The　cubic　S/N　co-doped　TiO2　(TNSx,　x　is　the　calcination　temperature)　photocatalysts　with　rich　oxygen　vacancies　were　obtained　by　high　temperature　calcination　of　sulfur　powder　and　titanium-based　MOFs　NH2-MIL-125　for　the　photocatalytic　removal　of　gaseous　formaldehyde　(a　volatile　organic　compound).　Among　the　obtained　catalysts,　the　presence　of　oxygen　vacancies　restricted　photogenerated　electron　and　holes　recombination.　98.00%　removal　of　gaseous　formaldehyde　in　150　min　could　be　achieved　over　TNS600　by　xenon　lamp.　The　removal　efficiency　for　formaldehyde　was　well　retained　for　five　cycle　experiment.　The　results　from　PL,　TRPL　and　EIS　revealed　that　TNS600　had　the　best　separation　efficiency　of　photogenerated　electrons　and　holes,　and　the　enhanced　charge　separation　led　to　a　significant　increase　in　photocatalytic　activity.　The　photocatalytic　oxidation　mechanism　indicated　that　the　•OH　and　•O2−　radicals　were　mainly　involved　in　the　efficient　elimination　of　gaseous　formaldehyde　and　were　able　to　mineralize　formaldehyde　to　H2O　and　CO2.　©　2023