| 초록 |
The adsorption capacity of Ru3+ on ACF(activated carbon fiber) and CNT(carbon nanotube) from RuCl33H2O dissolved aqueous solution was investigated as a function of pH at various conditions. When the initial Ru3+ content was adjusted to 1000 ppm, the adsorption capacities of Ru3+ on ACF and CNT were 20, 18 wt%, respectively at the equilibrium state. Adsorption amount of Ru3+ on porous carbon was dependent on the specific surface area and pH of solution. Adsorption capacity of Ru3+ on ACF increased slowly from 20% to 22% between pH 1.9 (initial pH of solution) and pH 3.0, while adsorption capacity increased more sharply from pH 3.0 and reached to the maximum value (54%) at around pH 3.7. However, adsorption capacity decreased very rapidly over the pH 3.7, which resulted from precipitation of the ionized Ru3+ by increase of solution pH in the pH 3.7 ranges. Therefore, optimized pH condition of ruthenium loading on ACF was considered between pH 3.5 and 3.7. Adsorption capacity of Ru3+ on ACF was a little better than CNT due to the only micropores and larger specific surface area. Ru3+ loaded ACF was obatained from impregnation of Ru3+ and then direct heating the Ru3+ impregnated ACF up to 400 ℃. |
