Preparation of Fe0.02/Agx-ZnO composites and their photocatalytic properties
Fe0.02/Agx-ZnO composites with different doping amounts were prepared by hydro-thermal synthesis and calcination methods,and the photocatalytic degradation activity of each catalyst for RhB was investigated.The mechanism analysis showed that:Fe doping into ZnO,Fe3+can form a trap to capture e-.leading to the formation of an Fe doped energy level be-low the conduction band of ZnO,which prompted the shortening of the bandgap of ZnO and the expansion of the spectral response range;Ag doping contributed to the part of the elec-trons(e)leaping to Ag singlet,which reduced the forbidden bandwidth,lowered the energy required for the electron leaps,and the composite of e-h was inhibited.The new Fermi en-ergy levels of the Fe0.02/Agx-ZnO samples are lower than the conduction band energy levels of Fe-ZnO and ZnO,leading to charge separation at their interfaces.The photocatalytic deg-radation performance and recycling performance of Fe0.02/Agx-ZnO composites for the dye Rhodamine B(Rhodamine B,RhB)were further investigated,and the results showed that Fe0.02/Agx-ZnO composites can be used as a stable,efficient and recyclable photocatalyst ma-terial and for wastewater treatment,which expands the application of Fe0.02/Agx-ZnO com-posites.
electron jumpfermi energy levelno-bandwidthphotocatalysis
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