Fly ash as a sorbent for boron removal from aqueous solutions: Equilibrium and thermodynamic studies |
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| Authors: | Justyna Ulatowska Izabela Polowczyk Anna Bastrzyk Tomasz Ko?lecki Wojciech Sawiński |
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| Affiliation: | 1. Faculty of Chemistry, Division of Chemical Engineering, Wroclaw University of Science and Technology , Wroc?aw, Poland justyna.ulatowska@pwr.edu.pl;3. Faculty of Chemistry, Division of Chemical Engineering, Wroclaw University of Science and Technology , Wroc?aw, Poland |
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| Abstract: | ABSTRACT This study presents the application of fly ash from brown coal and biomass burning power plant as a sorbent for the removal of boron ions from an aqueous solution. The adsorption process efficiency depended on the parameters, such as adsorbent dosage, pH, temperature, agitation time and initial boron concentration. The experimental data fitted well with the Freundlich isotherm model and the maximum capacity was found to be 16.14 mg g?1. The adsorption kinetics followed the pseudo-second-order model. Also, the intra-particle diffusion model parameters were calculated. Thermodynamic parameters such as change in free energy (ΔG°), enthalpy (ΔH°), entropy (ΔS°) revealed on exothermic nature of boron adsorption onto the fly ash. |
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| Keywords: | Boron removal fly ash adsorbent adsorption isotherms thermodynamic parameters kinetic models |
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