表面活性剂对离子液体预处理纤维素的影响

摘要

The cellulose was coupling-treated with ionic liquid (IL),1-methyl-3-ethyl-imidazole dimethyl phosphate ([MEIM][DMP]),and surfactant. The influence of surfactants on enzymatic hydrolysis was examined,and the mechanism was analyzed by IR and XRD. The results show that the hydrolysis rate of treated-cellulose with [MEIM][DMP]/polyethylene glycol 4000(PEG4000) was 78.2%higher than that of untreated cellulose,and 6.5%higher than that of regenerated cellulose with no surfactant treatment. The IR spectrum showed PEG4000 molecular characteristics peak. The XRD analysis showed that the regenerated cellulose was almost amorphous zone with PEG4000 treatment. Therefore,it can be used to further improve the hydrolysis rate of cellulose treated with PEG4000. And the degree of crystallinity decreased,thereby increasing the rate of hydrolysis.%采用离子液体1-甲基-3乙基咪唑磷酸二甲酯（[MEIM][DMP]）与表面活性剂耦合处理纤维素，考察表面活性剂对于酶解的影响，并用红外光谱、X 射线衍射分析其机理。结果表明[MEIM][DMP]/聚乙二醇4000（PEG4000）处理的纤维素酶解率比未处理的纤维素高78.2%，比未加表面活性剂处理的再生纤维素高6.5%。红外光谱显示有PEG4000分子特征峰出现，X射线衍射分析表明PEG4000处理再生的纤维素几乎为无定形区。因此，PEG4000参与的处理有利于进一步提高纤维素酶解率，使结晶度降低，从而酶解率提高。