Effects of type of adsorption isotherms on parallel diffusion of sulfonated dyes into porous cellulose membrane |
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| Authors: | M Maekawa K Murakami H Yoshida |
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| Institution: | (1) Division of Life Science and Human Technology, Nara Women's University, 630 Nara, Japan;(2) Department of Chemical Engineering, University of Osaka Prefecture, 593 Sakai Osaka, Japan |
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| Abstract: | Transport phenomenon of three sulfonated azo dyes, C.I. Acid Red 88, C.I. Direct Yellow 12, and C.I. Direct Blue 15 into water-swollen cellulose membranes has been analyzed on the basis of parallel transport theory by surface and pore diffusion. Langmuir equation was applied into the mass balance equation to estimate dye concentration in the pores. The results were compared with the results obtained by applying Freundlich equation in our previous papers. The surface diffusivity (D
s) and the pore diffusivity (D
p) for the parallel diffusion model obtained by applying Langmuir equation agreed with those obtained by applying Freudlich equation. The theoretical concentration profiles for parallel diffusion calculated usingD
s andD
p coincided accurately with the experimental data when we applied either Langmuir or Freundlich equations. |
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| Keywords: | Parallel diffusion surface diffusion pore diffusion adsorption isotherm cellulose membrane sulfonated dye |
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