UiO-66-AO的制备及其对铀的吸附

通过氮杂-迈克尔加成和胺肟化反应制备出UiO-66-AO材料，利用傅里叶变换红外光谱（FTIR）、X射线光电能谱（XPS）、X射线衍射（XRD）等手段对材料微观性质进行表征研究。深入考察了溶液的pH值、U(Ⅵ)初始浓度和温度等环境因素对吸附性能的影响。结果表明：UiO-66-AO材料对U(Ⅵ)的吸附在pH=5、4 h就达到平衡，吸附过程符合准二级动力学模型；在pH=5、55 ℃时，吸附容量可达到244 mg/g，吸附过程符合Langmuir等温吸附模型；该吸附是一个自发、吸热反应过程。此外，UiO-66-AO在众多其它金属离子存在情况下对U(Ⅵ)也具有优异的吸附效率。

Preparation of UiO-66-AO and Its Adsorption for Uranium

UiO-66-AO material was prepared by Aza-Michael addition and amidoxime reaction, and was well characterized by Fourier transform infrared spectroscopy(FTIR), X-ray photoelectron spectroscopy(XPS), and X-ray diffractometer(XRD). To evaluate the selective adsorption capacity of UiO-66-AO for U(Ⅵ) from radioactive wastewater, the adsorption experiment of U(Ⅵ) on UiO-66-AO was studied by batch adsorption technique. The effect of environmental conditions, such as solution pH, initial U(Ⅵ) concentration, and temperature were studied in detail. The experimental results show that the adsorption process reaches equilibrium in 4 h at pH=5, and follows the pseudo-second-order kinetic model. The maximum adsorption capacity of UiO-66-AO for U(Ⅵ) can reach to 244 mg/g at 55 ℃ and pH=5, and it can be well described by Langmuir isotherm adsorption model. In addition, UiO-66-AO has excellent adsorption efficiency for U(Ⅵ) in the presence of many other metal ions.