Effects of water content on the dissolution behavior of wool keratin using 1-ethyl-3-methylimidazolium dimethylphosphate  

作　　者：Zhenlei Zhang Xiaochun Zhang Yi Nie Hui Wang Shuangshuang Zheng Suojiang Zhang 

机构地区：[1]Key Laboratory of Green Process and Engineering,Beijing Key Laboratory of lonic Liquids Clean Process,State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China [2]School of Chemistry and Chemical Engineering,University of Chinese Academy of Sciences,Beijing 1000491 China [3]Zhengzhou Institute of Emerging Technology Industries,Zhengzhou 450000,China

出　　处：《Science China Chemistry》2017年第7期934-941,共8页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(21576262);the National Natural Science Fund for Distinguished Young Scholars(21425625);International Cooperation and Exchange of the National Natural Science Foundation of China(51561145020);Key Research Program of Frontier Sciences,CAS(QYZDY-SSW-JSC011);“Recruitment of Outstanding Technologist”of Chinese Academy of Sciences

摘　　要：Ionic liquids(ILs) are eco-friend and recyclable solvents for dissolution of wool keratin, and water is often used as antisolvent to regenerate keratin from IL solution. To recycle the ILs, removing water is the necessary step. However, complete removal of the water is energy-intensive and costly. The water in ionic liquids would change the physicochemical properties and cluster structures of the IL and further affect its dissolution behavior on keratin. Here, 1-ethyl-3-methylimidazolium dimethylphosphate([Emim]DMP) was used for experiments due to its good performance on dissolving keratin. The experimental and simulation results showed that the dissolving capability of [Emim]DMP was decreased and the interactions between cation and anion became weaker with water concentration increasing. Furthermore, the dissolution time of wool keratin in [Emim]DMP increased with water content rising. At the same time, the effect of water in ILs on the secondary structure distribution and thermal stability of regenerated keratin was not obvious. In this work, by taking the structures of [Emim]DMP, keratin dissolution time and properties of the regenerated keratin into consideration, a balanced range of water content in [Emim]DMP was determined, which could not only reduce recycling cost but also not affect the dissolution behavior of the IL.Ionic liquids（ILs） are eco-friend and recyclable solvents for dissolution of wool keratin, and water is often used as antisolvent to regenerate keratin from IL solution. To recycle the ILs, removing water is the necessary step. However, complete removal of the water is energy-intensive and costly. The water in ionic liquids would change the physicochemical properties and cluster structures of the IL and further affect its dissolution behavior on keratin. Here, 1-ethyl-3-methylimidazolium dimethylphosphate（[Emim]DMP） was used for experiments due to its good performance on dissolving keratin. The experimental and simulation results showed that the dissolving capability of [Emim]DMP was decreased and the interactions between cation and anion became weaker with water concentration increasing. Furthermore, the dissolution time of wool keratin in [Emim]DMP increased with water content rising. At the same time, the effect of water in ILs on the secondary structure distribution and thermal stability of regenerated keratin was not obvious. In this work, by taking the structures of [Emim]DMP, keratin dissolution time and properties of the regenerated keratin into consideration, a balanced range of water content in [Emim]DMP was determined, which could not only reduce recycling cost but also not affect the dissolution behavior of the IL.

关 键 词：keratin ionic liquids water recycle 

分 类 号：O645.1[理学—物理化学]