Preparation of g-C3N4/BiVO4 heterojunction and its application in environmental treatment
g-C3N4/BiVO4 heterojunction was successfully prepared through loading method.The structure and properties of as-synthesized samples were analyzed using XRD,SEM,BET,UV-Vis DRS,Mott Schottky,SPV and other techniques.Its photocatalytic activity was evaluated by photocatalytic degradation of RhB and photocatalytic reduction of CO2.The experiment results showed that the energy band structures of g-C3N4 and BiVO4 conform to"Z"type heterojunction,and can effectively improve the separation efficiency of photogenerated carriers,at the same time,the strong reducibility of g-C3N4 conduction band electrons and the strong oxidation of BiVO4 valence band holes are preserved,these characteristic ultimately improve its photocatalytic activity,the sample with 3％g-C3N4 loading amount exhibits the most excellent photocatalytic activity.In the experiment of photocatalytic degradation of RhB,the degradation rate reaches 95.3％after 180 minutes of illumination and the reaction rate constant reaches 0.0166min-1;In the experiment of photocatalytic reduction of CO2,the yields of CO and O2 reached 70.2μmol·g-1 and 45.6µmol·g-1 after 4 hours of illumination,which are significantly higher than that of pure g-C3N4 and BiVO4.
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