离子液体[omim][PF6]的生物降解性研究

Biodegradation of [omim][PF_6]

以[omim][PF6]为C、N、P营养源驯化活性污泥,考察驯化前后不同活性污泥接种微生物时离子液体的生物降解性,以及在支链上添加酯基对离子液体生物降解性的影响;同时,探讨经过驯化的活性污泥对1-甲基-3-辛基咪唑阳离子基团([omim]+)生物降解的途径.结果表明,通过在支链上添加酯基,可以改善离子液体的生物降解性;以普通的活性污泥为接种微生物的密闭瓶实验表明,[omim][PF6]的生物降解率<20%,属于难生物降解的物质,进入环境后可能产生较长时间的积累;以经过驯化的活性污泥为接种微生物时,可以提高[omim][PF6]的生物降解率到60%左右;在[omim]+的生物降解过程中,会产生1-甲基咪唑阳离子的积累;对[omim]+的生物降解产物的HPLC-MS/MS分析,初步推测[omim]+的生物降解途径.

Acclimatized the activated sludge with [ omim] [ PF6] which was used as the C, N, P resources for microbe, the biodegradation ratio of [omim] [PF6] with different inoculants which were acclimatized or not was investigated. And the influence of appending an ester in the side chain of the imidazolium cation on the biodegradation of [omim] [ PF6 ] was discussed in the same conditions. The biodegradation pathways of [ omim]^ ＋ were analyzed. The results showed that the biodegradation of ionic liquids was improved by appending an ester in the side chain ; the biodegradation rate of [ omim] [ PF6 ] was less than 20 % when the inoculant was original activated sludge, which was not referred as ＂readily biodegradable＂; [omim] [PF6 ] would stay in environment for a long time; the biodegradation ratio reached 60% when the inoculant was acclimatized activated sludge; 1-methyl-imidazolium was residual in the course of biodegradation of [ omim]^＋ , the semifinished products of biodegradation of [omim]^＋ was analyzed by HPLC-MS/MS and the pathways were presumed.