Abstract
A tetragonal cylindrical Bi2O2CO3 self-assembled from nanosheets was formed in situ by interlayered substitution using BiOCl column as the precursor. The β-Bi2O3/Bi2O2CO3 heterojunction was synthesized then by calcining the as-formed Bi2O2CO3. The β-Bi2O3/Bi2O2CO3 showed excellent photocatalytic performance with k values (the apparent rate constants) were 0.1738 and 0.1162min−1, respectively, for degrading 50 mg/L Cr(VI) solution and 10 mg/L MO. Both free radical trapping and electron paramagnetic resonance spectrometer measurements proved that superoxide radical (O2−) was key active species photodegradation of Cr(VI) and MO. The photoluminescent spectroscopy and electrochemical impedance indicated that the β-Bi2O3/Bi2O2CO3 heterojunction had a high separation efficiency of photogenerated charge carriers. This work provides a simple anion exchange synthesis method, which will inspire many researchers to develop high-performance catalysts.
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