Highly efficient and selective transport of Hg2+ ions through a bulk liquid membrane containing Cyanex 301 as carrier

作者：Madaeni S S^*; Islami N; Rofouei M K; Ghader M

来源：Asia-Pacific Journal of Chemical Engineering, 2011, 6(4): 631-638.

DOI：10.1002/apj.463

• mercury ion removal
• nitric acid solutions
• Cyanex 301 carrier
• bulk liquid membrane

Mercury is present in various forms in many industrial wastewaters, and in some natural water sources. In this work, a novel bulk liquid membrane (BLM) system containing bis(2,4,4-trimethyl(pentyl)dithiophosphinic acid (Cyanex 301) as carrier was evaluated for mercury transport and recovery of the ions from acidic nitrate solutions. Cyanex 301 acts as an efficient and selective carrier for the uphill transport of Hg(II) through a chloroform bulk liquid membrane. The selectivity and efficiency of Hg(II) transport from aqueous solutions containing different mixtures of cations were investigated. The fundamental parameters influencing the transport of mercury ion such as concentration of nitric acid in the feed solution, carrier concentrations in the membrane, type of organic solvent, nature and composition of the receiving phase, stirring speed and transport time were determined. Most of the Hg(II) ions (89%) penetrated through the bulk liquid membrane after 120 min using 0.04 M Cyanex 301 in the membrane phase and 5 M HNO3 in the receiving phase. However, the maximum transport (93%) occurred after 140 min at a stirring speed of 200 rpm in the feed and stripping solutions. The present study demonstrates the effectiveness of the bulk liquid membrane system for separating Hg(II) ions in amalgam solutions by combining extraction and stripping operations in a single process.

• 出版日期2011-8