Novel siligraphene/g-C 3 N 4 composites with enhanced visible light photocatalytic degradations of dyes and drugs
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RESEARCH ARTICLE
Novel siligraphene/g-C3N4 composites with enhanced visible light photocatalytic degradations of dyes and drugs Somayeh Darvishi-Farash 1 & Maryam Afsharpour 1
&
Javad Heidarian 2
Received: 23 April 2020 / Accepted: 21 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this research, a novel graphene-like SiC (siligraphene) was synthesized using a natural precursor and used to improve the photocatalytic activity of g-C3N4. The synthesized siligraphene has shown an excellent photocatalytic property due to its low band-gap and graphene-like structure which increases the electron transfer and reduces the electron-hole recombination rate and can improve the photocatalytic activity. Also, the positive charged Si atoms in siligraphene structure can adsorb oxygen to produce radicals that can promote the oxidation reaction. However, commercial β-SiC has exhibited very poor photocatalytic properties. As we know, g-C3N4 is a potential material for photocatalytic applications. Here, the novel siligraphene/g-C3N4 composites were successfully synthesized to enhance the photocatalytic properties of g-C3N4 in the degradation of model dyes (Congo red, Methyl red, and Methyl orange) and model drugs (Acetaminophen and Tetracycline) under visible light irradiation. Results show that siligraphene/g-C3N4 composite exhibits much better photocatalytic properties than pure g-C3N4. This enhanced photocatalytic properties can be justified by the enlarged surface area, suitable band gap, excellent electron properties, appropriate surface charge, and efficient migration of electron in siligraphene/g-C3N4 composite. Keywords Siligraphene . Graphene-like SiC . g-C3N4 . Photocatalyst . Visible light . Dye . Drug
Introduction Carbon nitride (g-C3N4) is a famous metal-free photocatalyst which can be synthesized by pyrolysis of nitrogen-rich precursors (Kumar et al. 2020; Martín-Ramosa et al. 2015; Mo et al. 2015; Xu et al. 2020; Zhang et al. 2010). Layered carbon nitride possesses large surface area, appropriate band gap, and high thermal and chemical stabilities which considered it a potential material for photocatalytic applications such as hydrogen generation, CO2 reduction, and degradation of organic Responsible editor: Sami Rtimi Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-10969-9) contains supplementary material, which is available to authorized users. * Maryam Afsharpour [email protected] 1
Department of Inorganic Chemistry, Chemistry & Chemical Engineering Research Center of Iran, Tehran 14335-186, Iran
2
Nanotechnology Research Center, Research Institute of Petroleum Industry (RIPI), Tehran 1485733111, Iran
pollutants (Akple et al. 2020; Gu et al. 2020; Wang et al. 2012a, b, 2018a, b). However, its fast electron-hole recombination and insufficient visible light absorption are some of its shortcomings that need further improvement to promote its catalytic activity (Li et al. 2019, 2020; Zheng et al. 2012). Many
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