (ΔG°) and positive value of enthalpy change (ΔH°) indicated spontaneous and endothermic nature of the process. |
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| Keywords: | Adsorption azo dye immobilization nanobiocomposite nanostructured diatomite |
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