研究报告

  • 许成,张炜,陈元涛,王雲生.UiO-66/UiO-66-PYDC的制备及其对UO22+吸附性研究[J].环境科学学报,2018,38(11):4350-4359

  • UiO-66/UiO-66-PYDC的制备及其对UO22+吸附性研究
  • Preparation of UiO-66/UiO-66-PYDC and their absorptive properties on uranyl ions
  • 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)
  • 作者
  • 单位
  • 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、CO32-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 CO32- 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.

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