• 关键词：金属有机框架材料  吸附  铀酰离子  UiO-66复合材料

• 基金项目：国家自然科学基金（No.21667024）；青海省自然科学基金（No.2016-ZJ-912）

• 许成
• 青海师范大学化学化工学院, 西宁 810008

• 张炜
• 青海师范大学化学化工学院, 西宁 810008

• 陈元涛
• 青海师范大学化学化工学院, 西宁 810008

• 王雲生
• 青海师范大学化学化工学院, 西宁 810008

• 摘要：通过水热法合成了两种锆基有机骨架材料，采用XRD、SEM、IR、TG、EDS、BET等技术对材料的结构和形貌进行了表征，并通过静态吸附实验在不同条件下测试所制材料对UO₂²⁺的吸附性能，考察了时间、温度、初始铀浓度、pH、CO₃^2-对吸附的影响.结果表明：UiO-66体系对铀酰离子的吸附以化学吸附为主，通过表面的羧基官能团与铀酰离子结合从而达到吸附的目的.此外，本实验中材料的比表面积对吸附的影响不明显.在初始最佳pH为10.5的条件下，通过热力学模型拟合发现，低浓度下UiO-66拥有更大的吸附量.随着溶液中初始铀酰离子浓度的升高，UiO-66-PYDC展现出更好的吸附效果.

• Abstract：Various zirconium-based organic-framework materials were synthesized with hydrothermal method. The structure and morphology of materials were analyzed by using XRD,SEM,IR,TG,EDS and BET. The absorption properties of UO₂²⁺ were tested in static absorption experiments. The effects of time, temperature, initial concentration of uranyl ions, pH and CO₃^2- ions on the uranyl ions absorption were studied. The results show that the UiO-66 system absorbs the UO₂²⁺ mainly based on chemisorption, through combining uranyl ions and carboxylate group. Besides, the specific surface area of the material has little effect on adsorption. It can be found that UiO-66 has greater absorption capacity at low concentration by the thermodynamic model under the optimum pH of 10.5. With the increase of uranyl ion concentration, UiO-66-PYDC shows the better absorption performance.

• Key words：metal organic frameworks  adsorption  uranyl ions  UiO-66 composite material

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