Xue Juan Qin, Liu Ni Na, Li Guo Ping, Dang Long Tao
School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, China E-mail:
Water Sci Technol. 2017 Dec;76(11-12):3142-3149. doi: 10.2166/wst.2017.443.
This work evaluated the performance of ionic liquids (ILs) in supported liquid membranes in the removal of total cyanide from wastewater. Membranes were characterized by scanning electron microscopy and contact angle measurements to study the membrane morphology and wetting ability. In particular, the effects of operational parameters such as membrane immersion time, feed-phase concentration, and pH on cyanide removal were investigated. ILs are organic salts that are entirely composed of organic cations and either organic or inorganic anions. Since their vapor pressure is negligible, they can be handled easily; this characteristic gives rise to their 'green' nature. In this study, a hydrophobic IL, 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim]PF), was immobilized in the pores of a solid polymeric support made of polyvinylidene fluoride. The optimal conditions were as follows: 1 hour membrane immersion time, 312.24 mg/L feed-phase concentration, a feed-phase pH of 4, 3% NaOH solution, and 1 hour stirring time. The cyanide removal was 95.31%. The treatment of cyanide using supported ionic liquid membrane (SILM) technology is a method with potential applications in industry.
本研究评估了离子液体（ILs）在支撑液膜中去除废水中总氰化物的性能。通过扫描电子显微镜和接触角测量对膜进行表征，以研究膜的形态和润湿能力。特别研究了膜浸泡时间、进料相浓度和pH值等操作参数对氰化物去除的影响。离子液体是完全由有机阳离子和有机或无机阴离子组成的有机盐。由于其蒸气压可忽略不计，因此易于处理；这一特性赋予了它们“绿色”的性质。在本研究中，一种疏水性离子液体1-丁基-3-甲基咪唑六氟磷酸盐（[Bmim]PF）被固定在由聚偏二氟乙烯制成的固体聚合物载体的孔中。最佳条件如下：膜浸泡时间1小时、进料相浓度312.24 mg/L、进料相pH值为4、3%氢氧化钠溶液以及搅拌时间1小时。氰化物去除率为95.31%。使用支撑离子液体膜（SILM）技术处理氰化物是一种在工业上具有潜在应用的方法。
