Abstract Exploring effective strategies to strengthen the photoresponse and charge separation efficiency is crucial for the preparation of photocatalysts with superior-performance. Herein, series of 0D-2D Ag2O/Bi5O7I heterojunctions with UV–Vis-NIR spectrum response were prepared by modifying Ag2O on the surface of porous Bi5O7I nanosheets to boost the photocatalytic degradation of bisphenol A. The modified p-type Ag2O semiconductor not only extends the optical absorbance range of the prepared p-n heterojunction but also improves the separation efficiency of photoinduced charge carriers by the internal electric field. Moreover, the unique porous thin-layer structure can further shorten the transport distance of bulk charges to the surface. In addition, uniformly distributed holes are able to provide more active sites to accelerate charge depletion on Bi5O7I substrate. As a result, the interfacial coulomb electrostatic repulsive force was greatly weakened, making it easier for the charge transferences from Ag2O to Bi5O7I under the internal electric field. Therefore, the prepared p-n heterojunction exhibited excellent performance in photocatalytic degradation of bisphenol A. In particular, 25% Ag2O/Bi5O7I showed the best bisphenol A degradation performance, which was 7.23 and 4.39 times than that of pristine Ag2O and Bi5O7I, respectively. In addition, the prepared samples showed excellent photocorrosion resistance, due to the rapid consumption of enriched electrons by the porous structure. Furthermore, intermediates of bisphenol A degradation reaction were characterized by liquid mass method, and then the degradation pathway was deduced. This work is of significance to the construction and design of efficient photocatalysts with full spectral response and high photoelectric conversion efficiency.

中文翻译：

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用于紫外-可见-近红外活化高效光催化降解双酚 A 的新型 pn 型多孔 Ag2O/Bi5O7I 异质结：光电特性和降解机制

摘要 探索增强光响应和电荷分离效率的有效策略对于制备性能优异的光催化剂至关重要。在此，通过对多孔 Bi5O7I 纳米片表面的 Ag2O 进行改性以促进双酚 A 的光催化降解，制备了一系列具有 UV-Vis-NIR 光谱响应的 0D-2D Ag2O/Bi5O7I 异质结。制备的 pn 异质结的光吸收范围，但也提高了内电场对光生电荷载流子的分离效率。此外，独特的多孔薄层结构可以进一步缩短体电荷到表面的传输距离。此外，均匀分布的空穴能够提供更多的活性位点以加速 Bi5O7I 衬底上的电荷耗尽。结果，界面库仑静电排斥力大大减弱，使得电荷在内部电场作用下从 Ag2O 转移到 Bi5O7I 变得更加容易。因此，制备的 pn 异质结在光催化降解双酚 A 方面表现出优异的性能。尤其是 25% Ag2O/Bi5O7I 的双酚 A 降解性能最好，分别是原始 Ag2O 和 Bi5O7I 的 7.23 倍和 4.39 倍。此外，由于多孔结构对富集电子的快速消耗，制备的样品显示出优异的耐光腐蚀性能。此外，双酚A降解反应的中间体采用液质法表征，然后推导出降解途径。该工作对于构建和设计具有全光谱响应和高光电转换效率的高效光催化剂具有重要意义。