| Title |
A Study on the Heavy Metal Adsorption of Modified Activated Carbon Utilizing Chitosan |
| Authors |
이순홍 ( Lee Sun Hong ) ; 박종철 ( Park Jong Cheol ) |
| Keywords |
modified activated carbon; chitosan; heavy metal ions; ultrasonic and stirring treatment; chitosan-acid solutions; coupling solution |
| Abstract |
In order to enhance the adsorption capacity of harmful heavy metal ions such as Cr(Ⅵ), Cu(Ⅱ), Pb(Ⅱ) and Fe(Ⅱ) from aqueous solution, the modified activated carbon(MAC) was made through the processes of ultrasonic and stirring treatment to increase the contact probability between the activated carbon and chitosan-acid solutions(1wt%-acrylic acid, acetic acid). Chitosan with high molecular weight-acid solutions was used as a coupling solution for existing many chemical adsorption sites onto the activated carbon exterior Surface and micropore, Specific surface area, micropore distribution and micropore diameter of MAC and pure activated carbon were very similar each other by BET measurement. These results suggest that the pore blocking phenomenon hardly occur during the modillcallon processes wth chitosan-acid solution. The amount of removed Cr (Ⅵ) by MAC was mostly higher than that 01 pure activatea carbon independently of pH. adsorption time and dosage at the same conditions. Regardless of the composition of heavy metal ions in the aqueous solution. the adsorption capacity of MAC for heavy metal ions was in the order of Cr (Ⅵ) > Fe(Ⅱ) > Cu(Ⅱ) > Pb(Ⅱ). Therefore. Cr(Ⅵ) can be preferentially removed in the wastewater containing Cr(Ⅵ) and other heavy metal ions |