Abstract
To overcome the limitations of narrow light-response range and rapid electron–hole recombination in the TiO 2 photocatalytic treatment of dye wastewater, we prepared and systematically studied the Bi-doped TiO 2 /montmorillonite composite using the sol–gel method. Results showed that Bi enters the crystal lattice of anatase TiO 2 in the +3 valence state. The highest photocatalytic activity was achieved when the molar ratio of Bi:Ti was 7%. During the photocatalytic treatment, the degradation extent of rhodamine B reached 90.60% under visible-light irradiation. This high photocatalytic activity results from the doping with Bi 3+ ions, which makes the band gap lie between the Ti 4+ 3d and Bi 3+ 6s bands and inhibits the recombination of electrons and holes. • Montmorillonite enhanced the adsorption performance of composite. • Bi doping reduced the band gap. • Holes and electrons were effectively separated. • Dye wastewater could be effectively degraded under visible light irradiation.
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