In the present study, biosynthesized CeO₂-NPs using Solanum nigrum leaf extract were compared with chemically synthesized one. The synthesized CeO₂-NPs were characterized by UV–Vis, XRD, DLS, ZP, HR-TEM, FT-IR and PL techniques. UV–visible spectrum showed absorption peak in the range of 326–355 nm. DLS studies exposed that the average size of CeO₂-NPs was around 45 nm and the obtained zeta potential value of − 25.83 mV for CeO₂-NPs indicated moderate stability of biosynthesized nanoparticles. HR-TEM images revealed the spherical morphology of the biosynthesized CeO₂-NPs with the size of 20 nm and selected area diffraction pattern revealed the polycrystalline nature of CeO₂-NPs, which was consistent with the XRD result. FT-IR analysis also confirmed the presence of metal oxide. The synthesized CeO₂-NPs exhibited potential photocatalytic activity towards the degradation of methylene blue dye upon exposure to sunlight irradiation. The degradation efficiencies of Chem and biosynthesized CeO₂-NPs towards methylene blue dye were 78.14 and 94.58%, respectively. In addition, antibacterial and antioxidant activity of synthesized CeO₂-NPs is evaluated. The biosynthesized CeO₂-NPs possess highest antibacterial activity against Gram-negative Escherichia coli (22 ± 0.3 mm) and Gram-positive Bacillus subtilis (21 ± 0.4 mm) at 100 μl. The biosynthesized CeO₂-NPs exhibited greater inhibition on DPPH radical IC₅₀ μg/ml value which was 139 ± 45, while it was 131 ± 21 for hydroxyl radical. The present work demonstrated an eco-friendly preparation of CeO₂-NPs with good photocatalytic, antibacterial and antioxidant properties.

在本研究中，将使用龙葵提取物生物合成的CeO ₂ -NPs与化学合成的CeO ₂ -NPs进行了比较。通过UV-Vis，XRD，DLS，ZP，HR-TEM，FT-IR和PL技术对合成的CeO ₂ -NPs进行了表征。紫外可见光谱显示吸收峰在326–355 nm范围内。DLS研究暴露了的CeO的平均尺寸_2个-nps约为45纳米，所获得的ζ电位值- 25.83毫伏的CeO _2个-nps指示生物合成的纳米粒子的中等稳定性。HR-TEM图像显示了生物合成的CeO ₂ -NPs的球形形态，尺寸为20 nm，选定的区域衍射图显示了CeO的多晶性质。₂ -NP，与XRD结果一致。FT-IR分析也证实了金属氧化物的存在。暴露于阳光照射下，合成的CeO ₂ -NPs对亚甲基蓝染料的降解表现出潜在的光催化活性。Chem和生物合成的CeO ₂ -NPs对亚甲基蓝染料的降解效率分别为78.14和94.58％。另外，评价了合成的CeO ₂ -NP的抗菌和抗氧化活性。生物合成的CeO ₂ -NP对革兰氏阴性大肠杆菌（22±0.3 mm）和革兰氏阳性枯草芽孢杆菌具有最高的抗菌活性（21±0.4毫米）在100微升。的生物合成的CeO ₂ -nps显示对DPPH自由基IC更大的抑制₅₀微克/毫升值为139±45，而那是131±21为羟基。本工作证明了具有良好的光催化，抗菌和抗氧化性能的CeO ₂ -NPs的生态友好型制备方法。