Influence of Pore Properties and Solution pH on Removal of Free Chlorine and Combined Chlorine by Porous Carbon

摘要

The removal performance of free chlorine and combined chlorine by bamboo charcoals carbonized at 400癈 (BC400), 700癈 (BC700) and 1000癈 (BC1000) and commercial activated carbon (AC) was examined. The removal performance of the free chlorine tended to increase with an increase in the total pore volume and the Brunauer Emmett and Teller (BET) surface area. However, the removal of the free chlorine was found to be related not only to the BET surface area and the total pore volume of the porous carbon, but also to the pH of the test solution. The removal performance of the combined chlorine by AC was the highest for all the porous carbons, and that by BC400 was the highest in the bamboo charcoal, opposite that of the removal performance of the free chlorine. The combined chlorine removal performance by BC1000 was greater than that by BC700. Although it is thought that a porous carbon having large surface area is effective for the removal of combined chlorine, the removal performance by BC400 with the smallest surface area was greater than that by BC700 and BC1000. The solution pH rather than the BET surface area and the total pore volume influenced the removal performance of the combined chlorine. Consequently, the removal performance of the free chlorine and combined chlorine by the porous carbon was effective under acidic conditions.