Abstract

Copper(II) oxide nanoparticles with an average size of 52 ± 5 nm are synthesized by wet combustion of the extract of coronate saw-wort (Serratula coronata L.) growing on the territory of Central Kazakhstan. The complex study of the structure and composition of the synthesized nanoparticles by scanning electron microscopy, energy-dispersive spectroscopy, and X-ray phase analysis shows that the nanoparticles contain no additional impurities, have the monoclinic structure, and possess a high degree of crystallinity; the average size of crystallites is 28 ± 4 nm. Catalytic activity is tested in methylene blue dye degradation under exposure to visible light (500 W, 7500 lm). The degradation efficiency is studied as a function of catalyst mass and initial dye concentration. It is shown that even at a catalyst loading of 10 mg more than 54% of the dye degrades in the reaction mixture. The study of catalyst stability demonstrates that the efficiency of degradation decreases by 6.1 and 33.3% after the second and fifth test cycle, respectively.

中文翻译：

---

锯齿草提取物合成的纳米氧化铜的光催化活性

摘要

通过对加仑锯齿麦汁（Serratula coronata）提取物进行湿式燃烧，合成出平均粒径为52±5 nm的氧化铜（II）纳米颗粒。L.）生长在哈萨克斯坦中部地区。通过扫描电子显微镜，能量分散光谱和X射线相分析对合成纳米颗粒的结构和组成进行了复杂的研究，结果表明该纳米颗粒不含其他杂质，具有单斜晶结构，并且具有很高的结晶度。微晶的平均尺寸为28±4 nm。在暴露于可见光（500 W，7500 lm）的条件下，测试了亚甲基蓝染料降解的催化活性。研究了降解效率与催化剂质量和初始染料浓度的关系。结果表明，即使在催化剂负载量为10 mg的情况下，超过54％的染料也会在反应混合物中降解。催化剂稳定性的研究表明，降解效率降低了6.1和33。