Taking urea,Bi(NO3)3·5H2O and Na2WO4·2H2O as the main raw materials,g-C3N4 is prepared through the thermal polycondensation method and used in preparing Bi2WO6/g-C3N4 composite photocatalysts through the hydrothermal method.The photocatalytic efficacy of the specimens is evaluated through the degradation of methyl orange under the radiation of simulated sunlight.It is shown that the composite photocatalysts show much higher photocatalytic performance than monomeric photocatalysts.The composite photocatalyst exhibits the best photocatalytic performance when it is prepared under the conditions that the mass ratio of Bi2WO6/g-C3N4 is 2∶1,the hydrothermal temperature is 180℃ and hydrothermal time is 12 h.The degradation of methyl orange reaches 98.15％with 210 min of radiation time over this photocatalyst,representing 25.1％and 37.7％higher than those over Bi2WO6 alone and g-C3N4 alone,respectively.The photocatalytic degradation process accords with the first order kinetic equation.The degradation rate of methyl orange still reaches 95.17％after four repeated experiments over the composite photocatalyst,showing an excellent stability.
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