Indian Journal of Chemical Technology, Vol.21, No.5-6, 345-349, 2014
Adsorption of VOC on steam activated carbon derived from coconut shell charcoal
The activated carbon AC1, AC2 and AC3 are produced from the coconut shell charcoal with different levels of activation by steam and temperatures of 800 degrees C, 850 degrees C and 900 degrees C. The AC3 activated at 900 degrees C show about 50 m(2)/g of higher surface area than AC1 and AC2 which are activated at 800 degrees C and 850 degrees C, respectively. The maximum BET surface area and iodine sorption on AC3 are found to be 1262 m(2)/g and 1194 mg/g respectively. Adsorption capacity of all the three activated carbon has been examined with volatile organic pollutants, carbon tetrachloride, benzene, ether and n-pentane. The order of adsorption is CTC > benzene > ether > n-pentane. An empirical relationship between VOC and iodine number is obtained for the activated carbon samples. This clearly shows that the adsorption capacity depends on the attractive forces between the AC and nature of pollutant. Kinetic data reveals the uniform distribution of pores in all the activated carbon irrespective of the activation temperature.