摘要
Adsorption and desorption behavior of Yb （III） by SQD-85 resin was investigated by various chemical methods and IR spectrometry. The adsorption capacity of SQD-85 resin for Yb （III） was studied as a function of solution pH, initial concentration of Yb（III）, temperature and contact time. The optimal pH for the adsorption was 5.50 in the HAc-NaAc system, and the maximum adsorption capacity was estimated to be 347.6 mg/g at 308 K. The isotherms adsorption data fit well with Langmuir model. The adsorption kinetics data are in agreement with pseudo-second-order model. Thermodynamic parameters indicate that Yb （III） adsorption by SQD-85 resin is endothermic and spontaneous in nature. Thomas model is reasonably accurate in predicting experimental column results. The dynamic desorption rate of Yb（III） can increase to 97.3% when the elution agent is 1.0 mol/L HCl. These results suggest that Yb（III） in aqueous solution can be removed and recovered by SQD-85 resin efficiently.
用化学和红外光谱等方法研究SQD-85树脂对镱(III)的吸附和解吸行为,探讨溶液pH、镱(III)初始浓度、温度以及吸附时间对吸附量的影响。结果表明,SQD-85树脂在pH5.5的HAc-NaAc缓冲体系中对镱(III)的吸附效果最佳,测得树脂在308K时的静态饱和吸附量为347.6mg/g;等温吸附符合Langmuir模型;吸附动力学符合假二级动力学模型。热力学参数表明,SQD-85树脂吸附镱(III)是自发的吸热过程。动态实验结果符合Thomas模型。当用1.0mol/LHCl作解吸剂时,解吸率可达97.3%。因此,使用SQD-85树脂可以有效地去除和回收水溶液中的镱(III)。
基金
Project (2011007) supported by Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Ministry of Education, Zhejiang Sci-tech University, China
Project (2010C32085) supported by Science and Technology Department of Zhejiang Province, China
