R. Lu,S.-Z. Zhao,Y. Yang,Y. Wang,H.-L. Huang,Y.-D. Hu,R.D. Rodriguez,J.-J. Chen
TiO 2 nanotubes decorated with Bi 2 O 3 /Bi 2 O 2.33 nanosheets were prepared through a facile avenue that combines sacrifice template and hydrothermal methods . The TiO 2 nanotube structure provided a large specific surface area, and the TiO 2 /(Bi 2 O 3 /Bi 2 O 2.33 ) heterojunction broadened the light absorption range by reducing the bandgap to 2.746 eV. The TiO 2 /(Bi 2 O 3 /Bi 2 O 2.33 ) heterostructure demonstrated high adsorption capability for methyl orange (100 mg/L) with a 70% adsorption rate after 60 min. The photocatalytic performance of the TiO 2 /(Bi 2 O 3 /Bi 2 O 2.33 ) heterostructure was evaluated through the degradation of rhodamine B (RhB) and tetracycline hydrochloride (TCH). The removal rates of RhB (10 mg/L) and high concentration TCH (50 mg/L) could reach 93% and 96% after 60 min and 120 min of light irradiation, respectively. Theoretical calculations showed that the TiO 2 /(Bi 2 O 3 /Bi 2 O 2.33 ) structure enhanced photogenerated charge separation, leading to improved degradation of organic pollutants. This study provides a facile way for designing and creating heterostructural nanotubes with enhanced performance for removing organic pollutants.
In the process of photocatalytic ammonia synthesis , efficient activation of nitrogen molecules constitutes a fundamental challenge. During the N 2 activation, the close interdependence between the acceptance and donation of electron results in their mutual limitation, leading to high energy barrier for N 2 activation and unsatisfactory photocatalytic performance. This work decoupled the electron acceptance and donation processes by constructing Fe-Bi dual active sites, resulting in enhancing N 2 activation through the high electron trapping ability of Fe 3+ and strong electron donating ability of Bi 2+ . The photocatalytic nitrogen reduction efficiency of 3%Fe/Bi 2 O 2.33 (118.71 μmol g cat −1 h −1 ) is 5.3 times that of Bi 2 O 2.33 (22.41 μmol g cat −1 h −1 ). In-situ Fourier transform infrared (In situ FTIR) spectroscopy and density functional theory (DFT) calculations manifest that Fe 3+ -Bi 2+ dual active sites work together to promote nitrogen adsorption and activation, and the reaction path is more inclined toward alternate hydrogenation path. N 2 adsorption and activation properties are optimized by heteronuclear bimetallic active sites, which offers a new way for the rational design of nitrogen-fixing photocatalysts .
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