Li Cong, Xie Chao, Jiang Tianjiao, Chen Lifeng, Ning Shunyan, Luo Caiwu, Zheng Qi, Wang Ji, Wei Yuezhou
School of Nuclear Science and Technology, University of South China, Hengyang 421001, China.
School of Resources Environment and Safety Engineering, University of South China, Hengyang 421001, China.
Toxics. 2024 Feb 27;12(3):181. doi: 10.3390/toxics12030181.
Ruthenium is required to separate from high-level liquid waste (HLLW) because Ru is a valuable resource and is negatively influential on the vitrification process of HLLW. However, the separation of Ru is very challenging due to its complicated complexation properties. In this study, the adsorption and desorption characteristics of ruthenium on a synthesized SiPyR-N3 (weak-base anion exchange resin with pyridine functional groups) composite were investigated in nitric acid and nitrite-nitric acid systems, respectively, and the adsorption mechanism was explored. The experimental results showed that SiPyR-N3 has a significantly better adsorption effect on Ru in the nitrite-nitric acid system than in the nitric acid system, with an increase in the adsorption capacity of approximately three times. The maximum adsorption capacity of Ru is 45.6 mg/g in the nitrite-nitric acid system. The SiPyR-N3 possesses good adsorption selectivity ( is around 100) in 0.1 M NO-0.1 M HNO solution. The adsorption processes of Ru in the two different systems are fitted with the pseudo-second-order kinetic model and Langmuir model for uptake kinetics and adsorption isotherms, respectively. The results obtained from the FT-IR, XPS, and UV absorption spectrometry indicate that NO was involved in the adsorption process either as a complexing species with the metal ions or as free NO from the solution. A 0.1 M HNO + 1 M thiourea mixed solution shows effective desorption performance, and the desorption efficiency can reach 92% at 328 K.
钌需要从高放废液（HLLW）中分离出来，因为钌是一种有价值的资源，并且对高放废液的玻璃固化过程有负面影响。然而，由于钌复杂的络合性质，其分离极具挑战性。在本研究中，分别在硝酸体系和亚硝酸-硝酸体系中研究了钌在合成的SiPyR-N3（含吡啶官能团的弱碱性阴离子交换树脂）复合材料上的吸附和解吸特性，并探讨了吸附机理。实验结果表明，SiPyR-N3在亚硝酸-硝酸体系中对钌的吸附效果明显优于硝酸体系，吸附容量增加了约三倍。在亚硝酸-硝酸体系中钌的最大吸附容量为45.6 mg/g。SiPyR-N3在0.1 M NO-0.1 M HNO溶液中具有良好的吸附选择性（约为100）。钌在两种不同体系中的吸附过程分别用伪二级动力学模型和Langmuir模型拟合吸附动力学和吸附等温线。傅里叶变换红外光谱（FT-IR）、X射线光电子能谱（XPS）和紫外吸收光谱的结果表明，NO作为与金属离子的络合物种或溶液中的游离NO参与了吸附过程。0.1 M HNO + 1 M硫脲混合溶液显示出有效的解吸性能，在328 K下解吸效率可达92%。
