Luan Jingfei, Liu Anan, Hao Liang, Liu Boyang, Zeng Hengchang
School of Physics, Changchun Normal University, Changchun 130032, China.
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China.
Nanomaterials (Basel). 2025 Aug 21;15(16):1290. doi: 10.3390/nano15161290.
A pyrochlore-type crystal structure photocatalytic nanomaterial, HoFeSbO, was successfully synthesized using a hydrothermal method. Additionally, a fluorite-structured BiYbO was prepared via rare earth Yb doping. Finally, a novel HoFeSbO/BiYbO heterojunction photocatalyst (HBHP) was fabricated using a solvothermal method. The crystal structure, surface morphology, and physicochemical properties of the samples were characterized using XRD, a micro-Raman spectrometer, FT-IR, XPS, ultraviolet photoelectron spectroscopy (UPS), TEM, and SEM. The results showed that HoFeSbO possessed a pyrochlore-type cubic crystal structure (space group Fd-3m, No. 227), while BiYbO featured a fluorite-type cubic structure (space group Fm-3m, No. 225). The results of the degradation experiment indicated that when HBHP, HoFeSbO, or BiYbO was employed as a photocatalytic nanomaterial, following 140 min of visible light irradiation, the removal efficiency of ciprofloxacin (CIP) reached 99.82%, 86.15%, or 73.86%, respectively. This finding strongly evidenced the remarkable superiority of HBHP in terms of photocatalytic performance. Compared to the individual catalyst HoFeSbO, BiYbO, or N-doped TiO, the removal efficiency of CIP by HBHP was 1.16 times, 1.36 times, or 2.52 times higher than that by HoFeSbO, BiYbO, or N-doped TiO, respectively. The radical trapping experiments indicated that in the CIP degradation process, the hydroxyl radical owned the strongest oxidation ability, followed by the superoxide anion and the photoinduced hole. These studies are of great significance for the degradation of antibiotics and environmental protection.
采用水热法成功合成了一种烧绿石型晶体结构的光催化纳米材料HoFeSbO。此外，通过稀土Yb掺杂制备了萤石结构的BiYbO。最后，采用溶剂热法制备了一种新型的HoFeSbO/BiYbO异质结光催化剂（HBHP）。利用X射线衍射仪（XRD）、显微拉曼光谱仪、傅里叶变换红外光谱仪（FT-IR）、X射线光电子能谱仪（XPS）、紫外光电子能谱仪（UPS）、透射电子显微镜（TEM）和扫描电子显微镜（SEM）对样品的晶体结构、表面形貌和物理化学性质进行了表征。结果表明，HoFeSbO具有烧绿石型立方晶体结构（空间群Fd-3m，编号227），而BiYbO具有萤石型立方结构（空间群Fm-3m，编号225）。降解实验结果表明，当将HBHP、HoFeSbO或BiYbO用作光催化纳米材料时，在可见光照射140分钟后，环丙沙星（CIP）的去除效率分别达到99.82%、86.15%或73.86%。这一发现有力地证明了HBHP在光催化性能方面具有显著优势。与单独的催化剂HoFeSbO、BiYbO或N掺杂TiO相比，HBHP对CIP的去除效率分别比HoFeSbO、BiYbO或N掺杂TiO高1.16倍、1.36倍或2.52倍。自由基捕获实验表明，在CIP降解过程中，羟基自由基的氧化能力最强，其次是超氧阴离子和光生空穴。这些研究对抗生素降解和环境保护具有重要意义。
