Ag, Zn and Cu nanoparticles synthesized from Eichhornia crassipes leaf extracts and their application in phenol photocat
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.411
Ag, Zn and Cu nanoparticles synthesized from Eichhornia crassipes leaf extracts and their application in phenol photocatalytic degradation. Monserrat Velázquez-Hernández1,2, Pablo Schabes-Retchkiman2, Javier Illescas1, M.G. Macedo1, J.C, González-Juárez1 , Sonia Martínez-Gallegos1*.
1
Tecnológico Nacional de México/ Instituto Tecnlógico de Toluca, División de Estudios de Posgrado, Av. Tecnológico S/N Ex Rancho La Virgen, Metepec, México, C.P. 52140
2
Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal 20-364, Distrito Federal., México.
ABSTRACT
In this study, silver, zinc and copper nanoparticles, AgNPs, ZnNPs and CuNPs, were tested on photodegradation using phenol as a model contaminant. The nanoparticles were phytosynthesized from an aqueous extract of Eichhornia crassipes leaves, and were characterized by UV-visible spectroscopy, EDS (Dispersive Energy X-ray Spectroscopy), SEM (Scanning Electron Microscopy), and TEM (Transmission Electron Microscopy). The AgNPs, ZnNPs and CuNPs showed a characteristic plasmon determined by UV-Vis; in the case of the EDS analyses Ag, Zn and Cu were detected as the main components. The detected composition by TEM corresponded to a metallic oxide for the three nanoparticles. Finally, for the photocatalytic performance on the phenol degradation under UV radiation, they showed about 50%, 52% and 34% with a 10 mg/L phenol solution that was achieved within 200 min using AgNPs, ZnNPs and CuNPs, respectively.
INTRODUCTION Phenols are generally considered to be one of the essential organic pollutants released into the environment since they are highly stable, toxic and harmful to organisms at low concentrations which causes unpleasant taste and odor of drinking
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water [1]. Advanced oxidation processes (AOP) have been found to be effective in degrading a wide variety of organic compounds through reaction with several reactive oxygen species. As one kind of AOP, heterogeneous photocatalysis is a widely used process, in which hydroxyl radicals (•OH) are generated by the interaction of semiconductor catalysts with light irradiation and are able to effectively mineralize persistent compounds such as phenol into CO 2 and H2O [2]. In recent studies, the synthesis of nanoparticles through the phytosynthesis process has presented several advantages over other physical and chemical procedures. Synthesis of metallic nanoparticles using biological molecules derived from plant extracts, could facilitate size and morphology control of metal nanoparticles due to the presence of an innumerable quantity of biomolecules possessing bioreduction and biostabilization ability [3]. Eichhornia crassipes commonly known as a “water lily”, has phytochemicals such as qui
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