[Bmim]PF_6-TBP萃取剂微萃取富集水中苯酚

Microextraction Enrichment of Phenol in Water with [Bmim]PF_6-TBP Extractant

将常规离子液体1-丁基-3-甲基咪唑六氟磷酸盐([Bmim]PF_6)与特定萃取剂磷酸三丁酯(TBP)结合,建立了超声辅助的微萃取富集目标物苯酚的方法,研究了萃取剂种类、用量、p H值、超声水浴温度及离子强度等因素对富集效果的影响,得到微萃取的最佳实验条件,对该方法的富集机理进行了探讨.结果表明,在较少的萃取剂用量(30μL[Bmim]PF6-30μL TBP)、较低的水浴温度(273.15 K)及无盐效应和pH值影响的条件下,富集倍数最佳达128.二元萃取剂对苯酚的高效富集,主要是由于TBP中P==O键与苯酚-OH中的-H缔合,形成配合物.

1-Butyl-3-methyl imidazolium hexafluorophosphate（[Bmim]PF_6） and tributyl phosphate（TBP） were combined as a binary extractant to extract phenol. Influencing variables on the enrichment performance of the binary extractant such as the volumes of [Bmim]PF_6 and TBP, p H, temperature and salt were investigated. The enrichment mechanism was explored. The results showed that a high enrichment factor of 128 was achieved in 30 μL TBP-30 μL [Bmim]PF_6 system at a low temperature of 273.15 K without addition of salt and buffer solution. The high enrichment performance was attributed to the interaction between P==O of TBP and -H of phenol OH.