| ABSTRACT |
Activated carbons were prepared from rambutan seed by chemical activation with ZnCl2 as dehydrating agent. In order to find its characteristic, different impregnation ratio of ZnCl2 to rambutan seed (0.5 and 2) and carbonization temperature (450 °C and 650 °C) was employed. The carbonization occurred in a tube furnace with nitrogen flow at rate of 0.5 L/min. The results showed that at higher impregnation ratio and carbonization temperature produced a wider BET surface area of activated carbon that was 9.8761 m²/g. Total pore volume also increased with increases of these two factors. However, activation yield was decreased with increasing of carbonization temperature. Activated carbon then were tested on synthetic wastewater with pH 11 to study its pH reduction upon contact time and adsorbent dosage. Reduction of pH ranging 6.2 to 6.8 with employment of 2g/100ml adsorbent dosage at 180 minutes contact time
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