Abstract
Because of the high energy costs involved in using the MixAlco process in the separation of fermentation water, it is necessary to implement a separation method in which the absorbates can be adsorbed onto activated carbon (AC). For this purpose, in this study, we synthesized AC from watermelon shells (CAS) and the synthesized carbon was modified with NaOH (CASM) in order to improve its adsorption efficiency. Adsorption kinetic studies of short-chain carboxylic acids (acetic acid, propionic acid and butyric acid) onto the synthesized ACs were performed. The CASM had an adsorption efficiency of 71%, 70% and 63% for acetic acid, propionic acid and butyric acid, respectively. This efficiency was higher than that of CAS, which presented an efficiency of 32%, 30% and 27% for the respective acids. The AC from watermelon shells was synthesized by chemical activation with phosphoric acid (40% wt/wt), producing a yield of 84%. The carbon was modified by adding 10M NaOH. Finally, the physical and chemical character...
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