光催化法与生物法结合降解咪唑类离子液体
Degradation of imidazolium-based ionic liquids with a combination of photocatalysis and biodegradation
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摘要: 采用纳米TiO2光催化与生物降解相结合的方法，考察了3种1，3-二烷基咪唑类氯型离子液体的降解过程，并用 HPLC-MS方法鉴定了光催化降解的碎片和可能的结构。结果表明，在相同条件下，3种离子液体光催化降解的速率次序为1-丁基-3-甲基咪唑氯盐(BmimCl)＞1-己基-3-甲基咪唑氯盐(HmimCl)≈1-辛基-3-甲基咪唑氯盐(OmimCl)。BmimCl的光催化降解曲线符合一级动力学方程，最佳催化剂用量为0.5 g/L。HPLC-MS分析表明，光催化降解是咪唑开环氧化的过程，生成众多部分氧化碎片。离子液体水溶液的光催化预处理有利于提高其后续的活性污泥生物降解性能。
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关键词:
- 离子液体光催化氧化生物降解降解产物
Abstract: The degradability of three kinds of 1，3-dialkylimidazolium-based ionic liquids (ILs) was studied using TiO2 photocatalysis and biodegradation methods. The fragments formed in the photocatalysis were identified using HPLC-MS and their possible structures were proposed. The results indicate that the degradation rate of the ILs follows the order of 1-butyl-3-methylimidazolium chloride (BmimCl)＞1-hexyl-3-methylimidazolium chloride (HmimCl) ≈1-Octyl-3-methylimidazolium chloride (OmimCl). The degradation process of BmimCl could be reasonably represented by first-order reaction kinetics， and the optimal loading of TiO2 is 0.5 g/L. It is showed from the HPLC-MS analysis， photocatalysis is associated with cleavage of the imidazolium ring and oxidation， forming different intermediate fragments with various degree of oxidation. As a result， the pretreatment of IL solution via photocatalysis can improve the biodegradability by activated sludge microorganisms.-
Key words:
- ionic liquids
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