The Effect of Activation Time on The Chemical Structure and Quality of Activated Carbon From Coconut Shell Charcoal Using Zncl_2 Activator

摘要

The study on the preparation and preparation of activated carbon from coconut shell charcoal via the combined chemical (ZnCl_2) and physical (CO_2) activations has been carried out. This study was aimed to study the chemical change occurred during the activation. The charcoal was immersed in the solution of ZnCl_2, where the concentration of solution (0.5-2.0 M) and the immersion time (12-24 h) were varied. Then, the physical activation was carried out at 800°C with the variation of time (30-150 min) and it was streamed using CO_2 (20 mL/min) for 2 h. Characterization of the activated carbon include FTIR, SEM, BET and XRD analyses. The FTIR analysis showed that the surface of the activated carbon had the functional groups of - OH, C-H and C-O. The XRD analysis showed that the activated carbon was amorphous. The SEM analysis showed that the pore was more porous, the pore diameter increased by the increasing of activation time. The activated carbon with the best quality was obtained with the condition of concentration of ZnCl_2 of 1.5 M, immersion time of 24 h and activation time of 120 min. At such condition, the activated carbon had the surface area (BET) of 359.286 m~2g~(-1) pore volume of 1.984 × 10~(-1) cm~3g~(-1) and average pore radii of 11.04 ?.