Catalysis　is　the　most　efficient　and　economical　method　for　treating　volatile　organic　pollutants　(VOCs).　Among　the　many　materials　that　are　used　in　engineering,　platinized　carbon　nitride　(Pt/g-C3N4)　is　an　efficient　and　multifunctional　catalyst　which　has　strong　light　absorption　and　mass　transfer　capabilities,　which　enable　it　to　be　used　in　photocatalysis,　thermal　catalysis　and　photothermal　synergistic　catalysis　for　the　degradation　of　benzene.　In　this　work,　Pt/g-C3N4　was　prepared　by　four　precursors　for　the　photothermal　synergistic　catalytic　degradation　of　benzene,　which　show　different　activities,　and　many　tests　were　carried　out　to　explore　the　possible　reasons　for　the　discrepancy.　Among　them,　the　Pt/g-C3N4　prepared　from　dicyanamide　showed　the　highest　activity　and　could　convert　benzene　(300　ppm,　20　mL.min　(-1))　completely　at　162　degrees　C　under　solar　light　and　173　degrees　C　under　visible　light.　The　reaction　temperature　was　reduced　by　nearly　half　compared　to　the　traditional　thermal　catalytic　degradation　of　benzene　at　about　300　degrees　C.