氧化铋光催化剂(5)

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

ticlesizewasinclinedtobecomelargerwithincreaseofsinteringtemperature.

Fig.11showsUV–Visdiffusere ectionspectraofBi2O3sinteredatdifferenttemperature.Whenthetemperaturewas350°C,theobtainedsampleshowedthestrongestabsorptionnomatterinultravioletregionorinvisibleregionamongallthesamples.Whenthetemperaturewasjust300°C,thephotocatalyst’sabsorptionforlightwassmallerthanthatcalcinatedat350°C.Therefore,itcanbeconcludedthatwithcalcinationtemperatureraisingandBi5O7NO3graduallytransformingtob-Bi2O3,theabsorptionabilityofN-dopedb-Bi2O3forvisiblelightalsoincreased.Butifthetemper-atureraisedto400°C,whenN-dopedb-Bi2O3completelychanged

Table2

Particlesize,absorptionedge,bandgapenergyanddegradationrateofthesamplesobtainedbydifferentdosageofPEG1000.

ParticlesizeAbsorptionBandgapDegradationWidth(nm)Length(nm)edge(nm)energy(eV)rate(%)1g214–333428–7624392.9194.062g190–285476–6674432.8995.453g

214–323

666–1048

439

2.91

92.07