Surface modification method of mullite whisker porous ceramic

By synergistic modification of mullite whisker porous ceramics with silane coupling agents and dopamine, the problems of low separation efficiency and difficulty in utilizing secondary aluminum ash of mullite ceramic membranes were solved, achieving efficient oil-water separation and resource utilization, and improving the hydrophilicity and oleophobicity of ceramic membranes.

CN120815460APending Publication Date: 2025-10-21NORTHEASTERN UNIV CHINA
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Patent Information

Application Number
CN202510853918.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-24
Publication Date
2025-10-21

AI Technical Summary

Technical Problem

Existing mullite ceramic membranes exhibit low separation efficiency when processing oil-water mixtures with high viscosity and high impurity content, and the secondary aluminum ash is not effectively utilized, leading to environmental pollution and resource waste.

Method used

Mullite whisker porous ceramics were modified by silane coupling agent KH550 and dopamine. A silane coupling agent-PDA composite coating was formed on the surface of the ceramic membrane through a low-temperature in-situ coupling-polymerization mechanism, which improved the hydrophilicity and underwater oleophobicity of the ceramic membrane.

Benefits of technology

It improves the oil rejection rate and separation efficiency of ceramic membranes, realizes high-value-added resource utilization of secondary aluminum ash, reduces production costs, and enhances the membrane's anti-fouling and durability.

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Abstract

The invention discloses a surface modification method of mullite whisker porous ceramic, which comprises the following steps: preparing a mullite whisker porous ceramic matrix by using secondary aluminum ash as a raw material, and carrying out synergistic surface modification by using a silane coupling agent KH550 and dopamine; through reasonable utilization of components such as aluminum oxide in the secondary aluminum ash, resource utilization of solid wastes is realized, the production cost is reduced, and through regulation and control of growth of mullite whiskers and a microstructure of porous ceramic, the filtering performance of the material is improved; meanwhile, the hydrophilic-hydrophobic property and the surface energy of the surface of the ceramic membrane can be effectively optimized through surface modification treatment, the separation efficiency of the ceramic membrane in the water-oil suspension filtering process is further improved, and an efficient, environment-friendly and economical new technical path is provided for oil-containing wastewater treatment.
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