In the present work, we report the studies concerning liquid-liquid-solid equilibria for the ternary system sodium thiosulphate （Na2S203）＋t-butanol＋water at ambient pressure and at room temperature （303±2 K...In the present work, we report the studies concerning liquid-liquid-solid equilibria for the ternary system sodium thiosulphate （Na2S203）＋t-butanol＋water at ambient pressure and at room temperature （303±2 K）. The solubility data of Na2S203 are reported for solutions in water, t-butanol and solutions of varying concentrations of t-butanol in water. The phase diagram for the said system is developed, described and compared with similar systems studied such as Na2S2O3＋ethanol＋water, K2CO3＋methanol＋water, etc. These results have been explained in terms of structural properties of aqueous t-butanol solutions and further discussed in terms of the effect of ions to cause phase separation.展开更多
The research on the properties of graphene oxide（GO） in various media has become one of the hottest topics since GO is now the main raw material for graphene-based advanced materials. In this work, the g-ray radiati...The research on the properties of graphene oxide（GO） in various media has become one of the hottest topics since GO is now the main raw material for graphene-based advanced materials. In this work, the g-ray radiation chemistry effect of GO nanosheets and their self-aggregation behavior in t-butanol/water medium were investigated. The results show that GO nanosheets are reduced and hydroxyalkylated simultaneously by the alcohol free radicals produced by the radiolysis of t-butanol/water solution under g-ray radiation. The radiation-modified GO nanosheets will self-assemble into a self-standing graphene hydrogel when the p H of the solution is lower than 2. A hydroxyl-functionalized free-standing graphene aerogel is further obtained simply by freeze-drying. This work provides not only a general self-assembly mechanism of GO nanosheets in strong acidic alcohol/water media under high energy radiation, but also a facile and economical preparation method for hydroxyalkylated graphene-based aerogel.展开更多
Bifunctional carbonylation catalysts were prepared by introducing both of acidic and metallic sites into zeolites, such as β, M and Y, by which tertiary butyl acid was synthesized under mild reaction conditions. The ...Bifunctional carbonylation catalysts were prepared by introducing both of acidic and metallic sites into zeolites, such as β, M and Y, by which tertiary butyl acid was synthesized under mild reaction conditions. The effects of reaction temperature and the copper amount as well as the acid strength on the catalytic activity were investigated. The results show that when the content of cuprous for β, M and Y are 2 35%, 2 48% and 7 13% respectively, the carbonylation activity of the related sample is the greatest. In the reaction temperature range, lower temperature is favorable for yielding acid and higher temperature is favorable for yielding ester. The catalytic activity increases with the increase of the acid strength. The in situ FT IR study shows that Cu(Ⅰ) is the metallic active site.展开更多
文摘In the present work, we report the studies concerning liquid-liquid-solid equilibria for the ternary system sodium thiosulphate （Na2S203）＋t-butanol＋water at ambient pressure and at room temperature （303±2 K）. The solubility data of Na2S203 are reported for solutions in water, t-butanol and solutions of varying concentrations of t-butanol in water. The phase diagram for the said system is developed, described and compared with similar systems studied such as Na2S2O3＋ethanol＋water, K2CO3＋methanol＋water, etc. These results have been explained in terms of structural properties of aqueous t-butanol solutions and further discussed in terms of the effect of ions to cause phase separation.
基金supported by the National Natural Science Foundation of China (Nos. 51573175, 51473152, 51773189)Foshan Scientific and Technological Innovation Team Project (No. 2013IT100041)+1 种基金Foshan University-City Cooperation Project (Scientific and Technological Innovation Project, No. 2014HK100291)the Fundamental Research Funds for the Central Universities (Nos. WK2060200012, WK3450000001)
文摘The research on the properties of graphene oxide（GO） in various media has become one of the hottest topics since GO is now the main raw material for graphene-based advanced materials. In this work, the g-ray radiation chemistry effect of GO nanosheets and their self-aggregation behavior in t-butanol/water medium were investigated. The results show that GO nanosheets are reduced and hydroxyalkylated simultaneously by the alcohol free radicals produced by the radiolysis of t-butanol/water solution under g-ray radiation. The radiation-modified GO nanosheets will self-assemble into a self-standing graphene hydrogel when the p H of the solution is lower than 2. A hydroxyl-functionalized free-standing graphene aerogel is further obtained simply by freeze-drying. This work provides not only a general self-assembly mechanism of GO nanosheets in strong acidic alcohol/water media under high energy radiation, but also a facile and economical preparation method for hydroxyalkylated graphene-based aerogel.
文摘Bifunctional carbonylation catalysts were prepared by introducing both of acidic and metallic sites into zeolites, such as β, M and Y, by which tertiary butyl acid was synthesized under mild reaction conditions. The effects of reaction temperature and the copper amount as well as the acid strength on the catalytic activity were investigated. The results show that when the content of cuprous for β, M and Y are 2 35%, 2 48% and 7 13% respectively, the carbonylation activity of the related sample is the greatest. In the reaction temperature range, lower temperature is favorable for yielding acid and higher temperature is favorable for yielding ester. The catalytic activity increases with the increase of the acid strength. The in situ FT IR study shows that Cu(Ⅰ) is the metallic active site.
