Abstract
The Fe–In2S3 nanoparticles were synthesized by an improved reflux method and characterized with kinds of analytical and spectral techniques to confirm their compositional surface morphology, crystal structure, optical and photocatalytic properties. Compared with pure In2S3, Fe-doped In2S3 displayed higher photocatalytic performance in the degradation of p-nitrophenol (PNP) under visible light. The photocatalytic degradation effect came to the best when the molar mass ratio of In:Fe was 95:5 (the degradation efficiency of PNP was 98.86% within 100 min under illumination conditions) and its reaction rate was about 25 times that of pure In2S3. Meanwhile, the mechanism of enhanced photocatalytic activity by doping photocatalysts was explored. The enhanced photocatalytic activity of Fe–In2S3 was attributed to the absorption edge red-shift, the narrowing of the bandgap, and the photolysis behavior of iron complexes. Finally, possible active species and mechanisms were discussed in detail according to the above experimental results.
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