The heterojunction structures of BiOCl/ Bi₃O₄Cl , exhibiting considerable visible-light photocatalytic efficiency, were prepared by a simple wet-chemical process at ambient condition. The prepared nanocomposites were characterized by XRD, TEM, and UV-visible diffuse reflectance spectra. Under visible light ( λ≥ 420 nm) irradiation, BiOCl/ Bi₃O₄Cl exhibited an enhanced photocatalytic activity in decomposing 2-propanol (IP) in gas phase and salicylic acid (SA) in aqueous solution, whereas the bare BiOCl and Bi₃O₄Cl showed negligible activities. It is deduced that the remarkable visible-light photocatalytic activity of the BiOCl/ Bi₃O₄Cl originates from the hole (h⁺) transfer between VB of the Bi₃O₄Cl and BiOCl semiconductors.
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Gao et al. (2010) studied this question.
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