Department of Chemistry, Career Point University, Hamirpur, H.P., 176041, India; Centre for Nano-Science and Technology, Career Point University, Hamirpur, H.P., 176041, India.
Department of Chemistry, Career Point University, Hamirpur, H.P., 176041, India; Centre for Nano-Science and Technology, Career Point University, Hamirpur, H.P., 176041, India.
Chemosphere. 2024 Aug;362:142805. doi: 10.1016/j.chemosphere.2024.142805. Epub 2024 Jul 10.
This study presents the green synthesis and multifunctional properties of Cu/NiO nanocomposites (NCs) fabricated with varying ratios (90:10, 80:20, and 70:30) using Commelina benghalensis leaf extract. X-ray diffraction (XRD) analysis confirmed the polycrystalline nature of the NCs, revealing crystallite sizes of 13.62, 13.22, and 7.14 nm. Scanning electron microscopy (SEM) showed rod-shaped and agglomerated particles with sizes ranging from 17.64 to 22.97 nm. Energy-dispersive X-ray spectroscopy (EDX) verified the elemental composition of copper, nickel, oxygen, and carbon. UV-visible spectroscopy determined the energy band gaps to be in the range of 1.24-1.56 eV. Fourier-transform infrared spectroscopy (FT-IR) indicated the presence of bioactive compounds responsible for the reduction of precursor metal salts. The Cu/NiO NCs exhibited remarkable antimicrobial activity, with the 90:10 ratio showing the highest zones of inhibition at 32.76 ± 0.23 mm, 18.66 ± 0.33 mm, and 14.36 ± 0.32 mm against Bacillus subtilis, Staphylococcus aureus, and Escherichia coli, respectively. Additionally, the 70:30 Cu/NiO NCs demonstrated superior antioxidant activity, with a radical scavenging efficiency of 83.22%, closely approaching that of ascorbic acid (96.98%). Photocatalytic evaluations revealed that the NCs were highly effective in degrading environmental pollutants, achieving 97.69% degradation of malachite green and 96.52% of congo red under UV light irradiation. The novelty of this work lies in the use of Commelina benghalensis leaf extract as a sustainable and eco-friendly reducing and stabilizing agent for synthesizing Cu/NiO NCs, offering a green alternative to conventional methods. The synergistic effects between Cu and NiO in the different compositions (90:10, 80:20, and 70:30) enhanced the overall antimicrobial and photocatalytic activities, highlighting their potential for environmental remediation applications.
这项研究展示了使用孟加拉鬼针草叶提取物合成不同比例（90:10、80:20 和 70:30）的 Cu/NiO 纳米复合材料（NCs）的绿色合成和多功能特性。X 射线衍射（XRD）分析证实了 NCs 的多晶性质，显示出晶粒尺寸为 13.62、13.22 和 7.14nm。扫描电子显微镜（SEM）显示出棒状和团聚的颗粒，尺寸范围为 17.64 至 22.97nm。能量色散 X 射线能谱（EDX）证实了铜、镍、氧和碳的元素组成。紫外-可见光谱确定了能隙范围为 1.24-1.56eV。傅里叶变换红外光谱（FT-IR）表明存在生物活性化合物，负责还原前体金属盐。Cu/NiO NCs 表现出显著的抗菌活性，其中 90:10 比例对枯草芽孢杆菌、金黄色葡萄球菌和大肠杆菌的抑菌圈分别为 32.76±0.23mm、18.66±0.33mm 和 14.36±0.32mm。此外，70:30Cu/NiO NCs 表现出优异的抗氧化活性，自由基清除效率为 83.22%，接近抗坏血酸（96.98%）。光催化评价表明，NCs 在降解环境污染物方面非常有效，在紫外光照射下，孔雀石绿的降解率达到 97.69%，刚果红的降解率达到 96.52%。这项工作的新颖之处在于使用孟加拉鬼针草叶提取物作为一种可持续的环保还原剂和稳定剂，用于合成 Cu/NiO NCs，为传统方法提供了一种绿色替代品。不同组成（90:10、80:20 和 70:30）中 Cu 和 NiO 之间的协同作用增强了整体抗菌和光催化活性，突出了它们在环境修复应用中的潜力。
