CONACYT-Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Santiago de Querétaro, Qro 76230, Mexico.
Ultrason Sonochem. 2021 May;73:105521. doi: 10.1016/j.ultsonch.2021.105521. Epub 2021 Mar 15.
In this research, a sonochemical activation-assisted biosynthesis of Au/FeO nanoparticles is proposed. The proposed synthesis methodology incorporates the use of Piper auritum (an endemic plant) as reducing agent and in a complementary way, an ultrasonication process to promote the synthesis of the plasmonic/magnetic nanoparticles (Au/FeO). The synergic effect of the green and sonochemical synthesis favors the well-dispersion of precursor salts and the subsequent growth of the Au/FeO nanoparticles. The hybrid green/sonochemical process generates an economical, ecological and simplified alternative to synthesizing Au/FeO nanoparticles whit enhanced catalytic activity, pronounced magnetic properties. The morphological, chemical and structural characterization was carried out by high- resolution Scanning electron microscopy (HR-SEM), Energy Dispersive X-Ray Spectroscopy (EDS) and X-Ray diffraction (XRD), respectively. Ultraviolet-visible (UV-vis) and X-ray photoelectron (XPS) spectroscopy confirm the Au/FeO nanoparticles obtention. The magnetic properties were evaluated by a vibrating sample magnetometer (VSM). Superparamagnetic behavior, of the Au/ FeO nanoparticles was observed (M = 51 emu/g and H = 30 Oe at 300 K). Finally, the catalytic activity was evaluated by sonocatalytic degradation of methyl orange (MO). In this stage, it was possible to achieve a removal percentage of 91.2% at 15 min of the sonocatalytic process (160 W/42 kHz). The initial concentration of the MO was 20 mg L, and the Fe3O4-Au dosage was 0.075 gL. The MO degradation process was described mathematically by four kinetic adsorption models: Pseudo-first order model, Pseudo-second order model, Elovich and intraparticle diffusion model.
在这项研究中，提出了一种超声激活辅助生物合成 Au/FeO 纳米粒子的方法。所提出的合成方法采用 Piper auritum（一种特有植物）作为还原剂，并采用超声处理来促进等离子体/磁性纳米粒子（Au/FeO）的合成。绿色和超声化学合成的协同效应有利于前体盐的良好分散以及随后 Au/FeO 纳米粒子的生长。该绿色/超声协同工艺生成了一种经济、生态和简化的替代方法，用于合成具有增强催化活性和显著磁性的 Au/FeO 纳米粒子。通过高分辨率扫描电子显微镜（HR-SEM）、能量色散 X 射线光谱（EDS）和 X 射线衍射（XRD）分别进行了形态、化学和结构表征。紫外-可见（UV-vis）和 X 射线光电子能谱（XPS）光谱证实了 Au/FeO 纳米粒子的获得。通过振动样品磁强计（VSM）评估了磁性特性。观察到 Au/FeO 纳米粒子的超顺磁性行为（M=51 emu/g，H=30 Oe 在 300 K）。最后，通过超声催化降解甲基橙（MO）评估了催化活性。在该阶段，在超声催化过程的 15 分钟内可以达到 91.2%的去除率（160 W/42 kHz）。MO 的初始浓度为 20 mg L，Fe3O4-Au 剂量为 0.075 gL。MO 降解过程通过四个动力学吸附模型进行了数学描述：准一级动力学模型、准二级动力学模型、Elovich 模型和内扩散模型。
