Abstract
The crystal phase has an important effect on the photocatalytic activity of Bi2O3. However, due to the high recombination of photo-induced charge carriers in single crystal phase Bi2O3, the photocatalytic activity was still unsatisfied. Herein, we prepared a novel α/β-Bi2O3 hetero-phase junction (xB) by a simple solvothermal-calcination method, the photocatalyst was well characterized by XRD, SEM, TEM, UV–vis DRS, XPS, photoelectrochemical technology, etc. The characterizations indicated that the crystal phase of Bi2O3 gradually transformed from β phase to α phase as the calcination temperature increased, and the Bi2O3 of different crystal phases were in close contact with a clear interface. With the optimum calcination temperature at 400 ℃, 400B sample showed the highest photocatalytic activity for tetracycline hydrochloride (TC-HCl) degradation, 91.4% removal within 120 min, the kinetic rate (0.0188 min−1) was 3.2 and 3.1 times higher than that of β-Bi2O3 (0.0058 min−1) and α-Bi2O3 (0.0061 min−1), respectively. This work provides an ideal strategy to synthesize hetero-phase junction photocatalysts with the crystal phase transition of semiconductors.
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