Center of Excellence for Energy and Environmental Studies, Deenbandhu Chhotu Ram University of Science and Technology, Murthal 131039, India.
Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India.
J Colloid Interface Sci. 2020 Mar 15;563:370-380. doi: 10.1016/j.jcis.2019.12.079. Epub 2019 Dec 19.
The current study reports on investigation of pure ZnO nanoparticles (NPs) and Ag/ZnO nanocomposites (NCs) in which Ag noble metal mixed at different concentration (0.5%, 1.0% and 2.0%) in the presence of Ocimum tenuiflorum (Tulsi) plant seed extract (PSE). The structural, optical, electrical and chemical properties of green synthesized NPs and NCs have been monitored using diffrent analytical techniques such as XRD, SEM, TEM, EDX, UV-Vis, FTIR, EIS and EPR. Further the antimicrobial and dye degradation activity of green synthesized pure ZnO-NPs and 0.5%, 1.0% and 2.0% Ag/ZnO-NCs had been examined. The result showed that synthesized 1.0% Ag/ZnO-NCs possessed a good photocatalytic and antimicrobial activity as compared to pure ZnO-NPs and other prepared Ag/ZnO-NCs. Based on the outcomes of reactive oxygen species (ROS) detection, the improved antimicrobial and dye degradation activities of Ag/ZnO-NCs were attributed due to more ROS formation, as Ag particles on the surface of ZnO are in support of electron transfer, which could improve ROS formation by one-electron reduction of oxygen.
本研究报告了在奥克蒂莫·特努菲洛拉（Tulsi）植物种子提取物（PSE）存在下，用不同浓度（0.5%、1.0%和 2.0%）的银混合合成的纯 ZnO 纳米粒子（NPs）和 Ag/ZnO 纳米复合材料（NCs）的研究。使用不同的分析技术，如 XRD、SEM、TEM、EDX、UV-Vis、FTIR、EIS 和 EPR，监测了绿色合成 NPs 和 NCs 的结构、光学、电学和化学性质。此外，还研究了绿色合成的纯 ZnO-NPs 和 0.5%、1.0%和 2.0%Ag/ZnO-NCs 的抗菌和染料降解活性。结果表明，与纯 ZnO-NPs 和其他制备的 Ag/ZnO-NCs 相比，合成的 1.0%Ag/ZnO-NCs 具有更好的光催化和抗菌活性。基于活性氧物种（ROS）检测的结果，Ag/ZnO-NCs 抗菌和染料降解活性的提高归因于更多的 ROS 形成，因为 ZnO 表面上的 Ag 颗粒支持电子转移，这可以通过氧的单电子还原来提高 ROS 的形成。
