摘要
氨基膦酸树脂 ( APAR)对镱 ( )的吸附在 p H=5 .1时最佳。静态饱和吸附容量为 2 75 mg/g千树脂 ;用 3.0～ 4.0 mol· L- 1HCl能还原洗脱。测得吸附速率常数k2 98=9.5 7× 1 0 - 6 s- 1,等温吸附服从 Freundlich经验式 ,吸附热力学函数△ H0 =1 7.6k J· mol- 1。吸附机理表明 ,APAR功能基上的 N、O与 Yb3+发生配位键合 ,配位摩尔比为 2∶
Yb(Ⅲ) is quantitatively adsorbed by amino phosphonic acid resin (APAR) in the medium of pH=5.1. The statically saturated sorption capacity is 275 mg/g resin . Yb(Ⅲ) adsorbed on APAR can be reductively eluted by 3.0～4.0 mol·L -1 HCl. The sorption rate constant is k 298 = 9.57×10 -6 s -1 . The sorption behavior of APAR for Yb(Ⅲ) obeys the Freundlich isotherm. The enthalpy change △H O of sorption is 17.6 kJ·mol -1 . Coordination molar ratio of the functional group of APAR to Yb(Ⅲ) is 2∶1. The sorption mechanism shows that the nitrogen and oxygen atoms of the functional group of APAR coordinate with Yb(Ⅲ) to form coordination bond.
出处
《分析科学学报》
CAS
CSCD
北大核心
2001年第5期399-402,共4页
Journal of Analytical Science
基金
浙江省教育厅资助项目 (No.972 1 1 )
丽水市科委计划项目 (No.990 0 8)
