Synthesis of M (M=Co2+, Co2+/Ni2+)-doped FeS2 Nanospheres with Enhanced Visible-light-induced Photocatalytic Activity
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Nano-spherical Co2+-doped FeS2 was synthesized through a simple solvothermal method. The products were investigated using XRD, FE-SEM, BET, ICP, EDS, TEM, HRTEM, XPS, and UV-vis spectroscopy. The results indicated that Co2+ ion could change the particle nucleation process and inhibited the particle growth of FeS2. In addition, when the content of doped Co2+ was 15%, the degradation efficiency of methylene blue (MB) achieved 60.72% after 210 min irradiation, which increased by 52.01% than that of the undoped FeS2. Moreover, comparison experiments also demonstrated that the M (M=Co2+, Co2+/Ni2+)-doped FeS2 photocatalytic activity efficiency sequence was Co2+ > Ni2+>Co2+/Ni2+. This is ascribed to the fact that the Co2+ doping could induce the absorption edge shifting into the visible-light region and increased the surface area of the samples. The effect mechanisms of M-doping on the band gap and the photocatalytic activity of FeS2 were also discussed.
Key wordsFeS2 solvothermal method doping photocatalytic methylene blue
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