El Mragui Abderrahim, Logvina Yuliya, Pinto da Silva Luís, Zegaoui Omar, Esteves da Silva Joaquim C G
Chemistry Research Unit (CIQUP), Faculty of Sciences of University of Porto, Rua do Campo Alegre 697, 4169-007 Porto, Portugal.
Research team "Materials and Applied Catalysis: MCA", "CBAE" Laboratory, Faculty of Sciences, Moulay Ismail University, BP.11201 Zitoune, Meknès, Morocco.
Materials (Basel). 2019 Nov 24;12(23):3874. doi: 10.3390/ma12233874.
Pure TiO and Fe- and Co-doped TiO nanoparticles (NPs) as photocatalysts were synthesized using wet chemical methods (sol-gel + precipitation). Their crystalline structure and optical properties were analyzed using X-ray diffraction (XRD), Raman spectroscopy and Fourier-transform infrared (FTIR) spectroscopy, ultraviolet-visible light (UV-Vis) diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. The photocatalytic activity of the synthesized nanoparticles was evaluated through degradation of carbamazepine (CBZ) under UV-A and visible-light irradiations. The XRD and Raman analyses revealed that all synthesized nanomaterials showed only the anatase phase. The DRS results showed that the absorption edge was blue-shifted for Fe-doped TiO NPs. The decrease in charge recombination was evidenced from the PL investigation for both Co-doped and Fe-doped TiO nanomaterials. An enhancement in photocatalytic degradation of carbamazepine in aqueous suspension under both UV-A light and visible-light irradiations was observed for Fe-doped Titania NPs by comparison with pure TiO. These results suggest that the doping cations could suppress the electron/hole recombination. Therefore, the photocatalytic activity of TiO-based nanomaterials was enhanced.
采用湿化学方法（溶胶 - 凝胶 + 沉淀法）合成了纯TiO以及Fe和Co掺杂的TiO纳米颗粒（NPs）作为光催化剂。使用X射线衍射（XRD）、拉曼光谱、傅里叶变换红外（FTIR）光谱、紫外 - 可见光（UV - Vis）漫反射光谱（DRS）和光致发光（PL）光谱对其晶体结构和光学性质进行了分析。通过在UV - A和可见光照射下对卡马西平（CBZ）的降解来评估合成纳米颗粒的光催化活性。XRD和拉曼分析表明，所有合成的纳米材料仅呈现锐钛矿相。DRS结果表明，Fe掺杂的TiO NPs的吸收边发生蓝移。通过PL研究证明，Co掺杂和Fe掺杂的TiO纳米材料的电荷复合均减少。与纯TiO相比，Fe掺杂的二氧化钛NPs在UV - A光和可见光照射下的水悬浮液中对卡马西平的光催化降解均有增强。这些结果表明，掺杂阳离子可以抑制电子/空穴复合。因此，增强了TiO基纳米材料的光催化活性。
