Algal　intracellular　organic　matter　(IOM),　released　during　algae＇s　normal　growth　phase　and　water　treatment　processes,　has　long　been　a　source　of　significant　membrane　fouling,　considerably　limiting　the　effective　use　of　ultrafiltration(UF)　technology.　In　this　study,　a　Bi-doped　TiO2　composite　with　powdered　activated　carbon　(Bi2O3–TiO2/PAC)　was　loaded　on　ceramic　UF　membranes　by　vacuum　filtration,　and　the　prepared　photocatalytic　modified　ceramic　membranes　(MCMs)　were　investigated　for　the　removal　of　IOM　and　the　mitigation　of　membrane　fouling　at　different　loading　levels　and　under　three　operating　conditions:　Dark,　Dark-UV,　and　UV.　The　results　showed　that　the　photocatalytic　MCMs　were　able　to　remove　the　protein　and　humic　acid　fluorescent　components　of　IOM　and　decompose　or　mineralize　organic　matter　with　molecular　weights　of　10–50　kDa.　Under　the　Dark,　Dark-UV,　and　UV　conditions,　the　final　normalized　flux　of　MCM-2.88　was　significantly　increased　by　22.6　%,　82.1　%,　and　108.0　%,　respectively.　The　hydrophilicity　of　MCMs　not　only　transformed　the　interactions　between　IOM　and　the　membrane　into　repulsive　forces,　but　also　the　composite　material　on　the　membrane　surface　transforms　the　membrane　fouling　mechanism　from　intermediate　blocking　model　to　cake　layer　formation.　Furthermore,　the　application　of　photocatalytic　oxidation　under　the　Dark-UV　and　UV　conditions　yielded　a　reduction　in　both　reversible　and　irreversible　fouling.　This　action　led　to　an　increased　hydrophilicity　and　elevated　free　energy　of　adhesion　with　IOM　during　the　filtration　process.　Moreover,　the　main　fouling　mechanism　changed　into　complete　or　intermediate　blocking.　These　outcomes　collectively　underscore　the　capability　of　MCMs　to　alleviate　membrane　fouling　induced　by　IOM.　This　advancement　holds　substantial　promise　for　the　advancement　and　widespread　implementation　of　photocatalytic　ceramic　membrane　filtration　techniques.　©　2023　Elsevier　B.V.