The adsorption isotherms of caffeine from aqueous solution onto three hydrogen donating adsorbents - hydroxypolystyrene. polystyrene-azo-pyrogallol, and D72 resin-were measured. The adsorption enthalpies calculated fr...The adsorption isotherms of caffeine from aqueous solution onto three hydrogen donating adsorbents - hydroxypolystyrene. polystyrene-azo-pyrogallol, and D72 resin-were measured. The adsorption enthalpies calculated from the isotherms according to the Clausius-Clapeyron equation were-24~ -36kJ/mol, -32~ -37kJ/mol. and -19~ -24kJ/mol respectively These values implied that the absorption processes were based on hydrogen bonding. Furthermore, the mechanism of the adsorption of caffeine onto D72 resin was studied by IR spectra and the small molecular model experiments. and the results showed that the adsorption of caffeine onto hydrogen donating adsorbents was based on hydrogen bonding.展开更多
The Dalang Weir(irrigation system) has benefited local people in the Chengdu Plain since its completion in the early Qing Dynasty.After extensive research of historical background details,and channeling scenes of the ...The Dalang Weir(irrigation system) has benefited local people in the Chengdu Plain since its completion in the early Qing Dynasty.After extensive research of historical background details,and channeling scenes of the Weir construction,and sifting through relevant literature in combination with chronicles,chorography,and tablet inscriptions from the Ming and Qing dynasties,assembled evidence indicates that the Weir was built during the autumn of the first reign to the spring of the second reign of Emperor Kangxi.The Weir is an important expansion of the famous Dujiangyan Irrigation System and after analyzing and assessing the value of the project under the principle of "making the past serve the present," it is also proof of a Buddhist Monk’s active participation in a public welfare undertaking.In addition to inheriting the basic logic of Shu’s water culture cultivated by Yu the Great,King Bieling of Shu,and Li Bing during their water control activities,it implies the spirit of joint efforts of officials and the populace to society and posterity.Monk Dalang,the initiator of the project,therefore,deserves great respect from later generations for his outstanding merits and virtues as well as his significant contribution to society.展开更多
基金Supported by the National Natural Science Fsundation of China !(Grant No. 29574164)
文摘The adsorption isotherms of caffeine from aqueous solution onto three hydrogen donating adsorbents - hydroxypolystyrene. polystyrene-azo-pyrogallol, and D72 resin-were measured. The adsorption enthalpies calculated from the isotherms according to the Clausius-Clapeyron equation were-24~ -36kJ/mol, -32~ -37kJ/mol. and -19~ -24kJ/mol respectively These values implied that the absorption processes were based on hydrogen bonding. Furthermore, the mechanism of the adsorption of caffeine onto D72 resin was studied by IR spectra and the small molecular model experiments. and the results showed that the adsorption of caffeine onto hydrogen donating adsorbents was based on hydrogen bonding.
文摘The Dalang Weir(irrigation system) has benefited local people in the Chengdu Plain since its completion in the early Qing Dynasty.After extensive research of historical background details,and channeling scenes of the Weir construction,and sifting through relevant literature in combination with chronicles,chorography,and tablet inscriptions from the Ming and Qing dynasties,assembled evidence indicates that the Weir was built during the autumn of the first reign to the spring of the second reign of Emperor Kangxi.The Weir is an important expansion of the famous Dujiangyan Irrigation System and after analyzing and assessing the value of the project under the principle of "making the past serve the present," it is also proof of a Buddhist Monk’s active participation in a public welfare undertaking.In addition to inheriting the basic logic of Shu’s water culture cultivated by Yu the Great,King Bieling of Shu,and Li Bing during their water control activities,it implies the spirit of joint efforts of officials and the populace to society and posterity.Monk Dalang,the initiator of the project,therefore,deserves great respect from later generations for his outstanding merits and virtues as well as his significant contribution to society.