Suhag Mahmudul Hassan, Khatun Aklima, Tateishi Ikki, Furukawa Mai, Katsumata Hideyuki, Kaneco Satoshi
Department of Applied Chemistry, Graduate School of Engineering, Mie University, Tsu, Mie 514-8507, Japan.
Department of Chemistry, University of Barishal, Barishal 8254, Bangladesh.
ACS Omega. 2024 Oct 30;9(45):45090-45103. doi: 10.1021/acsomega.4c05679. eCollection 2024 Nov 12.
The ability of the heterojunction between two distinct semiconductors with appropriately matched band gaps to improve the separation of photogenerated electron-hole pairs has been demonstrated to enhance photocatalytic activity. Hence, ZnO/g-CN composites have been fabricated by the facile deposition and calcination of ZnO and g-CN. X-ray photoelectron spectroscopy, powder X-ray diffraction, and Fourier transform infrared spectroscopy confirm the formation of the composite. Scanning electron microscope, transmission electron microscope, and energy-dispersive X-ray spectroscopy morphological analysis reveal that ZnO was homogeneously spread over the g-CN surface. UV-vis diffuse reflectance spectroscopy analysis shows the slightly enhanced visible light absorption ability of the composite. Photoluminescence (PL) spectroscopy and electrochemical impedance spectroscopy analysis prove the higher charge separation of the composite during the irradiation of light. The composite shows admirable photocatalytic efficiency in the visible light-driven photocatalytic degradation of an aqueous diclofenac (DFC) solution. The superoxide anion radical (•O ) and hydroxyl radical (•OH) act as reactive species during the degradation reaction. Probable reaction mechanisms have been proposed.
具有适当匹配带隙的两种不同半导体之间的异质结改善光生电子 - 空穴对分离的能力已被证明可增强光催化活性。因此，通过ZnO和g-CN的简便沉积和煅烧制备了ZnO/g-CN复合材料。X射线光电子能谱、粉末X射线衍射和傅里叶变换红外光谱证实了复合材料的形成。扫描电子显微镜、透射电子显微镜和能量色散X射线光谱形态分析表明，ZnO均匀地分布在g-CN表面。紫外 - 可见漫反射光谱分析表明复合材料的可见光吸收能力略有增强。光致发光（PL）光谱和电化学阻抗谱分析证明了复合材料在光照期间具有更高的电荷分离效率。该复合材料在可见光驱动的双氯芬酸（DFC）水溶液光催化降解中表现出优异的光催化效率。超氧阴离子自由基（•O ）和羟基自由基（•OH）在降解反应中作为活性物种。提出了可能的反应机制。
