Abstract

The recovery of thorium from acidic chloride medium with amine grafted cellulose resins was studied. Mesoporous polymers were modified with ethylenediamine (R1) and diethylenetriamine (R2) after grafting with glycidyl methacrylate. The sorbents obtained were characterized by Fourier transform IR spectroscopy, thermogravimetric analysis, scanning electron microscopy, and surface area measurements. Modified cellulose resins showed high capacity with relative fast kinetics in batch sorption of Th(IV) ions from chloride aqueous solutions. The maximum uptake capacity for Th(IV) ions on R1 and R2 was found to be 80 and 94.6 mg g^–1 at pH 3.0 at 25°C within 45 min. The adsorption reaction followed the pseudo-second-order model. The data were fitted well by Langmuir isotherm. The mean adsorption energy calculated using DR isotherm showed that the adsorption followed the chemisorption mechanism. The process was exothermic. The performance of the sorbents in the recovery of Th(IV) ions from a standard rock sample and a granite sample from Gattar area, Egypt, was studied. Desorption was performed using different acids. The maximum Th(IV) desorption, 95 ± 2.8%, was reached with 1 M HNO₃.

中文翻译：

---

使用改性纤维素吸附剂从氯化物溶液中提取 Th(IV) 离子

摘要

研究了用胺接枝纤维素树脂从酸性氯化物介质中回收钍。接枝甲基丙烯酸缩水甘油酯后，介孔聚合物用乙二胺（R1）和二亚乙基三胺（R2）改性。获得的吸附剂通过傅里叶变换红外光谱、热重分析、扫描电子显微镜和表面积测量进行表征。改性纤维素树脂在从氯化物水溶液中批量吸附 Th(IV) 离子时表现出高容量和相对较快的动力学。发现 R1 和 R2 上 Th(IV) 离子的最大吸收能力为 80 和 94.6 mg g ^–1在 25°C 下，在 45 分钟内达到 pH 3.0。吸附反应遵循拟二级模型。数据通过朗缪尔等温线拟合良好。使用 DR 等温线计算的平均吸附能表明吸附遵循化学吸附机制。该过程是放热的。研究了吸附剂从标准岩石样品和埃及加塔尔地区的花岗岩样品中回收 Th(IV) 离子的性能。使用不同的酸进行解吸。使用 1 M HNO ₃达到最大 Th(IV) 解吸率，95 ± 2.8% 。