摘要
Supported liquid membranes (SLM) is a highly efficient separation technology combining membrane materials and liquid-liquid extraction. During operation, organic extractant tends to diffuse out of the SLM and the membrane materials degrades in organic extractant, leading to declined flux or selectivity. Due to the instable problem, large scale applications have not been realized yet. In this review, the mechanisms leading to the instability in supported liquid membrane are reviewed. Challenges and milestone of membrane materials in stabilizing the supported liquid membranes are discussed. The application of gelation, coating, interfacial polymerization and plasma coating, hydrophilic-hydrophobic composite material, and ion exchange membranes in stabilization of SLM were discussed in detail. The advantages and disadvantages of various materials in terms of stabilization of SLM were compared. Finally, a new type of membrane material, a sufonated polymer was evaluated as the coating polymer for the improvement of membrane permeability and stability. The sulfonated polymer coated composite membrane based membrane contactor system was introduced and the sulfonated polymer-based blend material is proposed as the new development direction for membrane materials to improve the liquid membrane stability. It is envisioned that the new type membrane material would find applications in separation and purification of precious metal ions and energy metal ions.
