XueBingchao,FanZhihao,ZengHaoxin,et al.Influencing Factors and Performance Optimization of Polydopamine Biomimetic Repair of PVDF Damaged Membrane[J].China Water & Wastewater,2026,42(17):34-40.
Influencing Factors and Performance Optimization of Polydopamine Biomimetic Repair of PVDF Damaged Membrane
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第42卷
Number:
第17期
Page:
34-40
Column:
Date of publication:
2026-09-01
- Keywords:
- PVDF ultrafiltration membrane; membrane damage; biomimetic repair; polydopamine; reagent concentration; pH
- Abstract:
- For aged/damaged PVDF ultrafiltration membranes, the influence mechanism of key parameters such as reaction time, reagent concentration and pH value on the physicochemical properties and separation performance of membrane materials in the process of biomimetic repair of polydopamine (PDA) was systematically explored. The results showed that PDA could significantly repair the filtration performance of the damaged membrane. Under the conditions of reaction time of 7 h and reagent concentration of 2 g/L, the damaged membrane reached the optimal value in pure water flux, anti-fouling ability and pollutant rejection rate. However， exceeding the optimal repair conditions could lead to excessive repair, which would thicken the PDA deposition layer on the membrane surface, increase the filtration resistance, and then reduce the flux. At the same time, the improvement of membrane selectivity and flux stability was limited. Regarding the influence of pH value, acidic and strongly alkaline conditions were not conducive to the self polymerization of PDA on the membrane surface, making it difficult to repair damaged membranes. Under weakly alkaline conditions (pH 8.5-9), the repair effect was the best, the hydrophilicity was the strongest, and the improvement effect on the permeability, retention rate, and anti-fouling ability of the damaged membrane was better. The research results provide theoretical support for the repair, regeneration and recycling of PVDF damaged membrane.
Last Update:
2026-09-01