Abstract
Abstract In this study, novel TiO 2 /Ag 2 CrO 4 nanocomposites were fabricated by a facile refluxing method using commercial TiO 2 , silver nitrate, and sodium chromate at low temperature of 96 °C. The as-prepared photocatalysts were characterized by XRD, EDX, SEM, TEM, UV–vis DRS, FT–IR, BET, and PL techniques. Compared with the TiO 2 sample, TiO 2 /Ag 2 CrO 4 nanocomposites exhibited highly enhanced photocatalytic activity in degradations of rhodamine B (RhB), methylene blue (MB), and fuchsine dyes under visible-light irradiation. Among the prepared photocatalysts, the TiO 2 /Ag 2 CrO 4 (50%) nanocomposite showed the superior activity of 8.8, 5.4, and 44-folds relative to the TiO 2 sample in degradations of RhB, MB, and fuchsine, respectively. The trapping experiments demonstrated that holes and superoxide anion radicals were the main reactive species in the degradation reaction. Based on the obtained results, the photocatalytic activity enhancement was attributed to strong visible-light absorption, effective separation of photogenerated charge carriers by internal electrostatic field produced through n–n heterojunction formed between counterparts of the nanocomposite, and enhanced surface area.
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