Abstract
A sustainable supply of pure water is a great challenge in most developing and third-world countries. Nanomaterial-based technology offers technological development for wastewater purification. Nanocatalysis hydrogenation of nitroarene and dye molecules is a hot model in many research fields. Herein, we report eco-friendly and facile technology to synthesize Ag-Au bimetallic nanocomposites. The synthesized nanocomposites are characterized by ultraviolet–visible spectroscopy, Fourier-transform infrared spectroscopy, X-ray diffraction, field emission scanning electron microscopy and high-resolution transmission electron microscopy. The synthesized nanocomposite can efficiently degrade Congo red and 4-nitrophenol in water and in the presence of sodium borohydride. The results show that it degrades Congo red and 4-nitrophenol entirely within 6 and 7 min, respectively. These results could be useful for the green synthesis of Ag-Au bimetallic nanocomposites and help to remove organic dye molecules and nitroaromatics from wastewater.
Highlights
Aromatic compounds that contain a benzene ring, one or more hydroxyl group(s), one or more nitro group(s) and one or more azo bond(s) are toxic to the environment [1].Nitrophenol compounds have broad industrial applications in dye, herbicide, pesticides, drugs and explosives [2]
Chloroauric acid tetrahydrate (HAuCl4 ·4H2O), silver nitrate (AgNO3), sodium borohydride (NaBH4), 4-nitrophenol and Congo red dye were purchased from Sigma-Aldrich Chemicals
The catalyst obtained in and 4-nitrophenol was this studied basedused on previous studies [32]. reactions, The catalyst obtained incycles, it still obtained study in the hydrogenation andcycles, after four this studyinwas used in was the hydrogenation reactions, and after four it still displayed displayed activity. reactions, These results indicate theitgreen synthesis of Ag-Au this study was used in significant the hydrogenation and after fourthat cycles, still displayed significant activity
Summary
Aromatic compounds that contain a benzene ring, one or more hydroxyl group(s), one or more nitro group(s) and one or more azo bond(s) are toxic to the environment [1]. Different researchers have applied various catalytic systems for rapid hydrogenation of 4-nitrophenol and azo dye molecules in the last decade [20]. The green synthesis of gold and silver nanoparticles using the most commonly available tea leaves extract is reported [28,29]. Tripathy et al reported on the synthesis of Ag-Au bimetallic nanocomposites using a biodegradable synthetic graft copolymer, hydroxyethyl starch-g-poly (acrylamide-coacrylic acid), as well as the study of their catalytic activities [32]. The synthesis of Ag-Au bimetallic nanocomposites using waste tea leaf extract is of interest in this paper. The synthesis of Ag-Au bimetallic nanoparticles/nanocomposites using waste tea leaf extract has not yet been reported. We report an easy and facile synthesis approach of Ag-Au bimetallic nanocomposites using waste tea leaves extract to perform catalytic hydrogenation reaction of. 4-nitrophenol (4-NP) and Congo red (CR) dye molecules in water
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