Journal of Liaoning Petrochemical University
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Adsorption Properties of Methyl Orange by Metal Organic Framework ZIF⁃67
Mingyan Li, Shuang Cui, Ningning Liu
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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.

2021, 41 (4): 34-40. DOI: 10.3969/j.issn.1672-6952.2021.04.006