Optimization of activated carbon fiber preparation from Kenaf using K₂HPO₄ as chemical activator for adsorption of phenolic compounds
2009
Aber, Soheil | Khataee, Alireza | Sheydaei, Mohsen
The present work reports the preparation of activated carbon fiber (ACF) from Kenaf natural fibers. Taguchi experimental design method was used to optimize the preparation of ACF using K₂HPO₄. Optimized conditions were: carbonization at 300°C, impregnation with 30%w/v K₂HPO₄ solution and activation at 700°C for 2h with the rate of achieving the activation temperature equal to 2°Cmin⁻¹. The surface characteristics of the ACF prepared at optimized conditions were also studied using pore structure analysis, scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) spectroscopy. Pore structure analysis shows that micropores constitute the most of the porosity of the prepared ACF. The ability of the ACF prepared at optimized conditions to adsorb phenol and p-nitrophenol from aqueous solution was also investigated. The equilibrium data of phenol and p-nitrophenol adsorption on the prepared ACF were well fitted to the Langmuir isotherm. The maximum adsorption capacities of phenol and p-nitrophenol on the prepared ACF are 140.84 and 136.99mgg⁻¹, respectively. The adsorption process follows the pseudo-first-order kinetic model.
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