Effect of pre-wetting on preparation and gas distribution performance of Janus ceramic membrane
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.
membranemicrobubblesceramic membranewettabilityaerationmass transfer
万方数据
维普
