AuCu, AgCu and AuAg Bimetallic Nanoparticles: Synthesis, Characterization and Water Remediation
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AuCu, AgCu and AuAg Bimetallic Nanoparticles: Synthesis, Characterization and Water Remediation Judith Tanori1, Diana Vargas-Hernández1,2, Elisa Martínez-Barbosa1, Raúl Borja-Urby3, Arturo García-Bórquez4, Jesús Arenas-Alatorre5 and Amir Maldonado6 1 Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora, 83000 Hermosillo, Sonora, México. 2 Catedrática CONACYT – Universidad de Sonora, 83000 Hermosillo, Sonora, México. 3 Centro de Nanociencias y Micro y Nanotecnologías, Instituto Politécnico Nacional, México, D. F., México. 4 Escuela Superior de Física y Matemáticas, Instituto Politécnico Nacional, México, D. F, México. 5 Instituto de Física, Universidad Nacional Autónoma de México, México, D. F., México. 6 Departamento de Física, Universidad de Sonora, 83000 Hermosillo, Sonora, México.
ABSTRACT Self-assembling systems of amphiphilic molecules display structures similar to those of biomineralization natural systems. This allows to somehow mimic nature to synthesize nanomaterials with low polidispersity and with diverse morphologies. In this work we describe the synthesis and characterization of gold-copper, silver-copper, and gold-silver bimetallic nanoparticles by chemical reduction in self-assembling systems of two surfactants. The nanoparticles were characterized by Transmission Electron Microscopy and UV-Vis spectroscopy. We have prepared a composite material using mesoporous silica as support of the AuAg bimetallic nanoparticles. The system was used in photocatalysis experiments for water remediation applications. Our results show that the AuAg/SBA15 composite material degrades methyl orange in water from 17 ppm to 4 ppm in 30 minutes. INTRODUCTION Matter displays different physical and chemical properties in the nanometer scale as compared to the bulk state. These differences include the electrical, magnetic, optical, thermal, catalytic and adsorption behavior of materials. Nanotechnology offers thus the possibility of conceiving new systems for novel applications. Interestingly, certain materials like gold, do not present catalytic activity in the bulk state, however they display it when prepared in the form of particles with dimensions in the nanometer scale [1,2]. Moreover, the catalytic behavior is increased if materials are combined in some way [3,4]. Several methods have been developed to synthesize monometallic and bimetallic nanoparticles in order to control size, shape, composition, interfacial interactions, etc., to make them useful in applications such as catalysis [5,6,7]. In this work we have prepared gold-silver (AuAg), gold-copper (AuCu) and silver-copper (AgCu) nanoparticles as potential systems for catalytic applications in water remediation. The bimetallic nanoparticles were characterized by Transmission Electron Microscopy (TEM) and UV-Vis spectroscopy. The AuAg nanoparticles were incorporated in mesoporous silica in order to create a composite material suitable for the catalytic degradation of water pollutants.
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