2×4矫治技术（two by four arch）由美国Thomas F·Mulligan提出,因其临床操作利用＂细丝＂、＂轻力＂且效果良好而受到正畸医师的喜爱[1]。前牙反颌是我国儿童常见的一种错颌畸形,它对患者的口腔功能、颜面美观和心理健康均...2×4矫治技术（two by four arch）由美国Thomas F·Mulligan提出,因其临床操作利用＂细丝＂、＂轻力＂且效果良好而受到正畸医师的喜爱[1]。前牙反颌是我国儿童常见的一种错颌畸形,它对患者的口腔功能、颜面美观和心理健康均有较严重的影响[2]。展开更多
Cr(Ⅵ) was quantitatively adsorbed by D201×4 resin with pH=2.63～3.66 in the medium of HAc NaAc.The statically saturated sorption capacity is 156.8mg/g·resin.The sorption rate constant is k 298 =1.80×10...Cr(Ⅵ) was quantitatively adsorbed by D201×4 resin with pH=2.63～3.66 in the medium of HAc NaAc.The statically saturated sorption capacity is 156.8mg/g·resin.The sorption rate constant is k 298 =1.80×10 -4 s -1 .The apparent sorption activation energy of APAR for Cr(Ⅵ) is 7.21kJ·mol -1 .The themodynamic parameters of sorption:enthalpy change ΔH,free energy change ΔG and entropy change ΔS of sorption (D201×4) for Cr(Ⅵ) are 33.12kJ·mol -1 ,-28.36kJ·mol -1 ,206.3J·mol -1 ·K -1 ,respectively.Coordination molar ratio of the functional group of D201×4 to Cr(Ⅵ) is 1∶1.Cr(Ⅵ) adsorbed on D201×4 can be reductively eluated by 5% NH 4Cl-10% NH 3·H 2O.The sorption rate of D201×4 for Cr(Ⅵ) is fast.The equilibrium time of adsorption is five hours.展开更多
文摘Cr(Ⅵ) was quantitatively adsorbed by D201×4 resin with pH=2.63～3.66 in the medium of HAc NaAc.The statically saturated sorption capacity is 156.8mg/g·resin.The sorption rate constant is k 298 =1.80×10 -4 s -1 .The apparent sorption activation energy of APAR for Cr(Ⅵ) is 7.21kJ·mol -1 .The themodynamic parameters of sorption:enthalpy change ΔH,free energy change ΔG and entropy change ΔS of sorption (D201×4) for Cr(Ⅵ) are 33.12kJ·mol -1 ,-28.36kJ·mol -1 ,206.3J·mol -1 ·K -1 ,respectively.Coordination molar ratio of the functional group of D201×4 to Cr(Ⅵ) is 1∶1.Cr(Ⅵ) adsorbed on D201×4 can be reductively eluated by 5% NH 4Cl-10% NH 3·H 2O.The sorption rate of D201×4 for Cr(Ⅵ) is fast.The equilibrium time of adsorption is five hours.
