Abstract
Visible light-responsive g-C 3N 4/SiO 2–HNb 3O 8 composite photocatalysts were prepared by a solid state-reaction method with melamine as a g-C 3N 4 precursor. The photocatalytic activities of the samples were evaluated for rhodamine B (RhB) degradation under visible light irradiation and the results were compared with those obtained over pure SiO 2–HNb 3O 8 and g-C 3N 4. Techniques such as XRD, FT-IR, SEM, TEM, and UV–vis diffuse reflectance spectroscopy were adopted to explore the characteristics of samples. The g-C 3N 4/SiO 2–HNb 3O 8 composite materials exhibited superior activities than pure SiO 2–HNb 3O 8 and g-C 3N 4; the sample prepared with SiO 2–HNb 3O 8 to melamine ratio being 1:2 and the heating duration being 4 h performed the best. The improved activity of g-C 3N 4/SiO 2–HNb 3O 8 is attributed to the unique synergetic effect between SiO 2–HNb 3O 8 and g-C 3N 4.
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