Preparation of BiVO4/GO composites and their photocatalytic performance
Bismuth vanadate(BiVO4)has attracted considerable attention in photocatalysis due to its cheap and easy availability,mild and simple preparation conditions,narrow bandgap(～2.4 eV),out-standing photoresponse ability,and excellent stability.A fishbone like bismuth vanadate/graphene(BiVO4/GO)composite photocatalytic material was successfully prepared using bismuth nitrate and am-monium metavanadate as raw materials by hydrothermal method.The structure and morphology of the composite photocatalytic material were characterized by X-ray powder diffraction(XRD),scanning electron microscopy(SEM),and transmission electron microscopy(TEM),and its degradation activity for acyclovir under simulated sunlight was investigated.SEM and TEM show that BiVO4 has a unique fishbone like structure,with GO layers interspersed between them,effectively connecting the BiVO4 nanostructures.The addition of GO has changed the original pure monoclinic scheelite structure of BiVO4.The degradation efficiency of BiVO4/GO(BG-3)for acyclovir(AC)is as high as 97.23％,and the degradation efficiency can still reach 87.15％after 5 cycles,indicating that the catalyst has good cycling activity.The Langmuir-Hinshelwood(L-H)first-order kinetic model equation was used to fit the catalytic degradation process,and the correlation coefficients R2 were all higher than 0.97,indicat-ing that the L-H first-order kinetic model equation is very suitable for fitting the catalytic degradation process.
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