Abstract
Bismuth oxyhalides are important visible-light-responsive photocatalysts due to their unique electronic and layered crystal structure. In this study, Pd nanoparticles with the size of about 3–6 nm were loaded on the Bi4O5Br2 nanosheets by applying solvothermal-reduction method. The photoelectrochemical performance and photocatalytic activity for the degradation of Bisphenol A in aqueous solution of Bi4O5Br2 and Pd/Bi4O5Br2 were evaluated. Compared with pure Bi4O5Br2, Pd/Bi4O5Br2 exhibited an excellent photocatalytic activity for the degradation of Bisphenol A in aqueous solution under LED visible light irradiation. 1.0 wt% loading of Pd was found to be most effective for improving the photocatalytic activity of Bi4O5Br2 for the degradation of Bisphenol A and near to 95.8% of degradation was achieved after 70 min LED visible light irradiation. Under 535 and 630 nm monochromatic LED visible light irradiation for 70 min, only 7.9% and 4.8% Bisphenol A were degraded over 1.0% Pd/Bi4O5Br2 photocatalysts, respectively. Therefore, the improved photocatalytic activity of Pd/Bi4O5Br2 is mainly attributed to the formation of a Schottky barrier between the Pd nanoparticle and the Bi4O5Br2 nanosheet, promoting efficient separation of photogenerated electrons and holes.
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