大孔膦酸树脂吸附钬的研究

Sorption of Holmium(Ⅲ) on Macroporous Phosphonic Acid Resin

大孔膦酸树脂 (MPAR)对 Ho( )的吸附在 p H=4.5 9时最佳 ,静态饱和吸附容量 2 44 .8mg/ g(树脂 ) ,测得 2 98K时表观吸附速率常数 k2 98=5 .45× 10 - 5s- 1 ,吸附热力学参数△ H=18.6 k J· mol- 1 ,△ S=190 .6 J· mol·K- 1 ,△ G=- 38.2 k J· mol- 1 ,等温吸附遵循 Freundlich曲线 。

Ho(Ⅲ)was quantitatively adsorbed with macroporous phosphonic resin(MPAR) in a medium of pH=4.59. The statically saturated sorption capacity is 244.8 mg Ho(Ⅲ)/g resin.The sorption rate constant determined at 298K is K 298 =5.45×10 -5 s -1 .The thermodynamic parameters of MPAR sorption for Ho(Ⅲ)are △H=18.6kJ·mol -1 ,△S=190.6J·mol·K -1 ,△G=-38.2kJ·mol -1 .The sorption behavior of MPAR for Ho(Ⅲ) obeys the Freundlich isotherm.The sorption mechanism has been discussed by using chemical method and infrared spectrometry.