Extraction of copper ions by supercritical carbon dioxide

摘要

Complexation combined with supercritical fluid extraction was used to extract Cu~2+ in this study. The effects of pressure, temperature, volume of CO_2 on the efficiency of extraction were systematically investigated. At the optimum condition a 57.32/100 recovery was achieved. Addition of suitable amount of methanol(v/v=5/100) to the supercritical CO_2 can increase in the extraction of Cu~2+(72.69/100, RSD=2.12/100, n=3). And the recovery can further increase in the presence of non-ionic surfactant Triton X-100 because of its function of solubilization. Surfactant was first used in the extraction of metal ions in the present study, and the results are satisfied (90.52/100, RSD=2.20/100, n=3).