预润湿对 Janus 陶瓷膜制备及布气性能的影响

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.