PEG@ZIF-8/PVDF Nanocomposite Membrane for Efficient Pervaporation Desulfurization via a Layer-by-Layer Technology

Abstract

The desulfurization property of conventional mixed matrix membranes (MMMs) cannot meet the necessary demand due to particles aggregation and interface defects. Here, we put forward a layer-by-layer (LBL) approach to make a novel PEG@ZIF-8/poly­(vinylidene difluoride)­(PVDF) composite membrane for pervaporation desulfurization. In this way, a ZIF-8 layer is covered on the surface of the PVDF porous membrane via an in situ growth method. Then, a PEG layer is covered on the ZIF-8 layer by a casting method. Compared with pristine PEG membranes, the separation performance of the ZIF-8@PEG/PVDF nanocomposite membrane increased significantly. This can be attributed to the homogeneous ZIF-8 particle layer and better compatibility between the poly­(ethylene glycol) (PEG) matrix and ZIF-8 particles. The membrane achieves a maximum total flux of 3.08 kg·m–2·h–1 at the third in situ growth cycles of ZIF-8 particles and a maximum sulfur enrichment factor of 7.6 at the sixth in situ growth cycles of ZIF-8 particles.

Ordered Honeycomb‐Pattern Membrane†

“…[ 128 ] Poly(ethylene glycol) (PEG) itself has super inhibition ability to resist non‐specific protein adsorption and cell adhesion. [ 36,129‐134 ] The introduction of PEG as the chain sequence of the side chain or block copolymer can effectively improve the solubility of polyimide in solvents such as chloroform, the stability of water droplets and the ability to prevent the adhesion of microorganisms and bacteria. [ 135,136 ] Chang et al .…”

Removal of sulfur‐containing compounds from Fluid Catalytic Cracking unit (FCC) gasoline by pervaporation process: Effects of variations in feed characteristics and mass transfer properties of the membrane

“…Several sulfur selective membranes have already been developed and analyzed to desulfurize FCC gasoline 10–40 . The effects of operating conditions have also been investigated, and they are optimized for better membrane performance 10–13,19,20,22,25,27,36–40 .…”

“…Several sulfur selective membranes have already been developed and analyzed to desulfurize FCC gasoline 10–40 . The effects of operating conditions have also been investigated, and they are optimized for better membrane performance 10–13,19,20,22,25,27,36–40 . In some other studies, the effects of different hydrocarbon compounds with different functional groups, molecular weight, and sulfur containing species are analyzed 10–13,19,21,27,36,38 .…”

“…The effects of operating conditions have also been investigated, and they are optimized for better membrane performance 10–13,19,20,22,25,27,36–40 . In some other studies, the effects of different hydrocarbon compounds with different functional groups, molecular weight, and sulfur containing species are analyzed 10–13,19,21,27,36,38 . Experimental results and mathematical model predictions on the spiral wound and tubular modules are also reported in some studies 35–39 …”

“…Most of the earlier reported studies were performed on model gasoline of binary or ternary systems containing one sulfur containing species and another hydrocarbon compound 10–13,19,21,27,35–39 . In these studies, experimental results of different binary or ternary model systems were compared to analyze the effects of different hydrocarbons or sulfur‐containing compounds present in gasoline.…”