Gathiru Marylyn Mugure, Obuya Emilly, Noah Naumih M, Masika Erick
Department of Chemistry, Kenyatta University, P.O. Box 43844-00100 Nairobi, Kenya.
Department of Chemistry, Russell Sage College, P.O. Box 65 1st Street Troy, NY, 12180, United States.
Heliyon. 2024 Jul 26;10(15):e35284. doi: 10.1016/j.heliyon.2024.e35284. eCollection 2024 Aug 15.
This work synthesized Ag/TiO nanocomposite via an aqueous reduction method using a green and chemical reducing agent. (watermelon) rind extract (WMRE) and sodium borohydride (NaBH) were used as the reducing agents during green synthesis and chemical synthesis, respectively. During green synthesis, a pH of 12, a reaction time of 45 min, and an operating temperature of 100 °C yielded the best visible light activity. The biosynthesized and chemically-synthesized Ag/TiO were compared using UV-Vis spectroscopy, X-ray fluorescence spectroscopy (XRF), X-ray diffraction spectroscopy (XRD), Fourier transform infrared spectroscopy (FTIR), energy dispersive spectroscopy-scanning electron microscopy (EDS-SEM) and transmission electron microscopy (TEM). Synthesis using WMRE yielded spherical Ag nanoparticles modified on the surface of TiO nanoparticles. The Ag nanoparticles had enhanced monodispersity with an average diameter of 7.48 4.06 nm. Therefore, the developed WMRE green synthesis method provides a simple, less chemical-intensive, and effective alternative to chemical synthesis.
本研究通过水相还原法，使用绿色化学还原剂合成了Ag/TiO纳米复合材料。在绿色合成和化学合成过程中，分别使用（西瓜）皮提取物（WMRE）和硼氢化钠（NaBH）作为还原剂。在绿色合成过程中，pH值为12、反应时间为45分钟、操作温度为100°C时，可见光活性最佳。使用紫外可见光谱、X射线荧光光谱（XRF）、X射线衍射光谱（XRD）、傅里叶变换红外光谱（FTIR）、能量色散光谱-扫描电子显微镜（EDS-SEM）和透射电子显微镜（TEM）对生物合成和化学合成的Ag/TiO进行了比较。使用WMRE合成得到了修饰在TiO纳米颗粒表面的球形Ag纳米颗粒。Ag纳米颗粒具有增强的单分散性，平均直径为7.48±4.06nm。因此，所开发的WMRE绿色合成方法为化学合成提供了一种简单、化学强度低且有效的替代方法。
