Visible light photocatalytic activity of reduced graphene oxide synergistically enhanced by successive inclusion of γ-Fe2O3, TiO2, and Ag nanoparticles |
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| Affiliation: | 1. Department of Physics, International Islamic University, Islamabad, Pakistan;2. Laboratory of Nanoscience and Technology, Department of Physics, Quaid i Azam University, Islamabad, Pakistan;3. Institute of Biomedical and Genetic Engineering (IBGE), Islamabad, Pakistan;1. College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha 410082, PR China;2. China National Engineering Research Center for Agrochemicals, Hunan Research Institute of Chemical Industry, Changsha 410014, PR China;1. School of Chemistry and Chemical Engineering, School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, PR China;2. School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, PR China;1. Multidisciplinary Platform of Advanced Engineering, Chemical Engineering Discipline, School of Engineering, Monash University, Jalan Lagoon Selatan, 46150 Bandar Sunway, Selangor, Malaysia;2. Low Carbon Economy (LCE) Group, School of Chemical Engineering, Universiti Sains Malaysia, Engineering Campus, Seri Ampangan, 143000 Nibong Tebal, Pulau Pinang, Malaysia |
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| Abstract: | Novel magnetic nanocomposites are synthesized by loading reduced graphene oxide (r-GO) with three brands of nanoparticles consisting of titanium dioxide (TiO2), gamma-iron(III) oxide (γ-Fe2O3), and silver (Ag) with varying amounts. The resulting Ag/TiO2/γ-Fe2O3@r-GO demonstrates synergistically enhanced visible light photocatalytic activity, on degradation of wastewater?s toxic crystal violet (CV). Specifically, it exhibits higher photoactivity than those of neat graphene oxide (GO), TiO2@GO, γ-Fe2O3@GO, and TiO2/γ-Fe2O3@GO, possibly because of effective separation of photogenerated carriers via strongly coupled Ag/γ-Fe2O3@r-GO cocatalyst and the enrichment of organic molecules on the graphene nanosheets. A higher photocatalytic efficiency is observed when 11.5 wt% Ag nanoparticles are incorporated in TiO2/γ-Fe2O3@GO. After 3 successive cycles, the latter nanocomposite maintains 97% removal efficiency with excellent stability and easy recovery. Considering its facile preparation and high photocatalytic activity, it is hoped that this photocatalyst will find its application in various fields such as air purification and wastewater treatment. The structure and properties of Ag/TiO2/γ-Fe2O3@r-GO are characterized by Fourier-transform infrared (FTIR), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), ultraviolet–visible spectrometry (UV–vis) and Raman spectroscopy techniques. |
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| Keywords: | Graphene Crystal violet Ag Photocatalyst |
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