Extraction of copper ions by supercritical carbon dioxide

Article type: Research Article

Authors: Cui, Zhao-jie | Liu, Jun-cheng | Gao, Lian-cun | Wei, Ying-qin

Affiliations: Department of Environmental Engineering, Shandong University, Jinan 250100, China

Abstract: 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% recovery was achieved. Addition of suitable amount of methanol (v/v = 5 % ) to the supercritical CO_2 can increase in the extraction of Cu^2+ (72.69 %, RSD = 2.12 %, 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%, RSD=2.20%, n =3).

Keywords: supercritical fluid extraction, metal ions, chelating agent, modified, surfactant

Journal: Journal of Environmental Sciences, vol. 12, no. 4, pp. 444-447, 2000