Green synthesis, characterization and catalytic activity of silver nanoparticles using Cassia auriculata flower extract separated fraction.
Green synthesis, characterization and catalytic activity of silver nanoparticles using Cassia auriculata flower extract separated fraction.
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DOI：
10.1016/j.saa.2017.02.024
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发表时间：
2017-05
期刊：
影响因子：
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通讯作者：
K. Muthu;S. Priya
中科院分区：
文献类型：
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作者：
K. Muthu;S. Priya
耳叶决明子，使用正己烷（A1）、氯仿（A2）、乙酸乙酯（A3）和三次蒸馏水（A4）通过分液漏斗对花的水提取物进行分级。浓缩A4级分并确定初步植物化学物质如单宁、类黄酮、糖苷、碳水化合物和多酚化合物的存在。这些植物化学化合物作为还原剂，以及稳定剂的绿色合成银纳米粒子从水溶液银离子。最初，颜色变化和UV-vis吸收表面等离子体共振强，位于435 nm的宽带已经证实了Ag NPs的合成。银纳米颗粒的X射线衍射（XRD）图谱显示出面心立方晶体结构。通过Debye-Scherrer方程计算观察值，以理论确认粒径为18 nm。用高分辨透射电镜观察了纳米银的表面形貌，纳米银颗粒为球形和三角形，粒径在10 ~ 35 nm之间。此外，银纳米粒子对环境中高污染有机物4-硝基苯酚和甲基橙子的还原具有良好的催化活性。银纳米粒子的绿色合成具有环境友好、成本低廉、传统的一点合成法和更好的催化降解环境污染有机染料的性能。
Cassia auriculata L., the flower aqueous extract was fractionated by separating funnel usingn-hexane (A1), chloroform (A2), ethyl acetate (A3) and triple distilled water (A4). The A4 fraction was concentrated and determined the presence of preliminary phytochemicals such as tannins, flavonoids, glycosides, carbohydrates and polyphenolic compounds. These phytochemical compounds acted as reducing as well as a stabilizing agent in the green synthesis of Ag NPs from aqueous silver ions. Initially, the colour change and UV–vis absorbance surface Plasmon resonance strong, wide band located at 435 nm has confirmed the synthesis of Ag NPs. The X-ray diffraction (XRD) pattern of Ag NPs shows a face-centered cubic crystal structure. The observed values were calculated by Debye-Scherrer equation to theoretical confirms the particle size of 18 nm. The surface morphology of Ag NPs was viewed by HRTEM, the particles are spherical and triangle shapes with sizes from 10 to 35 nm. Further, the Ag NPs was effective catalytic activity in the reduction of highly environmental polluted organic compounds of 4-nitrophenol and methyl orange. The green synthesis of Ag NPs seems to eco-friendly, cost-effective, conventional one spot synthesis and greater performance of catalytic degradation of environmentally polluted organic dyes.