Adsorption of methyl violet dye onto a prepared bio-adsorbent from date seeds: isotherm, kinetics, and thermodynamic studies.
| Autor: | Ali NS; Mustansiriyah University, College of Engineering, Materials Engineering Department, Baghdad, Iraq., Jabbar NM; Biochemical Engineering Department, Al-Khwarizmi Engineering College, University of Baghdad, Baghdad, Iraq., Alardhi SM; Nanotechnology and Advanced Materials Research Center, University of Technology, Iraq., Majdi HS; Chemical Engineering Department and Petroleum Industries, Al-Mustaqbal University College, Babylon 51001, Iraq., Albayati TM; Chemical Engineering Department, University of Technology- Iraq, 52 Alsinaa St., PO Box 35010, Baghdad, Iraq. |
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| Jazyk: | angličtina |
| Zdroj: | Heliyon [Heliyon] 2022 Aug 15; Vol. 8 (8), pp. e10276. Date of Electronic Publication: 2022 Aug 15 (Print Publication: 2022). |
| DOI: | 10.1016/j.heliyon.2022.e10276 |
| Abstrakt: | Raw date seeds, as prospective natural, broadly obtainable and low-price agricultural waste for adsorbing cationic dyes from aqueous solutions, have been studied. In this work, Iraqi date seeds were prepared and characterised using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy and Brunauer-Emmett-Teller (BET) surface area analysis before being used as an efficient bio-adsorbent for methyl violet (MV) dye removal. Adsorption tests were conducted with three investigated parameters, namely, time of contact, first adsorbate concentration and adsorbent dose. Compared with the pseudo first-order model (coefficient of determination = 0.9001), the pseudo second-order model was determined to be the best-fitting model with a coefficient of determination (R 2 ) of 0.9917. The equilibrium isotherms for MV were obtained, and their ultimate capacity of adsorption was (59.5 mg g 1 ). Two isotherm models, Langmuir and Freundlich, were studied to fit the equilibrium data. Compared with the Freundlich isotherm model (R 2 = 0.8154), the Langmuir model functioned better as an adsorption isotherm with R 2 of 0.9837. In addition, the adsorption process was endothermic and spontaneous. The date seeds acted as active adsorbents to remove MV from the aqueous solutions in the model experiments. Competing Interests: The authors declare no conflict of interest. (© 2022 The Author(s).) |
| Databáze: | MEDLINE |
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