Adsorption Isotherms, Kinetics, and Desorption of 1,2-Dichloroethane on Chromium-Based Metal Organic Framework MIL-101

Abstract

Adsorption equilibrium and kinetics of 1,2-dichloroethane on a chromium-based metal-organic framework MIL-101 were studied. Desorption activation energies of 1,2-dichloroethane on the MIL-101 were measured using temperature program desorption (TPD) experiments. Results showed that the adsorption capacity of the MIL-101 for 1,2-dichloroethane is 19 mmol/g at 288 K, being much higher than those of some activated carbon, zeolite, and MWCNTs. The isotherms of 1,2-dichloroethane were well fitted by the Langmuir equation. The isosteric heat and diffusion coefficients of 1,2-dichloroethane adsorption on the MIL-101 were separately within the range of 42.0–61.6 kJ/mol and range of 0.854–2.246 × 10⁻¹⁰ cm²/s. TPD spectra exhibited two types of adsorption sites on the MIL-101 with desorption activation energy of 48.6 and 87.6 kJ/mol separately. Multiple recycle runs of 1,2-dichloroethane adsorption-desorption at 298 K (10 mbar for adsorption and 0.05 mbar for desorption) showed the 1,2-dichloroethane adsorption on the MIL-101 is highly reversible, and desorption efficiency is up to 98.42%.

Keywords:

• 1,2-dichloroethane adsorption isotherm
• desorption activation energy
• diffusion coefficients
• isosteric heat of adsorption
• metal-organic frameworks MIL-101

ACKNOWLEDGEMENTS

This work was supported by the National Natural Science Foundation of China (No. 20936001), the State Key Lab of Subtropical Building Science, South China University of Technology (Grant C710090Z), Pulp & Paper Engineering State Key Laboratory, and the National Science Fund for Distinguished Young Scholars of China (No. 21225616) for financial support.