Particulate　matter　(PM)　pollution　has　posed　a　severe　threat　to　the　environment　and　human　health.　Especially　for　submicron-level　fine　particulate　PM0.3,　it　is　still　difficult　to　achieve　high-efficiency　filtration.　Herein,　we　loaded　TiO2/g-C3N4　(TCN)　heterojunction　photocatalyst　on　polystyrene/polyacrylonitrile　(PS/PAN)　multiscale　nanofiber　membranes　by　a　simple　one-step　blending　electrospinning　technique.　Due　to　the　strong　long-range　electrostatic　force　of　the　built-in　electric　field,　the　composite　membrane　has　a　remarkably　enhanced　filtration　effect　under　light.　Even　under　harsh　conditions　with　a　high　PM0.3　concentration　of　more　than　1,800,000　m−3　and　a　high　flow　rate　of　25　L/min,　it　still　has　a　high　filtration　efficiency　of　greater　than　98.5%,　an　increase　of　about　20%　compared　with　dark　conditions,　and　the　pressure　drop　is　only　low　to　94　Pa.　More　importantly,　the　electrostatic　field　can　be　regenerated　with　light,　and　this　preparation　strategy　can　be　effectively　extended　to　other　photocatalyst　heterojunctions.　©　2023　Elsevier　B.V.