Solid-liquid adsorption based on external mass transfer,macropore and micropore diffusion |
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| Affiliation: | 1. Faculty of Science, Department of Physics, Cumhuriyet University, 58140 Sivas, Turkey;2. Dokuz Eylul University, Faculty of Science, Physics Department, 35390 Izmir, Turkey;3. Faculty of Education, Department of Mathematical and Natural Science Education, Cumhuriyet University, 58140 Sivas, Turkey;4. Grupo de Materia Condensada-UdeA, Instituto deFísica, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia;1. Department of Civil and Environmental Engineering, Universitat Politècnica de Catalunya (UPC), Jordi Girona 1-3, 08034 Barcelona, Spain;2. Institute of Environmental Assessment and Water Research (IDAEA), CSIC, c/Jordi Girona 18, 08034 Barcelona, Spain;3. Associated Unit: Hydrogeology Group (UPC-CSIC), Spain |
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| Abstract: | A mass transfer model has been developed based on external film mass transfer, macropore diffusion and micropore diffusion to explain the adsorption of pollutants from aqueous solutions onto adsorbent particles. A computer program has been developed to facilitate analysis of the model in order that theoretical concentration decay curves may be compared with experimental data. A brief comparison has been made for the adsorption of Acid Blue 25 dye on chitin and phenol on carbon. However, the main purpose of the paper is to show the mathematical development of the model using the basic equations of the branched pore theory developed by Peel et al. (1981, A.I.Ch.E. J.27, 26) and undertake a sensitivity analysis to study the effect of changing the four main parameters, namely, the external film mass transfer coefficient, the surface diffusion coefficient, the branched pore rate coefficient and the fraction of total adsorptive capacity in the macropores. |
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