In this paper, MgO and CuO/MgO nanomaterials were green-synthesized by Opuntia monacantha plant extract. Phytochemical analysis of methanolic extract of the plant showed the presence of terpenoids and flavonoids which are responsible for the synthesis of nanoparticles. XRD revealed the crystalline nature of cubical MgO and CuO/MgO nanocomposite that exhibited additional peaks related to CuO nanomaterial. FESEM images confirmed 2D flower-like nanosheets of MgO and defective crumpled structure of CuO/MgO nanocomposites. CuO adsorbed on interfaces of MgO nanosheets by making Cu–O–Mg linkage is studied in FTIR spectrum. Improved optical features of CuO/MgO composite and reduced bandgap were confirmed in UV–Vis analysis. Prepared samples were employed in antimicrobial and photocatalysis applications. The prepared MgO, CuO/MgO nanocomposite and their synergism with standard antibiotics showed significant antimicrobial activity against Candida albicans and Bacillus subtilis. CuO/MgO composite showed a higher degradation of methyl orange (MO) (88%) than MgO. These results are expected to develop a new eco-friendly and cheap MgO and CuO/MgO nanocomposite with potent antimicrobial and photocatalytic applications.

本文采用仙人掌绿色合成MgO和CuO/MgO纳米材料植物提取物。植物甲醇提取物的植物化学分析表明，存在负责合成纳米颗粒的萜类化合物和黄酮类化合物。XRD 揭示了立方体 MgO 和 CuO/MgO 纳米复合材料的结晶性质，其表现出与 CuO 纳米材料相关的额外峰。FESEM 图像证实了 MgO 的二维花状纳米片和 CuO/MgO 纳米复合材料的有缺陷的皱褶结构。在 FTIR 光谱中研究了通过形成 Cu-O-Mg 键吸附在 MgO 纳米片界面上的 CuO。在 UV-Vis 分析中证实了 CuO/MgO 复合材料的改进光学特性和减小的带隙。制备的样品用于抗菌和光催化应用。制备的 MgO、CuO/MgO 纳米复合材料及其与标准抗生素的协同作用对白色念珠菌和枯草芽孢杆菌。CuO/MgO 复合材料显示出比 MgO 更高的甲基橙 (MO) (88%) 降解。这些结果有望开发出一种新的环保且廉价的 MgO 和 CuO/MgO 纳米复合材料，具有有效的抗菌和光催化应用。