Department of Environmental Sciences, Fatima Jinnah Women University, Rawalpindi, Pakistan.
Environ Technol. 2019 Dec;40(28):3745-3761. doi: 10.1080/09593330.2018.1488888. Epub 2018 Jun 19.
The present study has for the first time reported leaf extract-mediated zinc oxide nanoparticles (ZnO NPs) in a green and one-pot synthetic mode without utilization of any chemical reducing agents. Synthesized nanoparticles were analysed by ultraviolet-visible (UV-Vis) spectroscopy, X-ray diffraction (XRD), Fourier transmission infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). UV-Vis peak was detected at 380 nm due to surface plasmon resonance. A variety of biomolecules were revealed by FTIR involved in reduction cum stabilization of ZnO NPs. Wurtzite hexagonal geometry with an average crystallite size of 12 nm was obtained from XRD diffraction pattern. SEM exhibited size ranges of 80-100 nm and 60-100 nm for 200°C and 600°C calcination temperatures. Synthesized nanoparticles were used as bio-cleaning photocatalysts against organic pollutants, i.e. bromocresol green, bromophenol blue, methyl red and methyl blue, which yielded pseudo-first-order reaction kinetics ( = 0.98, 0.92, 0.92 and 0.90, respectively). Pollutants expressed higher degradation percentages in less than 14 min in direct solar irradiance. Moreover, synthesized nanoparticles were tested against resistant microbes, i.e. and for the development of a new generation of antimicrobial agents.
本研究首次报道了在无任何化学还原剂的情况下，采用叶片提取物介导的绿色一锅法合成氧化锌纳米粒子（ZnO NPs）。通过紫外-可见（UV-Vis）光谱、X 射线衍射（XRD）、傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）对合成的纳米粒子进行了分析。由于表面等离子体共振，在 380nm 处检测到 UV-Vis 峰。FTIR 揭示了多种参与 ZnO NPs 还原和稳定的生物分子。从 XRD 衍射图谱中得到了具有平均晶粒尺寸为 12nm 的纤锌矿六方几何形状。SEM 显示，在 200°C 和 600°C 的煅烧温度下，纳米粒子的尺寸范围分别为 80-100nm 和 60-100nm。合成的纳米粒子被用作生物清洁光催化剂，以对抗有机污染物，如溴甲酚绿、溴酚蓝、甲基红和亚甲基蓝，它们产生了准一级反应动力学（分别为 0.98、0.92、0.92 和 0.90）。在直接太阳照射下，污染物在不到 14 分钟内就表现出更高的降解百分比。此外，还测试了合成的纳米粒子对耐药微生物的作用，如 和 ，以开发新一代抗菌剂。
