Centro Nacional de Investigaciones Metalurgicas (CSIC), Avda. Gregorio del Amo 8, 28040 Madrid, Spain.
Molecules. 2019 Jul 2;24(13):2437. doi: 10.3390/molecules24132437.
Chromium(VI) is a well-known hazardous element, thus, its removal from aqueous sources is of a general concern. Among the technologies used for the removal of this type of toxic elements, liquid membranes are gaining in importance and the same has occurred with the use of ionic liquids, considered for many, due to their properties, as green solvents. Thus, the present work joined the three previous points, presenting an experimental study about the removal of chromium(VI) by the use of a liquid membrane operation which used the commercially available Cyphos IL102 ionic liquid as a carrier. The experimental variables included: the stirring speed applied to the feed and receiving solution (a key-parameter to gain maximum transport), acid, chromium(VI), sodium hydroxide and Cyphos IL102 concentrations in their various phases. Additionally, the performance of the present system was evaluated both against the presence of other metals in solution and other carriers. The experimental results confirmed that Cyphos IL102 is a good carrier for chromium(VI) transport and, thus, its removal from aqueous streams, and it also performed well in the presence of accompanying metals and against the performance of other commercially available carriers.
六价铬是一种众所周知的有害元素，因此，去除水中的六价铬是人们普遍关注的问题。在用于去除这类有毒元素的技术中，液膜技术的重要性日益增加，离子液体的使用也是如此，由于其性质，离子液体被认为是绿色溶剂。因此，本工作结合了前三点，提出了一项关于使用商业上可获得的 Cyphos IL102 离子液体作为载体的液膜操作去除六价铬的实验研究。实验变量包括：向进料和接收溶液施加的搅拌速度（获得最大传输的关键参数）、酸、六价铬、氢氧化钠和 Cyphos IL102 在其各种相中的浓度。此外，还评估了本系统在溶液中存在其他金属和其他载体时的性能。实验结果证实，Cyphos IL102 是一种很好的六价铬传输载体，因此可以从水溶液中去除六价铬，并且在存在伴随金属和其他商业上可获得的载体时也能很好地发挥作用。
