Hydrothermal synthesis of a two-dimensional g-C<inf>3</inf>N<inf>4</inf>/MoS<inf>2</inf>/MnOOH composite material and its potential application as photocatalyst

Kristel Yurien Jiménez-Rangel, Luis Lartundo-Rojas, Alejandra García-García, Sandra Cipagauta-Díaz, Angeles Mantilla, José Enrique Samaniego-Benítez

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6 Scopus citations

Abstract

© 2019 Society of Chemical Industry BACKGROUND: Environmental pollution and energy crisis are nowadays considered among the most important problems facing humanity. Several strategies have been proposed to solve them, being photocatalysis a very promising one because of its ease of application and low cost. In the search for active photocatalysts, those based on graphite-like carbon nitride (g-C3N4) are becoming good alternatives for various reactions. In this work, the properties of g-C3N4/MoS2/MnOOH composite material and its photocatalytic behavior for the production of hydrogen (H2) under UV radiation were investigated. RESULTS: The composite material was synthesized by applying a combination of thermal condensation and hydrothermal methods. According to the results of X-ray diffraction (XRD), ultraviolet diffuse reflectance spectroscopy (UV-DRS), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM), good dispersion of the phases and the formation of a heterojunction were observed. The band gap value of the composite material, calculated by the Kubelka–Munk equation using the values obtained from UV-DRS analysis, was lower than those of the individual components, while it also had a much longer electron–hole recombination time, according to photoluminescence analysis. As a consequence of a synergistic effect, the activity of the proposed composite photocatalyst was superior in the reaction of water splitting, with a kinetic constant of 466 μmol h−1 and a production rate of 1750 μmol H2 g−1cat h−1 (50 and 21% higher than those obtained with MoS2 and g-C3N4, respectively). CONCLUSION: Because of its high activity and stability, g-C3N4/MoS2/MnOOH composite photocatalyst is an excellent alternative for H2 production by the water splitting reaction. © 2019 Society of Chemical Industry.
Original languageAmerican English
Pages (from-to)3447-3456
Number of pages10
JournalJournal of Chemical Technology and Biotechnology
DOIs
StatePublished - 1 Nov 2019

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