Adsorption/desorption of phenols onto granular activated carbon in a liquid–solid fluidized bed
✍ Scribed by Rong-Chi Wang; Shih-Chiang Chang
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1999
- Tongue
- English
- Weight
- 161 KB
- Volume
- 74
- Category
- Article
- ISSN
- 0268-2575
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✦ Synopsis
The adsorption/desorption of phenols in aqueous solution onto coconut-shell granular activated carbon (GAC) in a liquid±solid ¯uidized 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), in¯uent phenol concentration (0.367±1.071 mmol dm À3 ), surface loading of GAC (2.0, 2.5 mmol g À1 ) and liquid ¯ow rate (0.15, 0.2, 0.35 dm 3 min À1 ). 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 ®lm-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.