Ag^+-exchanged resins are prepared and studied for ethylene/ethaneseparation by adsorption. On Ag^+-exchanged S9, at 25 deg. C and0.1013 Mpa, the equilibrium adsorbed amount for C_2H_4 is 0.992 mmol·g^-1, and The...Ag^+-exchanged resins are prepared and studied for ethylene/ethaneseparation by adsorption. On Ag^+-exchanged S9, at 25 deg. C and0.1013 Mpa, the equilibrium adsorbed amount for C_2H_4 is 0.992 mmol·g^-1, and The adsorption ratio for C_2H_4/C_2H_6 is 3.56. Theadsorption capacity can be restored almost completely at 25 deg. CAnd 75 deg. C, and the desorption residual amount is less than 0.01mmol·g^-1. For the adsorption consisting of physical Adsorption andπ-complexation with energy heterogeneity, the equilibrium data arecorrelated with Langmuir- Freundlich isotherm equation.展开更多
Several 1,4-benzenedicarbonyl thiourea resins （BTR） were synthesized through interfacial polymerization between 1,4- benzenedicarbonyl diisothiocyanate and polyamine. Their structures were confirmed by FT-IR. The ad...Several 1,4-benzenedicarbonyl thiourea resins （BTR） were synthesized through interfacial polymerization between 1,4- benzenedicarbonyl diisothiocyanate and polyamine. Their structures were confirmed by FT-IR. The adsorption properties （including the effect of adsorption time, pH, initial concentrations and temperature） of BTR-1, BTR-2 and BTR-3 for Ag（I） were investigated by batch tests. The results show that the adsorption equilibria of BTR-1, BTR-2, BTR-3 for Ag（I） are achieved after about 10 h. Their equilibrium adsorption capacities are 7.11, 6.75 and 6.23, respectively, and the adsorption process accords with G. E. Boyd equation and Langmuir adsorption isotherm as well. The adsorption capacities increase with the increase ofpH （the highest uptake values are observed at pH being about 6-7）. The thermodynamic parameters of BTR-1 were calculated. The results show that ΔH^ and ΔS^ are 6 958.8 J/mol and 64.28 J/（mol.K）, respectively, and ΔG^ at 20, 30, 40 and 50 ℃ are -11.79, -12.52, -13.16 and -13.8 kJ/mol, respectively. The silver-loaded resins can be quantitatively eluted by a solution containing 6% thiourea in 1 mol/L HNO3.展开更多
基金Supported by the Scientific Reserch Foundation for Returned Overseas Chinese Scholars, Ministry of Education, P. R. China.
文摘Ag^+-exchanged resins are prepared and studied for ethylene/ethaneseparation by adsorption. On Ag^+-exchanged S9, at 25 deg. C and0.1013 Mpa, the equilibrium adsorbed amount for C_2H_4 is 0.992 mmol·g^-1, and The adsorption ratio for C_2H_4/C_2H_6 is 3.56. Theadsorption capacity can be restored almost completely at 25 deg. CAnd 75 deg. C, and the desorption residual amount is less than 0.01mmol·g^-1. For the adsorption consisting of physical Adsorption andπ-complexation with energy heterogeneity, the equilibrium data arecorrelated with Langmuir- Freundlich isotherm equation.
基金Projects(20476105, 50604016) supported by the National Natural Science Foundation of China
文摘Several 1,4-benzenedicarbonyl thiourea resins （BTR） were synthesized through interfacial polymerization between 1,4- benzenedicarbonyl diisothiocyanate and polyamine. Their structures were confirmed by FT-IR. The adsorption properties （including the effect of adsorption time, pH, initial concentrations and temperature） of BTR-1, BTR-2 and BTR-3 for Ag（I） were investigated by batch tests. The results show that the adsorption equilibria of BTR-1, BTR-2, BTR-3 for Ag（I） are achieved after about 10 h. Their equilibrium adsorption capacities are 7.11, 6.75 and 6.23, respectively, and the adsorption process accords with G. E. Boyd equation and Langmuir adsorption isotherm as well. The adsorption capacities increase with the increase ofpH （the highest uptake values are observed at pH being about 6-7）. The thermodynamic parameters of BTR-1 were calculated. The results show that ΔH^ and ΔS^ are 6 958.8 J/mol and 64.28 J/（mol.K）, respectively, and ΔG^ at 20, 30, 40 and 50 ℃ are -11.79, -12.52, -13.16 and -13.8 kJ/mol, respectively. The silver-loaded resins can be quantitatively eluted by a solution containing 6% thiourea in 1 mol/L HNO3.
