PREPARATION OF LIGNIN-BASED CARBONACEOUS ADSORBENT

The carbonaceous adsorbent was prepared by cross-linking and activation using phosphoric acid as an activation agent. The influence of activation temperature, impregnation ratio and activation time were studied. With increasing activation temperature, iodine adsorption value went down significantly. On the contrary, methylene blue adsorption value was improved. While the impregnation ratio and activation time were increased, both of them had various degrees of increase. The adsorption capacity of iodine, methylene blue of carbonaceous sorbent, which was prepared under optimum conditions of 400 degrees C of activation temperature, 4:1 of impregnation ratio and 2 hour of activation time, were 713mg/g, 60mg/g, respectively. It could be concluded that apertures of the sorbent which was made from cross-linked product of lignin in the experiment, were mainly microporous.