Abstract
Bi2WO6/Bi2O3/WO3 composites were successfully prepared by a facile carbon adsorption strategy. The structure of Bi2WO6 composites can be controlled by adjusting Bi/W molar ratio and precursor pH. The photocatalytic activity of the sample was assessed for the degradation of metronidazole under visible light irradiation. The Bi2WO6/WO3 composite synthesized at Bi/W molar ratio of 1:1 displayed higher photocatalytic performance than other samples due to its WO3-Bi2WO6 n–n heterojunction and narrow bandgap and which made this sample respond to visible light, especially the wavelength after 500 nm and efficiently inhibited recombination of electron–hole pairs. The presence of NaCl in metronidazole solution significantly decreased photodegradation efficiency of metronidazole from 93.3 to 65.2% within 180 min. The negative effect of NaCl on degradation activity can be ascribed to quenching of oxidizing radicals and valence band holes.
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