Dissolution of cellobiose in the aqueous solutions of chloride salts: Hofmeister series consideration |
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| Authors: | Zhijing Liu Chao Zhang Ruigang Liu Wushou Zhang Hongliang Kang Pingping Li Yong Huang |
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| Institution: | 1.Sate Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory of Molecular Sciences, Institute of Chemistry,Chinese Academy of Sciences,Beijing,China;2.CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry,Chinese Academy of Sciences,Beijing,China;3.National Research Center for Engineering Plastics, Technical Institute of Physics & Chemistry,Chinese Academy of Sciences,Beijing,China;4.University of Chinese Academy of Sciences,Beijing,China |
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| Abstract: | The effects of chloride salts on the dissolution of cellobiose in aqueous solution were investigated using calorimetry and 1H NMR. The dissolution of cellobiose in salt solutions is a typical entropy-driven process. The activity of ZnCl2 and LiCl hydrated ions is enhanced as the hydration number decreases with increasing temperature. Zn2+ and Li+ hydrates can interact with the oxygen atoms at the O5 and O6 positions of cellobiose and associate with the Cl? anions, leading to the breakage of cellobiose hydrogen bonds. We found that the solubility of cellobiose in aqueous solutions is on the order of ZnCl2 > LiCl > NaCl > H2O > KCl > NH4Cl, which is consistent with the Hofmeister series. For the first time, we recognized the specific ionic effects of the Hofmeister series on the dissolution of cellobiose in salt aqueous solutions. This finding is helpful for understanding the dissolving mechanism of cellulose in aqueous solvents with salts and providing fundamental knowledge for finding and designing new cellulose solvents. |
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