Department of Chemistry, University of Western Cape, Robert Sobukwe Road, Private Bag X17, Bellville 7535, South Africa.
Department of Applied Sciences, Faculty of Natural Sciences, Walter Sisulu University, Old King William Town Road, Potsdam Site, East London 5200, South Africa.
Int J Mol Sci. 2024 Oct 29;25(21):11621. doi: 10.3390/ijms252111621.
This work presents a green synthesis route, which utilises extracts from an indigenous plant in South Africa, eastern and southern Africa that is understudied and underutilised, for preparing zinc oxide nanoparticles (ZnO NPs). This study involved optimisation of the green synthesis method using (L.O.) extracts and performing comparative studies on the effects of using different zinc (Zn) salt precursors; zinc sulphate heptahydrate (Z001) and zinc acetate dihydrate (Z002) to synthesise the ZnO NPs. The comparative studies also compared the L.O-mediated ZnO NPs and chemical-mediated ZnO NPs (Z003). The as-prepared ZnO NPs were tested for their effectiveness in the photodegradation of methylene blue (MB) dye. Furthermore, antibacterial studies were conducted using the agar well diffusion method on () and () bacteria. The structural, morphological, and optical characteristics of the synthesised ZnO NPs were analysed using XRD, FTIR, SEM, EDS, DRS, and BET techniques. The XRD results indicated that the L.O-mediated ZnO NPs had smaller crystallite sizes (18.24-19.32 nm) than their chemically synthesised counterparts (21.50 nm). FTIR confirmed the presence of biomolecules on the surface of the L.O-mediated NPs, and DRS analysis revealed bandgap energies between 3.07 and 3.18 eV. The EDS results confirmed the chemical composition of the synthesised ZnO NPs, which were made up of Zn and O atoms. Photocatalytic studies demonstrated that the L.O-mediated ZnO NPs (Z001) exhibited a superior degradation efficiency of the MB dye (89.81%) compared to chemically synthesised ZnO NPs (56.13%) under ultraviolet (UV) light for 240 min. Antibacterial tests showed that L.O-mediated ZnO NPs were more effective against than . The enhanced photocatalytic and antibacterial properties of L.O-mediated ZnO NPs highlight their potential for environmental remediation and antimicrobial applications, thus supporting sustainable development goals.
这项工作提出了一种绿色合成途径，利用南非、东部和南部非洲一种研究和利用不足的本土植物提取物来制备氧化锌纳米粒子 (ZnO NPs)。本研究涉及使用 (L.O.) 提取物优化绿色合成方法，并对使用不同锌 (Zn) 盐前体（七水合硫酸锌 (Z001) 和二水合乙酸锌 (Z002)）合成 ZnO NPs 的效果进行比较研究。比较研究还比较了 L.O.介导的 ZnO NPs 和化学介导的 ZnO NPs (Z003)。所制备的 ZnO NPs 用于光降解亚甲基蓝 (MB) 染料的有效性测试。此外，还使用琼脂孔扩散法对 （）和 （）细菌进行了抗菌研究。使用 XRD、FTIR、SEM、EDS、DRS 和 BET 技术分析了合成 ZnO NPs 的结构、形貌和光学特性。XRD 结果表明，L.O.介导的 ZnO NPs 的晶粒度（18.24-19.32nm）小于化学合成的 ZnO NPs（21.50nm）。FTIR 证实了 L.O.介导的 NPs 表面存在生物分子，DRS 分析表明带隙能在 3.07-3.18eV 之间。EDS 结果证实了合成 ZnO NPs 的化学组成，由 Zn 和 O 原子组成。光催化研究表明，在 240 分钟的紫外 (UV) 光下，L.O.介导的 ZnO NPs (Z001) 对 MB 染料的降解效率（89.81%）明显优于化学合成的 ZnO NPs（56.13%）。抗菌测试表明，L.O.介导的 ZnO NPs 对 更有效。L.O.介导的 ZnO NPs 增强的光催化和抗菌性能突出了它们在环境修复和抗菌应用方面的潜力，从而支持可持续发展目标。
