## Abstract

The branched-pore adsorption model, expressed by an external mass transfer coefficient k_{f}, a solid diffusivity D_{s}, a lumped micropore diffusion rate parameter k_{b}, 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 k_{f} values are 0.18 × 10^{-2}±28%, 0.3 × 10^{-2}±17% and 0.2 × 10^{-2} ± 20% cm s^{-1}, the D_{s} values are 0.33 × 10^{-9} 21%, 0.72 × 10^{-9} ± 9% and 0.72 × 10^{-9} ± 9% cm^{2} s^{-1}, the k_{b} 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.

Original language | English |
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Pages (from-to) | 1-13 |

Number of pages | 13 |

Journal | Chemical Engineering and Processing - Process Intensification |

Volume | 24 |

Issue number | 1 |

DOIs | |

Publication status | Published - 1988 |

Externally published | Yes |