Kumar Brajesh, Smita Kumari, Cumbal Luis, Debut Alexis
Centro de Nanociencia y Nanotecnologia, Universidad de las Fuerzas Armadas ESPE, Av. Gral. Rumiñahui s/n, Sangolqui, P.O. BOX 171-5-231B, Ecuador; Department of Chemistry, TATA College, Kolhan University, Chaibasa 833202, Jharkhand, India.
Centro de Nanociencia y Nanotecnologia, Universidad de las Fuerzas Armadas ESPE, Av. Gral. Rumiñahui s/n, Sangolqui, P.O. BOX 171-5-231B, Ecuador.
J Photochem Photobiol B. 2016 May;158:55-60. doi: 10.1016/j.jphotobiol.2016.02.023. Epub 2016 Feb 28.
In this report, a simple and cost-effective methodology has been developed to obtain gold nanoparticles (AuNPs) using Sacha inchi (Plukenetia volubilis) oil in the presence of sunlight. The spectroscopic and morphological properties of AuNPs were characterized by using UV-vis spectroscopy, transmission electron microscopy (TEM), particle size analyzer, and X-ray diffraction (XRD). UV-vis and TEM reveal that the nanostructure of the gold particles has surfaced plasmon resonance at 515-520nm and is almost spherical in shape with an average size of 5-15nm. XRD studies confirmed the face cubic center (fcc) unit cell structure of AuNPs. The as-synthesized AuNPs showed remarkable photocatalytic decomposition of the methylene blue (>75%) without using any reducing agent and weak antioxidant activity (21-16%) against 1,1-diphenyl-2-picrylhydrazyl at the different sunlight exposure times. The experimental approach is promising and suggested that the sunlight is a good source of energy for enhancement of AuNP synthesis via Sacha inchi oil and its photocatalytic activity.
在本报告中，已开发出一种简单且具有成本效益的方法，即在阳光照射下使用印加果（南美油藤）油来制备金纳米颗粒（AuNPs）。通过紫外可见光谱、透射电子显微镜（TEM）、粒度分析仪和X射线衍射（XRD）对AuNPs的光谱和形态特性进行了表征。紫外可见光谱和TEM显示，金颗粒的纳米结构在515 - 520nm处具有表面等离子体共振，形状几乎为球形，平均尺寸为5 - 15nm。XRD研究证实了AuNPs的面心立方（fcc）晶胞结构。合成的AuNPs在不同的阳光照射时间下，无需使用任何还原剂即可对亚甲基蓝表现出显著的光催化分解作用（>75%），并且对1,1 - 二苯基 - 2 - 苦基肼具有较弱的抗氧化活性（21 - 16%）。该实验方法很有前景，表明阳光是通过印加果油增强AuNP合成及其光催化活性的良好能量来源。
