Membrane dispersion is one of the effective methods to prepare microbubbles.In the process of membrane dispersion,the wettability of the membrane surface plays a crucial role in the bubble dispersion process.Herein,Janus ceramic membranes with asymmetric wettability were prepared through asymmetric chemical modification.A pre-wetting treatment was introduced on the hydrophobic modified ceramic membranes before hydrophilic modification.The effects of different pre-wetting agents on the structure,surface properties,and chemical composition of the Janus ceramic membranes,as well as their gas dispersion and mass transfer performance in a CO2-NaOH system were investigated.The results showed that the wettability of the hydrophilic side and the uniformity of the hydrophilic layer of the Janus ceramic membranes prepared after pre-wetting treatment were influenced by the surface tension and water solubility of the pre-wetting agents.The decrease of the surface tension of the pre-wetting agent was conducive to the deposition of a uniform hydrophilic layer on the ceramic membranes,and the enhancement of the surface hydrophilicity of the membranes.Compared to the untreated membranes,the Janus ceramic membranes prepared by ethanol pre-wetting had the smaller average bubble size and narrower size distribution,and the more optimal mass transfer performance.
关键词
膜/微气泡/陶瓷膜/润湿性/曝气/传质
Key words
membrane/microbubbles/ceramic membrane/wettability/aeration/mass transfer
维普
万方数据