Ceramic membranes with different pore sizes modified by silane and their oil-water separation performance
Hydrophobic ceramic membranes with low surface energy are often used for containing-water oil separation,and the improvement of flux is the key to improve the economy of membrane separation process.In this study,hydrophobic ceramic membranes were prepared through organosilane modification.The impact of silane modification on the structure and oil-water separation performance of ceramic membranes with various pore sizes of 1 000 nm,100 nm,and 10 nm was investigated.We examined the changes in membrane surface micromorphology,wettability,and permeability resistance before and after modification for each pore size category.Additionally,we evaluated the stability of modified membranes in organic solvents,acid,and alkali.Subsequently,we assessed membrane performance in separating water-in-oil emulsions with varying water contents.The results show that the silane modification significantly increased the membrane permeability resistance for smaller pore sizes.Employing a low transmembrane pressure operation mode combined with high crossflow contributed to enhanced flux for modified membranes.Regarding W/O emulsion,when water content was 1 000 μL/L,all three modified membranes achieved a water rejection exceeding 93％,while maintaining a permeate side water content below 70 μL/L.Among them,the 1 μm modified membrane exhibited the highest flux at 375 L/(m2·h).However,when the volume fraction of water reached 10％,severe contamination occurred on the surface of the 1 000 nm modified membrane resulting in significant drop in flux to only 14.1 L/(m2·h).Conversely,the 100 nm modified membrane showed less contamination and higher flux.
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