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.
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