Graphene oxide and graphitic carbon nitride nanocomposites assembled by electrostatic attraction forces: Synthesis and characterization

0505280 - ÚACH 2020 RIV CH eng J - Journal Article
Svoboda, L. - Škuta, R. - Matějka, V. - Dvorský, R. - Matýsek, D. - Henych, Jiří - Mančík, P. - Praus, P.
Graphene oxide and graphitic carbon nitride nanocomposites assembled by electrostatic attraction forces: Synthesis and characterization.
Materials Chemistry and Physics. Roč. 228, APR (2019), s. 228-236. ISSN 0254-0584. E-ISSN 1879-3312
Institutional support: RVO:61388980
Keywords : Exfoliated graphitic carbon nitride * Graphene oxide * Electrostatic attraction forces * Photocatalysis * Indigo carmine
OECD category: Inorganic and nuclear chemistry
Impact factor: 3.408, year: 2019
Method of publishing: Open access with time embargo

Photocatalytically active nanocomposites based on exfoliated at 550 degrees C graphitic carbon nitride nanosheets (NS) modified by graphene oxide (GO) were synthesized taking the advantage of electrostatic attraction forces originating between oppositely charged NS and GO nanosheets. The process was based on mixing of aqueous suspensions of GO and NS, both having pH = 3, with the aim to set the negative surface charge to GO and positive charge to NS. High resolution scanning electron microscopy (HRSEM) and S/TEM with elemental mapping revealed that GO was surrounded by exfoliated carbon nitride and thus large number of heterojunctions was created. Photoluminescence spectroscopy (PL) confirmed that the separation efficiency of photogenerated electrons and holes was more intense in GO/NS. Photocatalysis was used as a characterization method and indicated created heterojunction between GO and NS. The improved GO/NS photocatalytic degradation activity against the indigo carmine (IC) dye was observed as a result of higher production of superoxide radicals.
Permanent Link: http://hdl.handle.net/11104/0296754