In this work, a modified biomass material was successfully prepared by immobilization and inactivation method based on Aspergillus niger , and the obtained environmentally friendly Alginate-immobilized Aspergillus niger microsphere (AAM) exhibited a superior Th(IV) biosorption performance. The sorption kinetics and thermodynamic analysis were studied and showed that the sorption process is spontaneous and endothermic under the experimental conditions. Additionally, the maximum biosorption capacity of AAMs for Th(IV) can be of 303.95 mg g −1 at 313.15 K, which exhibited a superior biosorption capacity than the most reported other biomass materials. The results illustrated the biomaterial had good recyclability through immobilization and inactivation.
Yinghao Zhuang,Shuai Sun,Kai Jia,Lei Shi,Xiangshan Yang
Thorium is a promising nuclear fuel; however, even a small amount in nuclear wastewater can cause significant radioactive pollution. Therefore, it is urgent to develop effective adsorbents for the efficient removal of thorium to solve this problem. Herein, the phytic acid modification of carboxylated Zirconium-based metal-organic framework materials (UiO-66-COOH-PA) has been obtained by rapid high-temperature carbonization, which exhibits excellent performance in removing thorium (IV) in acidic aqueous solutions. The maximum adsorption capacity of UiO-66-COOH-PA-2 (with 40% mass ratio of phytic acid) in solution reaches 315.5 mg/g at a pH of 4, which is more than twice that of the unmodified Zr-based metal organic framework (MOF) material. The adsorption kinetics of UiO-66-COOH-PA on thorium has been analyzed using two different isothermal adsorption models, the Langmuir and Freundlich isotherm adsorption models. It turns out that the Freundlich model is more suitable for the data. The thorium adsorption process reaches dynamic equilibrium very quickly, while the adsorption dynamics of UiO-66-COOH-PA on thorium follows the pseudo-second-order adsorption kinetic model. The excellent adsorption performance of UiO-66-COOH-PA-2 at low pH values indicates that adsorption material containing phosphorus is suitable for the removal of thorium especially in acidic systems. It also exhibits excellent selectivity (up to 90.2%) for Th(IV) adsorption in the presence of several coexisting rare-earth ions. Overall, the integration of phosphorus-modified in Zr-MOFs represents a significant advancement in thorium adsorption technology, offering a pathway toward more effective management of radioactive acidic waste liquid.
Sitong Chen,Tao Bo,Yu Zhang,Yingcai Wang,Xiaoyan Li,Shuang Zhang,Yuhui Liu
The selective removal of thorium (Th) from rare earth element (REE)-associated mineral leachates is essential for improving REE utilization and mitigating radioactive hazards. However, high concentrations of competing metal ions and the lack of environmentally friendly separation strategies make Th(IV) recovery challenging. Here, we report a biomimetic phosphatization approach using nano zero-valent iron (ZVI bm ) and phosphoric acid to construct phosphate-coordinated surfaces for selective Th immobilization. Density functional theory (DFT) calculations reveal that H 3 PO 4 -induced surface reconstruction strengthens Th(IV) adsorption by 82.7 % (energy change from −8.004 to −14.617 eV). Batch experiments using acidic leachates containing 48.8 mg/L Th(IV) demonstrate over 98.8 % recovery efficiency at a low dosage of 0.3 g/L, reaching 99.7 % within 3.0 h. This study provides a green and effective strategy for actinide separation via surface coordination and mineralization chemistry, offering promise for radioactive waste remediation and resource recovery.
危险品化学品经营许可证（带存储）