Preparation and application of flat-plate ceramic ultrafiltration membrane with high-performance by spray-dip coating method

A flat-plate ceramic ultrafiltration membrane with high permeability is prepared by a spray-dip coating method and one-step sintering. In the preparation process, the intermediate layer is prepared by spraying directly on the support even if the particle size of the powder is less than the pore size of the support. And then, the top separation layer is prepared by dipping the dried intermediate layer into the suspension and one-step co-sintering. The results show that the ceramic ultrafiltration membrane has an average pore size of 50 nm and a pure water flux of 725.74 L/(m(2) h bar). The rejection rate is 98.8% and the stable flux is 180 L/(m(2) h bar) in treating the stable 1,000 mg/L oil-water emulsion, which indicates the high permeability in treating oil-containing wastewater.