高级氧化清洗对PES膜老化的影响研究

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关键词：膜老化；芬顿体系；活化过硫酸盐体系；聚醚砜（PES）中图分类号：TQ051 文献标识码：A 文章编号：1008-9500（2025）10-0022-07DOI： 10.3969/j.issn.1008-9500.2025.10.007

Abstract： Membrane cleaning is a critical step in membrane technology.Although advanced oxidation processes are widelyused for organic fouling removal，the impact of the generatedfreeradicals onthe structureand performance of organic membranematerials stillrequires in-depth research.Basedonthis，asystematic evaluation is conductedtossess theaging effectsof advancedoxidation techniques （Fentonsystem，activated persulfate system）andtraditionalchemical cleaning agents （NaClO）onPolyether Sulfone （PES）ultrafiltration membranes.Throughanalysis of separation performance， physicochemical characteristics，and functional group structures， it was found that the hydroxyl radical （ ⋅⋅ OH） generated by theFentonsystem caused minimal damage to the PES membrane structure.After96h treatment，the porosityincreasedonly to 35.00% ，and the flux ratio did not exceed2，indicating that itsoxidative effct was selective and localized.The sulfate radical produced by the activated persulfate system exhibited stronger oxidation capacity，leading to a porosity increase of 37.29% and a flux ratio reaching 7.34.In contrast， NaClO demonstrated the most significant non-selective oxidative effect，with aporosity increase of 76.6% and a flux ratio as high as 7.61. Infrared spectroscopy revealed a notable reduction in the intensityof sulfone and aromatic structural peaks，along withthe emergenceof carbonyl peaks，indicating drastic changes on the membrane surface accompanied by molecular chain reorganization.Scanning Electron Microscope （SEM）and contact angle analysis further confirmed that NaClO treatment accelerated the leaching of hydrophilic agent Polyvinyl Pyrolidone （PVP）and pore enlargement，resulting in enhanced membrane hydrophobicity.Mechanistic studies demonstrated thatthe typeoffree radical andoxidation mode are keyfactors influencing membrane aging.These findings provide a theoretical basis for optimizing oxidative cleaning processes and balancing membrane service life.

KeyWords： membrane aging; Fenton system; activated persulfate system; Polyether Sulfone （PES）

目前，膜分离技术已广泛应用于水处理领域，但在使用过程中膜不可避免地受到污染。（剩余7746字）