出版社：Thai Society of Higher Eduction Institutes on Environment
摘要：This study aimed to find the optimum condition to prepare activated charcoal from spent coffee ground and to examine the adsorption efficiency of the BTEX released from water and oil base paints. The optimum condition was found to be carbonization at 400oC for 1 h, followed by activation with H3PO4 at a 1:1 (w/w) impregnation ratio and then carbonizedat 700oC for 1 h. This condition gave the highest iodine number (300.6 ± 5.1 mg/g), Brunaeur-Emmett-Teller (BET)surface area (1,769 m2/g), pore width (0.7947 nm) and pore volume (0.7517 cm3/g). The efficiency of the activated charcoal to adsorb the benzene and toluene emitted from normal and low volatile organic compounds water base paints was 99.8% and 99.7%, respectively. Furthermore, the adsorption efficiency of the activated charcoal from spent coffee ground (96.99 ± 0.54%) to remove the total BTEX released from oil base paints was higher than that achieved with the charcoal without chemical activation (66.97 ± 2.11%) or without carbonization (51.83 ± 10.32%). The produced activated charcoal from spent coffee ground by chemical activation was suitable for use as an adsorbent of the BTEX released from water and oil base paints.
关键词：activated charcoal; adsorption efficiency; BTEX; chemical activation; spent coffee ground
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