Abstract
UiO-66-Z with uniform mesopores using 2-aminoterephthalic acid and terephthalic acid as mixed ligands was synthesized by hydrothermal method in this paper. Thermodynamic and dynamic properties of UiO-66-Z were discussed. Dynamic separation performance and adsorption selectivity of UiO-66-Z for the equimolar n-heptane/methylcyclohexane (nHEP/MCH) binary mixture were investigated. Results show that UiO-66-Z has complete tetrahedral cages with uniform mesopores of 38 Å. Adsorption rate constant of MCH on UiO-66-Z (14.5 × 10 −3 S −1 ) is twice that of UiO-66 (6.7 × 10 −3 S −1 ), while nHEP does not significantly change at 323K with the pressure of 0.05–0.1 kPa. Effective adsorption diffusion coefficient of nHEP and MCH on the UiO-66-Z is about 25 times higher than that on the UiO-66. Compared with UiO-66, the desorption activation energy (Ed 1 ) of the first desorption peak of nHEP and MCH on the UiO-66-Z is reduced by 53.75% and 76.66%, respectively. The separation selectivity of MCH to nHEP on the UiO-66-Z reaches up to 3.13 at 473 K. Results indicate that the introduction of mesopores in the UiO-66-Z can enhance mass transfer of nHEP and MCH in the pores, especially which is more obvious mass transfer effect for MCH with a larger molecular dynamics diameter under low partial pressure. The retention of most tetrahedral cages in the UiO-66-Z is conducive to improving its inverse shape separation selectivity for MCH/nHEP. Compared with UiO-66, nHEP and MCH have higher desorption efficiency on UiO-66-Z at the same temperature and time. • Mesoporous UiO-66 was synthesized by dual mixed ligands for enhancing mass transfer performance. • The retention of most tetrahedral cages in the UiO-66-Z is conducive to improve separation selectivity for methylcyclohexane/n-heptane. • Separation selectivity of UiO-66-Z to MCH/nHEP reaches up to 3.13 at 473 K. • MCH and nHEP have higher desorption efficiency on UiO-66-Z at the same temperature and time.
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