Effect of the amount of pore-forming agent starch on the properties of alumina-based ceramic membrane support

Abstract

In order to explore the pore-forming mechanism of starch and the effect of its added amount on the performance of the support, α-Al2O3 was used as raw material, starch was used as pore former, and the single-tube ceramic membrane support was prepared by extrusion molding method. Through X-ray diffraction (XRD), scanning electron microscope (SEM), mass loss method, three-point bending method, the physical and chemical properties of the flexural strength, porosity, acid-base corrosion rate, crystal phase composition, pure water flux and the microscopic morphology were characterized and analyzed respectively. The research results show that the more starch is added, the smaller the flexural strength becomes, and the greater the pure water flux is. The optimum addition amount of starch is 8%. Under these conditions, the average pore throat radius of the support was 1.552 μm, the porosity was 32%, and the pure water flux was 5 003 (L/m2·h·MPa), the flexural strength was 37.88 MPa, and the acid(base) mass corrosion was 0.64%(0.41%).

Keywords

• alumina
• extrusion method
• single tube support
• pore former of starch
• pure water flux