Abstract
Photocatalytic reduction of Cr(VI) by visible light remains highly challenging. In this work, the composite of Bi3O(PO4)2(OH) embedded on rod-like BiPO4 synthesized by one-pot precipitation method. Changing the synthetic conditions have significant roles for controllable morphologies of BiPO4/Bi3O(PO4)2(OH) heterostructures as well as the photocatalytic efficiency. Under optimal synthetic conditions, BiPO4/Bi3O(PO4)2(OH) heterostructures showed the highest visible light photocatalytic efficiency, which was nearly 44.5 times that of pure BiPO4. The BiPO4/Bi3O(PO4)2(OH) heterostructures exhibited highly effective visible-light photocatalytic reduction of Cr(VI) by the self-photosensitization of adsorbed Cr(VI) combined with the Z-scheme heterojunction charge transfer mechanism under initial pH without adding any sacrificial agent. The report could present a significant approach towards Cr(VI) photoreduction from water through the novel BiPO4/Bi3O(PO4)2(OH) photocatalyst. It will provide an strategy for environmental wastewater treatment, making full use of solar energy. Moreover, it can contribute to future efforts designing heterostructured semiconductor photocatalysts.
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