Abstract
Activated carbon (AC) was modified with sodium citrate at a concentration of 5–15% by impregnation to develop a new type of adsorbent, named N x –AC where x is the concentration. Their pore structures and surface chemical properties were characterized by N 2 adsorption, Boehm titration and FT-IR. The adsorption of copper ions by the N x –AC and the regenerated ones were investigated through a static adsorption method. Results showed that the carboxyl content had a great influence in the adsorption properties of N x –AC for copper with the adsorption capacity of N 15 –AC being 1.76 times higher than the parent AC, which was higher than those of the N 5 –AC and the N 10 –AC. The adsorption capacity of the regenerated N 15 –ACs for copper can reach 98.2% and 95.9% of the original N 15 –AC for the first and second regenerations, respectively. [New Carbon Materials 2013, 28(2): 156–160]
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