Abstract
Silica (SiO2)/polydimethylsiloxane (PDMS)/polyvinylidene fluoride (PVDF) composite membranes were prepared through a dynamic negative pressure method for phenols recovery from coal gasification wastewater (CGW) in pervaporation process. Multiple techniques including scanning electron microscopy (SEM), water contact angle (WCA) and fourier transform adsorption spectrum (FTIR) were used to examine the surface morphology, hydrophobic properties and functional groups of the modified PVDF hollow fiber membranes, respectively. The effects of SiO2 concentration, coating time and coating pressure on pervaporation performance were systematically studied. The operating conditions obtained are as follows: 12wt.% SiO2, coating time 60min, coating pressure 50kPa. Under the optimum conditions, the phenols flux and separation factor were obtained as 6.55gm−2h−1 and 2.59, respectively. Results show that separation factor in pervaporation process based on 12wt.% SiO2 filled PDMS/PVDF composite membranes was about 2.5 times higher than that of the PDMS/PVDF membrane.
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