Abstract
In2O3/C3N4 composites were prepared with In(OH)3 and C3N4 by ball-milling calcination. The samples were characterized by TG, XRD, TEM, XPS, FT-IR, DRS, EIS, Photocurrent and Photoluminescence measurements. Photocatalytic performance of the catalyst was measured by the degradation test of methyl orange (MO). The photocatalytic performance of In2O3/C3N4 composites is higher than that of In2O3 and C3N4. The photocurrent response to In2O3/C3 N4 (17.3%) was 11.3 times and 183.1 times as high as that of pure In2O3 and C3N4, respectively. The enhanced photocatalytic activity was attributed to the high separation and migration efficiency of photoinduced electrons and holes. Superoxide anion (·O2−) and hole (h+) played important roles in the methyl orange (MO) degradation.
Highlights
The environmental issues and energy shortages have become two important global problems, which have seriously threatened people’s life
In order to improve the photocatalytic activity of In2O3, researchers have used a variety of methods, such as morphology control [6, 7], metal deposition [8], and combining with semiconductors [9,10,11]
The obtained composites showed better performance than individual In2O3 and C3N4. These catalysts were mostly prepared by complicated method in liquid phase [9] and the solid phase synthesis was rarely reported
Summary
The environmental issues and energy shortages have become two important global problems, which have seriously threatened people’s life. Indium oxide (In2O3), a n-type semiconductor material, has a direct band gap of 3.8 eV and an indirect band gap of 2.8 eV [2]. It is an effective sensitizer and its absorption spectrum can extend from ultraviolet region to the visible region. The obtained composites showed better performance than individual In2O3 and C3N4. These catalysts were mostly prepared by complicated method in liquid phase [9] and the solid phase synthesis was rarely reported. The organic pollution (MO) was chosen to examine the photocatalytic activity of In2O3, C3N4 and In2O3/C3N4 composites, which was rarely reported before.
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