Hybrid Membranes Fabricated By Incorporating Facilitated Transport Carriers For Pervaporative Desulfurization Process Intensification

Pervaporation,as a new approach for desulfurization of gasoline,has significant advantages such as high efficiency,low pollution,and low energy cost,will show good prospect of application.Fabricating high-performance pervaporation membrane is the key challenge for the large-scale application and cost reduction.Incorporating appropriate facilitated transport carriers is the critical method to optimize regulation of membrane structure and enhance transport properties in membrane,thus acquiring high-performance membrane.This study mainly focused on fabricating facilitated transport membrane with high separation performance for gasoline desulfurization with the strategy of facilitated transport carriers design-transport channels create-chemical structure and topological structure manipulate-process intensification of pervaporation.This study is expected to provide theoretical and technological strategy for membrane fabrication.Main conclusions are summarized as follows:The activity manipulation of facilitated transport carriers.Fe²⁺was selected as the stabilizer because of the standard reduction potential of Fe²⁺is higher than Cu⁺.Cu⁺was selected as the facilitated transport carriers based on efficient facilitated transport capability.Cu⁺and Fe²⁺ions were co-impregnated onto carbon nitride nanosheets via polydopamine chelating,and then incorporated into a Pebax matrix to fabricate the facilitated transport hybrid membranes.The high aspect ratio and ordered alignment of nanosheets optimize the crystalline and free volume property of membrane.The high activity and well stability enhanced the diffuse process of penetrants.When the content of Cu⁺Fe²⁺@CNs was 5 wt%,the membrane achieves the optimum desulfurization performance with a permeation flux of 13.42 kg/?m²h?and an enrichment factor of 7.11.Moreover,the membrane showed superior long-term operation stability.The quantity manipulation of facilitated transport carriers.Covalent organic frameworks,which contain great amount of amino groups,was selected as supporter for silver ions and incorporated into Pebax matrix to fabricate hybrid membrane.48.11wt%of silver ions were impregnated onto covalent organic frameworks via chelating.The weak interaction between filler and polymer made the majority of Ag⁺@COFs floated to the top of the membrane and minority of Ag⁺@COFs were entrapped in Pebax,which enhanced the dissolve and diffuse process.When the content of Ag⁺@COFs was 9 wt%,optimum desulfurization performance with a permeation flux of 16.35 kg/?m²h?and an enrichment factor of 6.80 was achie ved.The continuity manipulation of facilitated transport carriers.Mo S₂ nanosheets was selected as filler and incorporated into Pebax matrix to fabricate hybrid membrane.The basal plane of Mo S₂ nanosheets have strong interaction to thiophene,thus the nanosheets can construct continuous transport channel for thiophene.High separation performance was achieved due to the nanosheets further enhance crystalline and free volume properties of hybrid membrane.When the content of Mo S₂ was 4 wt%,optimum desulfurization performance with a permeation flux of 11.42 kg/?m²h?and an enrichment factor of 9.11 was achieved.