A method for preparing CeO2 ultra-small mesoporous membrane by micro-explosion pulverization

The ultra-small mesoporous CeO2 membrane is prepared on the ceramic membrane by the micro-explosion crushing method, which solves the problem of CeO2 membrane defects on the ceramic membrane, achieves uniform pore size and high retention performance, and is used in chemical, biological, food and other fields.

CN118846822BActive Publication Date: 2025-09-12NANJING TECH UNIV
2 Cites 0 Cited by

Patent Information

Application Number
CN202410752159.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-06-12
Publication Date
2025-09-12
Estimated Expiration
2044-06-12

AI Technical Summary

Technical Problem

It is difficult with existing technology to construct a complete, defect-free CeO2 film layer with uniform pore size on a ceramic membrane base film, especially to avoid film defects caused by crystal transformation during the sintering process.

Method used

The micro-explosion pulverization method is adopted. By filling an appropriate amount of Ce4+ between the CeO2 sol particles, a micro-explosion phenomenon occurs during calcination in an air atmosphere, generating high temperature and high pressure to instantly crush the large sol particles, forming a CeO2 film layer with uniform pore size, limiting the growth of crystal nuclei and repairing film defects.

Benefits of technology

A stable and uniformly pore-sized CeO2 ultrasmall mesoporous membrane was prepared with a molecular weight cutoff of ~5000Da and a pure water flux of ~70L·m-2·h-1·bar-1. When applied to a cellulase-chitosan simulation system, the cellulase retention rate reached 100%.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The present invention relates to the technical field of membrane separation material preparation, and specifically to a method for preparing a CeO2 ultra-small mesoporous membrane with uniform pore size by a micro-explosion pulverization method and its application. 4+ Filled between CeO2 sol particles, when calcined in air atmosphere, a large amount of volatile substances are concentratedly released, and micro-explosion occurs, which instantly generates high temperature and high pressure in the confined space, causing large sol particles to instantly shatter and produce smaller particles. The high energy generated by the micro-explosion promotes Ce 4+ It combines with O2 to form CeO2 particles that fill the large pores. At the same time, the confined space formed by the accumulation of particles can limit the growth of crystal nuclei, effectively controlling the size of the newly generated CeO2, and repairing the film defects caused by the uneven size of CeO2 sol particles, thereby preparing a complete, stable, and uniformly pore-sized ultra-small mesoporous film layer with good repeatability.
Need to check novelty before this filing date? Find Prior Art