State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, School of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China
A series of activated carbon-based hybrid membranes (AC-Pebax/PSF) were fabricated via a physical blending method,using a polysulfone (PSF) ultrafiltration membrane as the support and incorporating activated carbon (AC) and polyether block amide (Pebax) as functional fillers.Pervaporation experiments were performed using a model gasoline composed of a thiophene/n-octane mixture to systematically investigate the effects of AC loading,feed temperature,and thiophene concentration on the desulfurization performance.The crystal structure,chemical composition,surface morphology,and swelling resistance of the hybrid membranes were characterized by X-ray diffraction (XRD),Fourier transform infrared spectroscopy (FTIR),tungsten filament scanning electron microscopy (SEM),and swelling tests.The hybrid membranes were further modified with potassium hydroxide (KOH) to optimize their structure and separation performance.The results indicate that the optimal desulfurization efficiency was achieved at an AC loading of 2 wt%,a feed temperature of 40℃,and a thiophene concentration of 14.535×10-3 mol·L-1,yielding a permeation flux of 7.38 kg·m-2·h-1 and an enrichment factor of 4.58.KOH modification significantly enhanced both the permeation flux and enrichment factor,improved the anti-swelling property,reduced membrane crystallinity,and promoted the selective transport and enrichment of thiophene from n-octane.This study provides a feasible strategy for developing high-performance pervaporation membranes for gasoline desulfurization.
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