一种具有压电响应性的PVDF基中空纤维纳滤膜的制备方法及应用
A one-step method was used to prepare PVDF-based hollow fiber nanofiltration membranes. By introducing piezoelectric carbon-based materials and optimizing the β-crystal form to form an internal electric field, the problem of poor selective separation performance of hollow fiber nanofiltration membranes was solved, achieving efficient separation of multivalent/monovalent ions, and applicable to various membrane configurations.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TIANJIN POLYTECHNIC UNIV
- Filing Date
- 2025-04-04
- Publication Date
- 2026-07-17
AI Technical Summary
Existing hollow fiber nanofiltration membranes have poor selective separation performance in mixed ion separation, making them difficult to commercialize. Traditional preparation methods are complex and costly, making it difficult to achieve efficient separation of multivalent/monovalent ions.
A PVDF-based hollow fiber nanofiltration membrane was prepared using a one-step method. By introducing a carbon-based material with piezoelectric properties through non-solvent phase separation-interface polymerization (NIPS-IP) technology, the β-crystal content of PVDF was optimized, forming a continuous channel and generating an internal electric field within the membrane, thereby enhancing the surface charge density and achieving a triple synergistic effect.
It simplifies the preparation process, improves the pure water flux and divalent cation removal rate of the membrane, reduces the monovalent cation removal rate, solves the problems of poor separation efficiency and industrialization in traditional methods, and is suitable for various membrane configurations.