첨착활성탄에 의한 중금속 흡착에 관한 연구

Abstract

The result of impregnating granular active carbon and palletized active carbon with KSCN, Na₂S and Na₂C₂O₄ to produce impregnated active carbon to examine the adsorption characteristics of heavy metals such as Cu²+, Cd²+ and Cr³+ are as follows. 1. Adsorption of impregnated active carbon based on pH is lowest at pH 2 for all three heavy metals and most satisfactory at pH 6, rate of removal by impregnating agent at pH 4～8 was in the order of KSCN>Na₂S>Na₂C₂O₄ for Cu²+ and Na₂S>KSCN>Na₂C₂O₄ for Cd²+ and Cr³+ 2. KSCN impregnated active carbon has excellent adsorption for Cu²+, and Na₂S and Na₂C₂O₄ impregnated active carbons have excellent adsorption for Cr³+. For each type of activated carbon, adsorption capacity by impregnating agent for Cu²+ was greater in granular carbon than palletized carbon, and was in the order of KSCN>Na₂S>Na₂C₂O₄; Adsorption capacity for Cd²+ was greater in granular carbon than palletized carbon and was in the order of Na₂S>KSCN>Na₂C₂O₄; and adsorption capacity for Cr³+ by type of activated carbon was less in granular carbon than palletized carbon and was in the order of Na₂S >Na₂C₂O₄>KSCN. 3. Time to reach adsorption equilibrium for impregnated active carbons was 4～30 minuets for Cu²+, 4～15 minutes for Cd²+, and 4～8 minutes for Cr³+, and by impregnating agent, Adsorption equilibrium was reached in the order Na₂C₂O₄> KSCN>Na₂S for Cu²+, for Cd²+, Na₂S and Na₂C₂O₄-impregnated activated carbons reached adsorption equilibrium more rapidly than KSCN- impregnated activated carbon, and for Cr³+, adsorption equilibrium of Na₂S and Na₂C₂O₄-impregnated activated carbons were reached slower than KSCN-impregnated activated carbon. 4. Due to adsorption, 1/n value of activated carbons for Cu²+, Cd²+ and Cr³+ decreased from 0.54～0.84 to 0.38～0.49 which improved adsorption in liquid phase, and by type, that of Cu²+ and Cd²+ are similar for Cr³+, granular impregnated activated carbon is slightly greater than palletized impregnated activated carbon. 5. As a result of impregnation, the K value of activated carbon for Cu²+, Cd²+ and Cr³+ i ncreased 149～626%, improving adsorption capacity of activated carbons, and by type, K values of granular impregnated activated carbon for Cu²+ and Cd²+ were slightly greater than that of palletized impregnated activated carbon, for Cr³+, that of granular impregnated activated carbon was found to be 13.1～21.5 less.