Sol-gel synthesis and characterization of Co 3 O 4 /CeO 2 nanocomposites and its application for photocatalytic discolor
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RESEARCH ARTICLE
Sol-gel synthesis and characterization of Co3O4/CeO2 nanocomposites and its application for photocatalytic discoloration of organic dye from aqueous solutions Mohammad Hassanpour 1 & Masoud Salavati-Niasari 1 & Hossein Safardoust-Hojaghan 1 Received: 14 May 2020 / Accepted: 28 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Herein, Co3O4/CeO2 nanocomposite was synthesized by the modified Pechini method. Citric, maleic, succinic, and trimsic acids were used as a stabilizer, and the variation affected the morphology and size of the synthesized nanocomposites. Subsequently, the formation of Co3O4/CeO2 nanocomposites was confirmed by various analyses. Furthermore, the particles were considered for size and morphology by SEM and HRTEM analyses, and the sample that used trimsic acid as the stabilizer was designated as the goal sample to continue the route. The optimum sample was used to investigate the photocatalytic properties of the synthesized nanocomposite. The UV-light photocatalyst test was performed in neutral, alkaline, and acidic states against two aqueous solutions containing color contamination of methylene blue and erythrosine B dyes. The results showed decolorization at 85% for methylene blue and 90% for erythrosine B over 120 min test time. Keywords Sol-gel . Co3O4/CeO2 . Nanocomposite . Photocatalyst . Water pollutants
Introduction Environmental pollution by various factors has involved much notice in recent decades and the pollution of aquatic environments due to the importance of water to humans has caused great concern in different societies (Khan and Malik 2019; Wutich 2019). Due to the importance of sanitizing water from the substances that cause it unhealthy, many researchers have attracted the attention of researchers to remove these contaminants in rapid and inexpensive methods (Fernández et al. 2016; Kumar Reddy and Lee 2012; Pradeep 2009; Qin et al. 2019). Nanosized materials, as a new group of materials that have been used extensively in the past decades due to their unique properties, are among the materials that are of interest to researchers working on water treatment (Ghasali et al. 2020; Karimi-Maleh et al. 2020a; Karimi-Maleh et al. 2020b; Orooji et al. 2019a, 2019b, 2019c; Santhosh et al. 2019; Sisi et al. 2020; Wang 2019; Arefi-Oskoui Responsible Editor: Sami Rtimi * Masoud Salavati-Niasari [email protected] 1
Institute of Nano Science and Nano Technology, University of Kashan, P.O. Box 87317-51167, Kashan, Islamic Rep, Iran
et al. 2019). The photocatalytic process on semiconductors materials is one of the paths that researchers take to remove organic compounds and some other water contaminants by nanomaterials (Belver et al. 2019; Ghasemi et al. 2020; Rad et al. 2020; Zhang et al. 2019). Metal oxide nanocomposites have semiconductor properties. These materials are among the most commonly used materials for the photocatalytic process (Alem et al. 2020; Boruah et al. 2019; Kumar and Rao 2017). Recently, mix metal oxides due t
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