Using boric acid,urea and thiourea as precursors,the surface doping modification of titanium dioxide was carried out by sol-gel method to prepare B-TiO2,N-TiO2,and S-TiO2 photocatalytic composites with different doping amounts of B,N,and S.The effects of doping forms on the photocatalytic activity of TiO2 was investigated by degrading rhodamine B (RhB) under simulated sunlight.The results of SEM and XPS analysis showed that boron elements penetrated into the lattice of TiO2 in the valence state of B3+,and N atoms entered into the TiO2 lattice to form interstitial doping,while S and TiO2 lattice combined instead of O to form S-Ti bonds,which reduced the bandgap energy of TiO2.The photocatalytic oxidative degradation of 10 mg/L RhB was used as a targeted reaction to investigate the degradation rate of the composites for RhB.The results showed that the best photocatalytic performance of B-TiO2,N-TiO2,and S-TiO2 was achieved when the boron doping amount was 6.0% (molar fraction),the nitrogen doping amount was 4.0% (molar mass fraction),and the sulfur doping amount was 0.25g,and the degradation rates reached 88.3%,93.6% and 94.9%,respectively.The order of doping forms affecting the photocatalytic activity was:replacing TiO2 lattice O>gap doping TiO2>replacing TiO2 lattice Ti.
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基金资助
国家自然科学基金(21878024);锦州市指导性科技计划项目(JZ2020B032)
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