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绿色合成的 Ag 修饰的 CeO 纳米粒子:高效光催化剂和潜在的抗菌剂。

Green synthesized Ag decorated CeO nanoparticles: Efficient photocatalysts and potential antibacterial agents.

机构信息

Departmento de Quimica Organicia, Universitidad de Cordoba, Edificio Marie Curie (C-3) Ctra Nnal IV-A, km 396, E14104, Cordoba, Spain.

School of Physical Science and Technology, Lanzhou University, Lanzhou, 730000, PR China.

出版信息

Chemosphere. 2023 Jan;310:136841. doi: 10.1016/j.chemosphere.2022.136841. Epub 2022 Oct 12.

Abstract

Implication of natural resources for manufacturing of nanoparticles is sustainable, economical and contaminant free approach towards ecological and medical applications. Herein, CeO and Ag/CeO nanoparticles are green synthesized from Morinda tinctoria plant extract. The phase structure, surface morphology, optical identity, Ce(III) and Ce(IV) valency of the synthesized CeO and Ag/CeO nanoparticles are explored. The X-ray diffraction analysis indicated the formation of cubic phase CeO and cubic silver decorated CeO nanoparticles. Fourier transform infrared (FTIR) spectroscopy revealed the metal decoration of CeO nanoparticles, metal-oxygen stretching, indicating the plant molecules reduction and stabilization. UV-visible spectroscopy shown the decreased band gap owing to silver modification. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) micrographs displayed spherical morphology of the nanoparticles. Elemental composition and sample purity is assessed by energy dispersive spectroscopy (EDS). Double oxidation of Ce, double splitting energy of Ag and lattice oxygen are observed from X-ray photoelectron spectroscopy (XPS). Photocatalytic activity of Ag/CeO exposed the enhanced photocatalytic activity up to 94% where CeO nanoparticles gave 60% degradation of bromophenol blue (BB). The plasmonic decoration of silver on the ceria surface induced the charge separations and free radical reactions. Moreover, Ag/CeO nanoparticles are seen as superior antibacterial agents than CeO towards both E.coli and S.aureus. Hence, the silver decorated metal oxide photocatalyst successfully degraded the BB dye and inactivated the bacterial strains. This report established a future research in green synthesis of multipurpose metal nanoparticles.

摘要

自然资源在纳米颗粒制造中的应用是一种可持续、经济且无污染的方法,可应用于生态和医疗领域。在此,我们从密蒙花植物提取物中绿色合成了 CeO 和 Ag/CeO 纳米颗粒。研究了合成的 CeO 和 Ag/CeO 纳米颗粒的物相结构、表面形貌、光学性质、Ce(III)和 Ce(IV)价态。X 射线衍射分析表明形成了立方相 CeO 和立方相银修饰的 CeO 纳米颗粒。傅里叶变换红外(FTIR)光谱表明 CeO 纳米颗粒的金属修饰、金属-氧伸缩,表明植物分子的还原和稳定。紫外-可见光谱表明由于银的修饰导致带隙减小。扫描电子显微镜(SEM)和透射电子显微镜(TEM)照片显示了纳米颗粒的球形形貌。能谱(EDS)评估了元素组成和样品纯度。X 射线光电子能谱(XPS)观察到 Ce 的双重氧化、Ag 的双重分裂能和晶格氧。Ag/CeO 的光催化活性表明其光催化活性提高了 94%,而 CeO 纳米颗粒对溴酚蓝(BB)的降解率达到了 60%。银在氧化铈表面的等离子体修饰诱导了电荷分离和自由基反应。此外,Ag/CeO 纳米颗粒对大肠杆菌和金黄色葡萄球菌的抗菌活性均优于 CeO。因此,银修饰的金属氧化物光催化剂成功降解了 BB 染料并使细菌失活。本报告为绿色合成多功能金属纳米颗粒的未来研究奠定了基础。

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