Cerium (Ce)-doped tin dioxide (SnO₂) nanoparticles (NPs) have been prepared by a facile hydrothermal coprecipitation route for photocatalytic decomposition of methyl orange (MO) dye. The as-obtained NPs were characterized using different physical methods. X-ray diffraction (XRD) analysis found a rutile-phase-like crystalline structure. X-ray photoelectron spectroscopy (XPS) revealed specific energies of 486.2 eV for Sn 3d_3/2 and 497.4 eV for Sn 3d_5/2 and confirmed an oxidation state of Sn⁴⁺. With increasing Ce concentration (from 0% to 2% and 4%), the optical bandgap energy of the SnO₂ NPs reduced (3.4–3.1 eV), resulting in a red-shift that enhanced their photocatalytic activity. The 4% Ce:SnO₂ NPs exhibited superior photodegradation performance against MO organic dye, achieving 94.5% decomposition in 100 min under exposure to ultraviolet–visible (UV–Vis) light. Indeed, the photocatalytic efficiency of the 4% Ce:SnO₂ NPs was 4.9- and 2.44-fold higher than that of the bare SnO₂ and 2% Ce:SnO₂ NPs, respectively. This outstanding photodegradation efficacy of the as-obtained 4% Ce:SnO₂ NPs was due to the effective doping of Ce into the SnO₂ lattice, thus preventing the recombination and allowing the effective separation/migration of photoexcited charges (e⁻/h⁺). Furthermore, improved antibacterial activity against two bacteria was clearly observed when adding Ce dopant to the SnO₂ NPs.

铈（Ce）掺杂的二氧化锡（SnO ₂）纳米颗粒（NPs）已通过一种简便的水热共沉淀途径制备，用于光催化分解甲基橙（MO）染料。使用不同的物理方法对获得的NP进行表征。X射线衍射（XRD）分析发现金红石相状晶体结构。X射线光电子能谱（XPS）显示，Sn 3 d _3/2的比能为486.2 eV，Sn 3 d _5/2的比能为497.4 eV，并证实了Sn ⁴⁺的氧化态。随着Ce浓度的增加（从0％到2％和4％），SnO ₂的光学带隙能量NP减少（3.4–3.1 eV），导致红移，从而增强了它们的光催化活性。4％的Ce：SnO ₂ NPs对MO有机染料表现出优异的光降解性能，在暴露于紫外可见光（UV-Vis）的情况下，在100分钟内可实现94.5％的分解。实际上，4％Ce：SnO ₂ NP的光催化效率分别比裸露SnO ₂和2％Ce：SnO ₂ NP的光催化效率分别高4.9和2.44倍。如此获得的4％Ce：SnO ₂ NP的这种出色的光降解功效是由于将Ce有效掺杂到SnO ₂晶格中，从而防止了重组，并允许有效分离/迁移光激发电荷（e^- / h ⁺）。此外，当将Ce掺杂剂添加到SnO ₂ NP中时，清楚地观察到针对两种细菌的​​改善的抗菌活性。