金属有机骨架材料ZIF⁃67对甲基橙的吸附性能

Adsorption Properties of Methyl Orange by Metal Organic Framework ZIF⁃67

李明艳 崔爽 刘宁宁

Mingyan Li Shuang Cui Ningning Liu

辽宁石油化工大学 石油化工学院，辽宁 抚顺 113001

School of Petrochemical Engineering，Liaoning Petrochemical University，Fushun Liaoning 113001，China

采用溶剂热法合成了金属有机骨架材料ZIF?67，并通过扫描电子显微镜（SEM）、X?射线粉末衍射（XRD）、傅里叶红外光谱（FT?IR）以及热重（TG）对其进行表征。将合成的ZIF?67用于水中甲基橙的吸附，系统地研究了pH、吸附剂质量、甲基橙初始质量浓度、接触时间和温度对吸附性能的影响。结果表明，当ZIF?67质量为20 mg、pH为7时，吸附效果最好；在303 K下吸附25 min达到平衡；在303 K下，ZIF?67对甲基橙的理论最大吸附量为152.67 mg/g。等温吸附数据符合Langmuir等温吸附模型，吸附动力学符合准二级吸附动力学模型，该吸附过程是一个自发的放热过程。乙醇可以对吸附后的ZIF?67较好地脱附，经过6次吸附?脱附循环仍保持较好的吸附效果。

Metal organic framework ZIF?67 has been successfully fabricated via solvothermal method. The as?synthesized ZIF?67 was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, X?ray powder diffraction and thermogravimetric analysis. The adsorption property of ZIF?67 for methyl orange was investigated. The effects of pH value, dosage of adsorbent, initial concentration of methyl orange solution, contact time and temperature were discussed. The results show that the most proper dosage of ZIF?67 is 20 mg. When the pH value of the dye solution is 7, the adsorption capacity is the best. At 303 K, the adsorption reached an equilibrium within 25 min. The maximum adsorption capacity of ZIF?67 for methyl orange is 152.67 mg/g at 303 K. The isotherm data followed the Langmuir isotherm model and the kinetic adsorption obeyed the pseudo?second?order model. Thermodynamic parameters illustrated that the adsorption process is spontaneous and endothermic. The spent ZIF?67 has excellent regenerative performance by treating with ethanol, and the adsorption ability of ZIF?67 remains good after six adsorption?desorption cycles.

国家自然科学基金项目(41773093)

10.3969/j.issn.1672-6952.2021.04.006