【摘要】 采用静态吸附法研究了Aliquat 336功能化壳聚糖螯合吸附剂对溶液中Y(Ⅲ)的富集分离。溶液的pH值对Y(Ⅲ)的吸附有较大影响,Y(Ⅲ)初始浓度为90 mg/L,温度为20℃,pH=4.9时,Y(Ⅲ)的吸附量达到大;Y(Ⅲ)的吸附符合准二级动力学模型和Langmuir等温吸附模型;随着温度的升高,Y(Ⅲ)的吸附量减少,吸附过程为放热反应过程。XPS结果表明,Y(Ⅲ)的吸附机理为阴阳离子均参与了Y(Ⅲ)的吸附,提高了Y(Ⅲ)的分离选择性和吸附量。以废弃土荧光粉中土为例,讨论了在实际体系中对Y和其它土的富集和分析分离,显示了本方法潜在的应用价值。更多还原

【Abstract】 Aliquat 336 functionalized chelating adsorbent derived from chitosan for enrichment and separation of Y(Ⅲ) were investigated by static adsorption method. The adsorption of Y(Ⅲ) was greatly influenced by the pH of solution, and reached maximum at 20 ℃ using 90 mg/L Y(Ⅲ) at pH 4.9, and the adsorption of Y(Ⅲ) followed a pseudo-second-order kinetics model and the Langmuir isotherm model. The reduction of Y(Ⅲ) adsorption with the increasing of temperature meant that the adsorption process was exothermic. XPS analysis demonstrated that both cations and anions of the adsorbent were involved in adsorption process, thereby resulting in an improved adsorption of Y(Ⅲ). The adsorbent was thus efficient for enrichment and separation of rare earths from waste rare earth phosphor.更多还原