Facilitated Transport of Cd(II) Through a Supported Liquid Membrane with Aliquat 336 as a Carrier

• Published in: Separation science and technology 2011-03, Vol.46 (5), p.754-764
• Main Authors: Altin, Süreyya, Alemdar, Sonay, Altin, Ahmet, Yildirim, Yılmaz
• Format: Article
• Language: English
• Subjects: Aliquat; Aliquat 336; Cadmium; Carrier density; Cd(II) removal; facilitated transport; Flow rate; Membranes; metal separation; Stripping; supported liquid membrane; Transport; Waste water
• ISSN: 0149-6395; 1520-5754
• DOI: 10.1080/01496395.2010.537726

Selective removal of cadmium from wastewaters is very important, because cadmium is toxic for the environment and for human health. This work is a comprehensive study on the selective removal of Cd(II) from aqueous solutions by using a co-current flow flat sheet supported liquid membrane system. 4.4 × 10 −4  M Cd(II) concentration was used as a feed solution in the experiments. Toluene containing Aliquat 336 was used as the membrane liquid in the membrane system. Parameters such as the properties of feed and stripping solutions, carrier concentration, and flow rate, which have roles in transport of Cd(II) ions, were optimized. The efficiency of the system is expressed in terms of permeability and flux values, and transport efficiency. The optimum process conditions for the Cd(II) transport are experimentally found as follows: The feed solution as 2 M HCl, the carrier concentration as 0.1 M Aliquat 336, the stripping solution as 0.06 M EDTA, and the flow rates for the feed and stripping solutions as 50 mL/min and 80 mL/min, respectively. Under these conditions, the Cd(II) transport efficiency is found to be 82%.