Abstract
Pure and rare earth elements (La, Yb)-doped BiFeO3 microcrystallites were synthesized by a typical hydrothermal process. The crystal structure, morphologies and photocatalytic activities of these microcrystallites were investigated. The results and analysis revealed that substitution of La and Yb not only changed the energy band gap of BiFeO3 system, but also affected the morphologies and dimensions of BiFeO3 microcrystallites. Despite much smaller particle size compared with pure BiFeO3, the Yb-doped BiFeO3 microcrystallites exhibited lower photocatalytic efficiency due to much larger energy band gap, which suggests the energy band configuration intensely influences the photocatalytic activity rather than the particle size.
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