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songlaoda银虫 (初入文坛)
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修改摘要2009年11月20日
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| The cellulose ionic liquids of 1-butyl-3-methylimidazolium chloride [BMIM]Cl and 1-allyl-3-methylimidazolium chloride [AMIM]Cl were prepared by one-step method respectively, which were characterized by FTIR. They were then used to treat cotton cellulose in order to improve the enzymatic hydrolysis. The results showed that the reducing sugar concentration of regenerated cotton cellulose treated with [BMIM]Cl and [AMIM]Cl was improved, being only 18.14gL-1 for untreated one. In contrast, dissolving capacity of [AMIM]Cl was better than [BMIM]Cl at the same temperature condition with the reducing sugar concentration being 41.99gL-1 and 41.47gL-1 at their optimal temperature 180℃ and 170℃ respectively. At 180℃, maximum solubility of cotton cellulose in [BMIM]Cl and [AMIM]Cl was both 19%. SEM images revealed that the surfaces of regenerated cellulose treated by ionic liquids have become rough and dense regular structure of the original was spoiled. There was serious corrosion in many areas on the surface of regenerated cellulose. XRD measurements showed that the crystalline size of regeneration cotton cellulose was significantly reduced, which indicating that crystallinity of cellulose was decreased because of ionic liquids being conducive to further digestion. |
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sirljz(金币+3,VIP+0):谢谢交流 11-22 17:25
| The cellulose ionic liquids of 1-butyl-3-methylimidazolium chloride [BMIM]Cl and 1-allyl-3-methylimidazolium chloride [AMIM]Cl were prepared by one-step method, respectively, and they were characterized by FTIR. They were used to treat cotton cellulose in order to improve the enzymatic hydrolysis. The results showed that the reducing sugar concentration of regenerated cotton cellulose treated with [BMIM]Cl and [AMIM]Cl was both improved, being only 18.14 gL-1 for untreated one (没有给出treated之后是多少，这个18.14的意义何在？). In contrast, dissolving capacity of [AMIM]Cl was better than [BMIM]Cl under the same temperature conditions with the reducing sugar concentration being 41.99 gL-1 and 41.47 gL-1 at their optimal temperature 180℃ and 170℃ ,respectively. At 180℃, maximum solubility of cotton cellulose in [BMIM]Cl and [AMIM]Cl was both 19%. SEM images revealed that the surfaces of regenerated cellulose treated by ionic liquids have become rough and dense regular structure of the original was spoiled. Serious corrosion was abserved in many areas on the surface of regenerated cellulose. XRD measurements showed that the crystalline size of regenerated cotton cellulose was significantly reduced, indicating that crystallinity of cellulose was decreased because ionic liquids was conducive to further digestion. |
2楼2009-11-22 16:57:11