Mesoporous ZrO2/SBA-15 materials were prepared for the first time by a one-step method using ZrO2 as zirconium source and their uranium (U(VI)) adsorption behavior were studied. The influence of ZrO2 content on the structure, morphology and hydrothermal stability of the obtained ZrO2/SBA-15 was investigated. It was found that the structural order of ZrO2/SBA-15 decreased with increasing ZrO2 content. The hydrothermal stability of SBA-15 was improved by loading of ZrO2. Furthermore, the effects of pH, initial U(VI) concentration, contact time, temperature and ZrO2 content on the U(VI) adsorption capacity were studied. The results demonstrated that the U(VI) adsorption capacity decreased with increasing ZrO2 content and temperature. The adsorption process was found to be well fitted to the Langmuir and pseudo-second-order model. The calculated maximum adsorption capacities were 326 and 294 mg·g−1 for 0.4ZrO2/SBA-15 and 0.8ZrO2/SBA-15 samples at 283 K, respectively. Furthermore, the analysis of thermodynamic parameters (ΔG, ΔH, and ΔS) revealed that the process of U(VI) adsorption onto ZrO2/SBA-15 was feasible, spontaneous and exothermic.

中文翻译：

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一种方便的一步合成介孔 ZrO2/SBA-15 及其铀吸附性能

首次以ZrO2为锆源，采用一步法制备介孔ZrO2/SBA-15材料，并研究了其对铀(U(VI))的吸附行为。研究了ZrO2含量对所得ZrO2/SBA-15的结构、形貌和水热稳定性的影响。发现ZrO2/SBA-15的结构顺序随着ZrO2含量的增加而降低。SBA-15 的水热稳定性通过加载 ZrO2 得到改善。此外，还研究了 pH、初始 U(VI) 浓度、接触时间、温度和 ZrO2 含量对 U(VI) 吸附容量的影响。结果表明，U(VI)吸附容量随着ZrO2含量和温度的增加而降低。发现吸附过程非常适合 Langmuir 和伪二阶模型。0.4ZrO2/SBA-15 和 0.8ZrO2/SBA-15 样品在 283 K 下的计算最大吸附容量分别为 326 和 294 mg·g-1。此外，热力学参数（ΔG、ΔH 和 ΔS）的分析表明 U(VI) 吸附到 ZrO2/SBA-15 上的过程是可行的、自发的和放热的。