Branched-pore model applied to the adsorption of basic dyes on carbon |
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Affiliation: | 1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China;2. Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing, 100095, China;3. Institutes of Physical Science and Information Technology, Anhui University, Hefei, 230601, China;4. Institute of Materials Science, University of Stuttgart, Heisenbergstraße 3, D-70569, Stuttgart, Germany |
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Abstract: | The branched-pore adsorption model, expressed by an external mass transfer coefficient kf, a solid diffusivity Ds, a lumped micropore diffusion rate parameter kb, and the fraction of macropores f, describes kinetic data from initial contact of adsorbent-adsorbate to the long-term ( > 24 hours) adsorption stages with reasonable accuracy.In this work the model is applied for three basic dye systems, namely Basic Red 22, Basic Yellow 21 and Basic Blue 69, all on carbon. A single value of each parameter describes each dye system. The kf values are 0.18 × 10−2±28%, 0.3 × 10−2±17% and 0.2 × 10−2 ± 20% cm s−1, the Ds values are 0.33 × 10−9 21%, 0.72 × 10−9 ± 9% and 0.72 × 10−9 ± 9% cm2 s−1, the kb values are 0.65 × 10−6 ± 7.7%, 1.8 × 10−6 0.2 × 10−6 1% s−1, while the f values are 0.55 ± 9%, 0.60 ± 10 % and 0.18 ± 11%, each for Basic Red 22, Basic Yellow 21 and Basic Blue 69 respectively.The model is based on the internal structure of the carbon particle being divided into a macropore and a micropore region. The latter has an upper-bound capacity of 241, 245 and 656 mg g−1 for Basic Red 22, Basic Yellow 21 and Basic Blue 69 respectively. A sensitivity analysis for each parameter has been carried out. |
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