Mechanisms of dyes adsorption on titanium oxide– graphene oxide nanocomposites |
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| Affiliation: | 1. Programa de Nanociencias y Nanotecnología, CINVESTAV- IPN, Av. IPN 2508 Col. San Pedro Zacatenco, 07360, Ciudad de, Mexico;2. Institute of Molecules & Materials of Le Mans (IMMM) - UMR CNRS 6283, Le Mans Université, 72000, Le Mans, France;3. Departamento de Ingeniería Eléctrica (SEES), CINVESTAV- IPN, Av. IPN 2508 Col. San Pedro Zacatenco, 07360, Ciudad de, Mexico;4. J. Mike Walker ‘66 Department of Mechanical Engineering, Texas A&M University, College Station, TX, 77843, USA;1. Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province, Kunming University of Science and Technology, Kunming, 650093, China;2. National Engineering Research Center of Vacuum Metallurgy, Kunming University of Science and Technology, Kunming, 650093, China;3. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, China;4. Fachgebiet Angewandte Nanophysik, Institut für Physik & ZMN MacroNano (ZIK), Technische Universität Ilmenau, Ilmenau, 98693, Germany;1. São Paulo State University (UNESP), School of Engineering of Guaratinguetá, Av. Dr. Ariberto Pereira da Cunha 333, Portal das Colinas, 12.516-410, Guaratinguetá, São Paulo, Brazil;2. Federal University of ABC (UFABC), Center for Engineering, Modeling and Applied Social Sciences, Av. Dos Estados, 5001, 09210-580, Santo André, SP, Brazil;3. Federal University of São Carlos (UFSCar), 13565-905, São Carlos, SP, Brazil;4. University of Mar del Plata (UNMdP), Institute of Materials Science and Technology (INTEMA), National Research Council (CONICET), Av. Juan B. Justo 4302, 7600, Mar del Plata, Argentina;1. Department of Physics, Faculty of Science, Beirut Arab University, P.O. Box 11–5020 Riad El Solh, Beirut, Lebanon;2. Department of Physics, Faculty of Science, Alexandria University, Alexandria, 21511, Egypt;1. Department of Electrical Engineering (SEES), Centro de Investigación y de Estudios Avanzados del IPN (CINVESTAV-IPN), Av. Instituto Politécnico Nacional 2508, C.P. 07360 Ciudad de México, México;2. CONACYT, Universidad de Ciencias y Artes de Chiapas, Instituto de Investigación e Innovación en Energías Renovables, Libramiento Norte 1150, CP 29039 Chiapas, México;3. Programa de Nanociencias y Nanotecnología, CINVESTAV, IPN, Av. IPN 2508, C.P. 07360 Ciudad de México, México;4. Institute of Molecular and Materials of Le Mans e UMR-CNRS 6283, Le Mans Université, 70285 Le Mans, France;5. Mike Walker ‘66 Department of Mechanical Engineering, Texas A&M University, 13 College Station, TX 77843, USA |
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| Abstract: | Graphene oxides (GOs), synthesized with different oxidation degrees and associated with Titanium dioxide (TiO2) nanoparticles show efficient adsorption processes for dye molecules in solution. The structural, morphology, electronic and optical features of the nanocomposites were investigated by dedicated methods. Water remediation was investigated through the adsorption efficiency of methylene blue (MB) dye as a function of the nanocomposites concentration from 1 to 5 g/L in solutions. While pristine TiO2 showed a maximum removal of ～44%, the incorporation of the GO ensures the fast and complete elimination of MB within 9 min. The ball milling process contributed to the increase in the number of defects and surface area in the nanocomposites, which was demonstrated by ID/IG ratios by Raman spectroscopy and surface areas by BET. Pseudo-second-order and mechanistic kinetic models were considered, and the performed analysis points out the relevance of the pseudo-second-order model to account for the adsorption kinetics. The Langmuir and Freundlich isotherm models were applied to the experimental data to find an adequate model to describe the adsorption equilibrium, as well as the intra-particle diffusion model during the different adsorption stages involved in the TiO2/GO nanocomposites. The role of the oxidation degree of GO was clarified through their respective efficiency in the removal of the dyes. |
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| Keywords: | Graphene oxide Methylene blue Nanocomposites Adsorption Kinetics |
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