【摘要】 研究了亚胺基二乙酸树脂(DAAR)对镧离子的吸附行为及机制,pH=5.73的HAc NaAc体系为最佳吸附条件。静态饱和吸附容量为188mg·g-1·R;表观吸附速率常数k298=2.00×10-5s-1,表观吸附活化能Ea=9.57kJ·mol-1;等温吸附服从Freundlich经验式;吸附热力学函数ΔH=10.2kJ·mol-1;ΔS=45.0J·mol-1·K-1;ΔG298=-3.17kJ·mol-1;用0.5mol·L-1HCl作解吸剂,解吸率接近100%;树脂功能基与镧离子的配位摩尔比为3∶1;化学分析及红外光谱表明树脂功能基上的O与La3+发生配位键合。更多还原

【Abstract】 The adsorption behavior and mechanism of diglycolamidic acid resin(DAAR) for lan thanum were investigated. The optimal adsorption condition of DAAR for La(Ⅲ)is pH 5.73 in HAc-NaAc medium. The statically saturated adsorption capacity is 188 m g·g-1·resin at 298 K. The apparent adsorption rate constant is k  298=2.11×10-5 s-1. The apparent adsorption activation energy of D AAR for La(Ⅲ) is 9.57 kJ·mol-1. The adsorption behavior of DAAR for La( Ⅲ) obeys the Freundlich isotherm. The adsorption parameters of thermodynamics a re ΔH=10.2 kJ·mol-1, ΔS=45.0 J·mol-1·K-1, ΔG 298=-3.17 kJ·mol-1 respectively. HCl can be used as an eluant . The elution percentage is near to 100% when the concentration of HCl reaches 0 .5 mol·L-1. Coordination molar ratio of the functional group of DAAR to L a(Ⅲ) is 3∶1. Chemical method and IR spectrometry show that the oxygen atom of the functional group of DAAR coordinated with La(Ⅲ) to form coordination bond.更多还原