Selective preparation of Bi2O3 visible light-driven photocatalyst by dispersant and calcination

topurea-Bi2O3,theabsorptionofa-Bi2O3forultravioletlightwasstrongerthanN-dopedb-Bi2O3synthesizedbycalcinationat300°C,butinvisibleregion,N-dopedb-Bi2O3hadstrongerabsorp-tionthana-Bi2O3.Accordingtoextrapolationprinciple,theabsorp-tionedgesoftheas-preparedBi2O3locatedat535nm,533nmand443nmfortemperatureof350°C,300°Cand400°C,respectively.

seenwhenthecalcinationtemperaturewas350°C,thephotolumi-nescenceintensitywasthelowestamongallthephotocatalysts.Whenthetemperaturewasjust300°C,theintensitywasthehighest.Andtheintensityfellinbetweenwhenthecalcinationtemperatureincreasedto400°C.Therefore,electron–holepairsintheN-dopedb-Bi2O3fabricatedat350°Cshowedthemosteffec-tiveseparation.