STUDY OF THE ADSORPTION OF BENZENE-CONTAINING OFF-GASES ON A MODIFIED ACTIVE CARBON

Active carbon adsorption is an effective method for the treating low concentration benzene in industrial waste gases. On preparing active carbon with a high adsorption ability and low cost, active carbons from coal were studied. The active carbon was modified by removing impurities using both acid and base treatments. In this way the ash content was reduced and the specific surface area was increased with an accompanying improvement in the adsorption. By studying the effects of different modifying methods on saturation adsorption, specific surface area, pore radius, specific surface area and ash content, the best procedure was determined. The results clearly show that the method of treating coal based active carbon by acid and base is simple and effective for increasing adsorption ability and specific surface area.