Facile one-pot synthesis of novel hierarchical Bi2O3/Bi2S3 nanoflower photocatalyst with intrinsic p-n junction for efficient photocatalytic removals of RhB and Cr(VI)

The construction of heterojunction system can promote the separation and transfer of photogenerated electronhole pairs, which is conducive to the degradation of sewage. In this paper, heterostructured Bi203/Bi2S3 nanoflowers are fabricated by a one-step hydrothermal method. The microstructure and optical absorption properties are studied through the detailed characterization of this heterojunction. The visible light photo catalytic ability of as-prepared Bi203/1312S3 heterojunctions are investigated by photocatalytic removals of RhB and Cr(VI). The results of photocatalysis indicate that removal efficiencies of RhB and Cr(VI) over Bi203/Bi2S3 heterojunction are higher than those of pure Bi203 and Bi2S3. The improved photocatalytic performance of the -n 'unction between the p-type Bi2S3 and n-type Bi203, and large specific surface areas (46.31 m g-. TilloitoVV;e chanism of composite photocatalysts is explored in detail by active species trapping experiments, N2 ad, _sowtinn_ripqnrprion, the transient photovoltage electrochemical impedance spectroscopy and photoluminescence measurements. This work provides new insights into building ortm efficient and novel heterogeneous photocatalysts and other energy-related devices.