Abstract: Different Ni-doped BFO nanoparticles (BiFe1-xNixO3, x=0.00, 0.02, 0.04, 0.06, 0.08) were prepared by double solvent sol-gel method.The results of X ray diffraction showed that the BFNO powder sample prepared by sol-gel method was R3C rhombohedra structure. The scanning electron microscope showed that the grain size of BFNO powder decreased with the increase of Ni doping amount. The photoelectron spectroscopy analysis showed that Ni in BFNO had two valence states of Ni3+ and Ni2+. As the capture site of photo induced electrons and holes, Ni ions can effectively improve the separation rate of photo generated carriers and reduce the recombination rate. The analysis of UV-Vis absorption spectrum shows that the band gap is decreased and Ni doping also caused red-shift of the UV-Vis absorption spectra. The results of magnetic measurement show that the ferromagnetism of BFNO increases with the increase of Ni doping. The photocatalytic activity of BFNO nano powder was analyzed by photocatalytic degradation of Congo red solution by BFNO nano powder under visible light. With the increase of Ni doping amount, the photocatalytic activity of BFNO is significantly enhanced, and the sample with 8% Ni doping had the strongest catalytic performance. The results show that the enhancement of photocatalytic activity of BFNO can be attributed to the decrease of electron hole pair recombination efficiency caused by Ni doping.
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2020, Vol. 34 
