(2020) BIOSORPTION OF PHENOL USING MODIFIED BARLEY HUSK: STUDIES ON EQUILIBRIUM ISOTHERM, KINETICS, AND THERMODYNAMICS OF INTERACTIONS. Sigma Journal of Engineering and Natural Sciences-Sigma Muhendislik Ve Fen Bilimleri Dergisi. pp. 1161-1177. ISSN 1304-7205
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Abstract
Phenol (PHEN) adsorption using hydrogen chloride (HCl) modified barley husk (MBH) was studied, in which the effects of MBH dose (0.5-4 g/L), initial pH (3-11), contact time (10-180 min), and initial PHEN concentration (10-100 mg/L) were investigated. The adsorbent material was prepared via the chemical activation method. The MBH morphological properties with the surface chemistry characteristics were studied through the Brunauer-Emmett-Teller (BET) surface area, scanning electron microscopy (SEM), Energy Dispersive Xray Microanalysis (EDX), Fourier-transform infrared (FTIR), and point of zero charge (pHpzc) analyses. The data was examined using the four common models of isotherm (Freundlich, Langmuir, Dubinin-Radushkevich (D-R), and Temkin). The pseudo-first-order, pseudo-second-order, and the intra-particle diffusion models were also used to examine the data. Thermodynamics parameters: free energy change (Delta G degrees), enthalpy change (Delta H degrees) and entropy change (Delta S degrees) were evaluated. MBH was highly efficient due to its high surface area (176.2 m(2)/g). Maximum removal of PHEN (93.95) occurred at pH 3, MBH dose: 3 g/L, PHEN concentration: 10 mg/L, and contact time: 180 min at a constant temperature of 30 +/- 2 degrees C. The D-R isotherm and pseudo-second-order best represented the isotherm and kinetic data, respectively. The values of Delta G degrees (-0.056, -0.613, -1.431, -2.052, -2.941 and -3.731 kJ/mol), Delta H degrees (23.88 kJ/ mol) and Delta S degrees (0.087 kJ/mol K) indicate a feasible, spontaneous and endothermic adsorption process. MBH, a low-cost adsorbent can be used effectively to remove PHEN from PHEN-containing water.
Item Type: | Article |
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Keywords: | Phenol barley husk adsorption iotherms thermodynamics kinetics aqueous-solutions waste-water bisphenol-a activated carbon o-chlorophenol removal adsorption dye residues straw Engineering |
Divisions: | |
Page Range: | pp. 1161-1177 |
Journal or Publication Title: | Sigma Journal of Engineering and Natural Sciences-Sigma Muhendislik Ve Fen Bilimleri Dergisi |
Volume: | 38 |
Number: | 3 |
ISSN: | 1304-7205 |
Depositing User: | مهندس مهدی شریفی |
URI: | http://eprints.zbmu.ac.ir/id/eprint/3437 |
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