关键词: 离子液体负载的TEMPO电催化剂, 聚合物支持电解质, 可回收的三元复合材料

Abstract:

To effectively recover redox catalyst and supporting electrolyte, a novel ternary composite consisting of ionic liquid-supported TEMPO, polymeric ionic-liquid and carbon black was prepared. The ionic-liquid supported redox catalyst TEMPO-IL-BF₄ was firstly synthesized from 4-hydroxy-2,2,6,6-tetramethylpiperidine-N-oxyl, and followed by the reaction of polydimethyldiallylammonium chloride (PDDA) and bis(trifluoromethane)sulfonimide lithium salt (LiTFSI) to form poly[diallyldimethylammonium bis(trifluoromethanesulfonyl)imide] (PDDA(Tf₂N)). A combination of the above mentioned two synthesized materials and carbon black afforded to obtain the ternary composite, which was used as the recoverable supporting electrolyte and mediator for the electrochemical oxidation of alcohol. The results indicate that various alcohols could be oxidized efficiently to the corresponding aldehydes or ketones with the more than 80% yields in the presence of the ternary composite under electrochemical conditions. In addition, the composite could be recovered with 95% recovery after being used for 4 times in experiments. The development of the ternary composite provides an efficient and sustainable approach for the recovery of supporting electrolyte and redox catalyst.

Key words: ionic liquid-supported TEMPO as redox catalyst, polymeric ionic liquid, recoverable ternary composite