Wang Chen, Mirzaei Amir, Wang Yong, Chaker Mohamed, Zhang Qingzhe, Ma Dongling
Institut National de la Recherche Scientifique (INRS), Centre Énergie Materiaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes, Québec, J3X1P7, Canada.
Shandong Key Laboratory of Environmental Processes and Health, School of Environmental Science and Engineering, Shandong University, Qingdao, 266237, China.
Small Methods. 2025 Feb;9(2):e2301804. doi: 10.1002/smtd.202301804. Epub 2024 Jun 10.
In this study, unique BiVO-Au-CuO nanosheets (NSs) are well designed and multiple charge transfer paths are consequently constructed. The X-ray photoelectron spectroscopy measurement during a light off-on-off cycle and redox capability tests of the photo-generated charge carriers confirmed the formation of Z-scheme heterojunction, which can facilitate the charge carrier separation and transfer and maintain the original strong redox potentials of the respective component in the heterojunction. The ultrathin 2D structure of the BiVO NSs provided sufficient surface area for the photocatalytic reaction. The local surface plasmon resonance (LSPR) effect of the electron mediator, Au NPs, enhanced the light absorption and promoted the excitation of hot electrons. The multiple charge transfer paths effectively promoted the separation and transfer of the charge carrier. The synergism of the abovementioned properties endowed the BiVO-Au-CuO NSs with satisfactory photocatalytic activity in the degradation of tetracycline (Tc) with a removal rate of ≈80% within 30 min under visible light irradiation. The degradation products during the photocatalysis are confirmed by using ultra-high performance liquid chromatography-mass spectrometry and the plausible degradation pathways of Tc are consequently proposed. This work paves a strategy for developing highly efficient visible-light-driven photocatalysts with multiple charge transfer paths for removing organic contaminants in water.
在本研究中，精心设计了独特的BiVO - Au - CuO纳米片（NSs），从而构建了多条电荷转移路径。在光开关循环过程中的X射线光电子能谱测量以及光生电荷载流子的氧化还原能力测试证实了Z型异质结的形成，这有助于电荷载流子的分离和转移，并保持异质结中各组分原有的强氧化还原电位。BiVO NSs的超薄二维结构为光催化反应提供了足够的表面积。电子介质Au NPs的局域表面等离子体共振（LSPR）效应增强了光吸收并促进了热电子的激发。多条电荷转移路径有效地促进了电荷载流子的分离和转移。上述特性的协同作用赋予了BiVO - Au - CuO NSs在可见光照射下对四环素（Tc）降解具有令人满意的光催化活性，在30分钟内去除率约为80%。通过超高效液相色谱 - 质谱法确定了光催化过程中的降解产物，并据此提出了Tc可能的降解途径。这项工作为开发具有多条电荷转移路径的高效可见光驱动光催化剂以去除水中有机污染物铺平了道路。
