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Adsorption/desorption of phenols onto granular activated carbon in a liquid–solid fluidized bed
Author(s) -
Wang RongChi,
Chang ShihChiang
Publication year - 1999
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(199907)74:7<647::aid-jctb95>3.0.co;2-e
Subject(s) - adsorption , desorption , activated carbon , mass transfer , chemistry , saturation (graph theory) , langmuir adsorption model , chemical engineering , aqueous solution , chromatography , phenol , langmuir , diffusion , analytical chemistry (journal) , organic chemistry , thermodynamics , physics , mathematics , combinatorics , engineering
The adsorption/desorption of phenols in aqueous solution onto coconut‐shell granular activated carbon (GAC) in a liquid–solid fluidized bed adsorber approaching saturation capacity was investigated. Experiments were carried out using a 20 mm id adsorber under a variety of operating conditions including GAC particle sizes (0.937, 1.524 mm), GAC mass (12, 24 g), influent phenol concentration (0.367–1.071 mmol dm −3 ), surface loading of GAC (2.0, 2.5 mmol g −1 ) and liquid flow rate (0.15, 0.2, 0.35 dm 3 min −1 ). The effect of repetitive adsorption/desorption cycles on the adsorption capacity has also been examined for phenol/GAC systems. The model based on the external mass transfer with film‐surface diffusion, surface adsorption equilibrium and internal mass transfer was proposed to simulate the breakthrough curves of the phenol adsorption/desorption process. Using the experimentally measured Langmuir isotherm equilibrium parameters in the model has been found to describe reasonably well the experimental results. © 1999 Society of Chemical Industry