Zhang Shichang, Huang Qunying, Chen Lifeng, Zhong Yilai, Hu Fengtao, Wu Kun, Yin Xiangbiao, Hamza Mohammed F, Wei Yuezhou, Ning Shunyan
Institute of Nuclear Energy Safety Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, PR China; University of Science and Technology of China, Hefei 230026, PR China.
Institute of Nuclear Energy Safety Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, PR China; University of Science and Technology of China, Hefei 230026, PR China.
J Hazard Mater. 2024 Apr 5;467:133741. doi: 10.1016/j.jhazmat.2024.133741. Epub 2024 Feb 7.
Radioactive strontium (Sr) is considered as one of the most dangerous radionuclides due to its high biochemical toxicity. For the efficient and selective separation of Sr from acidic environments, a novel functional adsorbent CEPA@SBA-15-APTES was prepared in this work through the phosphorylation of amino-modified mesoporous silica with organic content of approximately 20 wt%. CEPA@SBA-15-APTES was characterized by TEM, SEM, EDS, TG-DSC, BET, FTIR, and XPS techniques, revealing its characteristics of an ordered hexagonal lattice-like structure and rich functional groups. The experimental results demonstrated that the adsorbent exhibited good adsorption capacity for Sr over a wide acidity range (i.e., from 10 M to 4 M HNO). The adsorption equilibriums of Sr by CEPA@SBA-15-APTES in 10 M and 3 M HNO solutions were reached within 30 and 5 min, respectively, and the adsorption capacities at 318 K were 112.6 and 71.8 mg/g, respectively. Furthermore, by combining the experimental and characterization results, we found that the adsorption mechanism consisted of ion exchange between Sr(II) and H (in P-OH) in the 10 M HNO solution and coordination between the Sr(II) and oxygen-containing (CO and P = O) functional groups in the 3 M HNO solution.
放射性锶（Sr）因其高生化毒性被视为最危险的放射性核素之一。为了从酸性环境中高效、选择性地分离锶，本研究通过对有机含量约为20 wt%的氨基改性介孔二氧化硅进行磷酸化，制备了一种新型功能吸附剂CEPA@SBA-15-APTES。采用透射电子显微镜（TEM）、扫描电子显微镜（SEM）、能谱仪（EDS）、热重-差示扫描量热仪（TG-DSC）、比表面积分析仪（BET）、傅里叶变换红外光谱仪（FTIR）和X射线光电子能谱仪（XPS）技术对CEPA@SBA-15-APTES进行了表征，揭示了其具有有序六方晶格状结构和丰富官能团的特性。实验结果表明，该吸附剂在较宽的酸度范围内（即从10 M到4 M HNO₃）对Sr表现出良好的吸附容量。CEPA@SBA-15-APTES在10 M和3 M HNO₃溶液中对Sr的吸附平衡分别在30分钟和5分钟内达到，318 K时的吸附容量分别为112.6和71.8 mg/g。此外，结合实验和表征结果，我们发现吸附机理在10 M HNO₃溶液中由Sr(II)与P-OH中的H⁺进行离子交换组成，在3 M HNO₃溶液中由Sr(II)与含氧化合物（C=O和P=O）官能团进行配位组成。
