A facile synthesis of a highly efficient β-Bi2O3/Bi2O2CO3 heterojunction with enhanced photocatalytic NO oxidation under visible light†
The construction of a β-Bi2O3/Bi2O2CO3 heterojunction is an effective approach to separate the photogenerated charge carriers and to improve the photocatalytic performance of the semiconductor photocatalysts. In this study, a composite nanosheet of β-Bi2O3/Bi2O2CO3 was fabricated via an in situ annealing of Bi2O2CO3 at 380 °C. The composite showed an excellent adsorption toward NO and an enhanced photocatalytic efficiency over NO oxidation from 5.7 v/v% (bare Bi2O2CO3) to 32.5 v/v% (β-Bi2O3/Bi2O2CO3). Furthermore, the presence of the β-Bi2O3/Bi2O2CO3 heterojunction promoted the formation of additional ˙O2−, and then improved the NO oxidation activity and safety of BOC in conjunction with ˙OH.