Release Time:2019-03-11  Hits:

Indexed by: Journal Article

Date of Publication: 2018-06-15

Journal: JOURNAL OF MEMBRANE SCIENCE

Included Journals: EI、SCIE

Volume: 556

Page Number: 54-65

ISSN: 0376-7388

Key Words: Metal-organic framework membrane; UiO-66-NH2 membrane; Pervaporation; Desulfurization

Abstract: Defect-free UiO-66-NH2 membranes with high performance were prepared on the inner side of porous tubular alpha-alumina substrates modified with a thin layer of zirconia and were explored for the deep desulfurization of model gasoline via pervaporation. The deliberate modification of the alpha-Al2O3 substrates with zirconia (ZrO2) sol greatly favors the formation of high-quality UiO-66-NH2 membranes. The effects of different phase states of ZrO2 on the growth of UiO-66-NH2 membranes were discussed. The effects of membrane polarity and pore diameter on the gasoline desulfurization were investigated by comparing the PV results of different UiO-66 series membranes. It has been found that UiO-66-NH2 membranes derived from tetragonal zirconia layer exhibit outstanding performance in pervaporation desulfurization, showing a flux of 2.16 kgm(-2) h(-1) and an enrichment factor of 17.86 along with high reproducibility for n-octane containing 1312 ppm thiophene as model gasoline at 40 degrees C. Besides, the influences of operation temperature and feed concentration on the PV performance of UiO-66-NH2 membranes were also investigated in detail. More importantly, due to the zirconia modification layer acting as strong anchoring sites between the membrane and substrate, UiO-66-NH2 membranes demonstrate excellent stability in model gasoline, thus showing the potential for the application in practical gasoline desulfurization.