Cu 2 O/MoS 2 composites: a novel photocatalyst for photocatalytic degradation of organic dyes under visible light
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ORIGINAL PAPER
Cu2O/MoS2 composites: a novel photocatalyst for photocatalytic degradation of organic dyes under visible light Xuexin Zhang 1 & Mingzhu Xia 1 & Fengyun Wang 1 & Wu Lei 1 Received: 18 January 2020 / Revised: 2 August 2020 / Accepted: 22 August 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The novel nanocomposite Cu2O/MoS2-12 was synthesized by a simple two-step method. Cu2O nanospheres grow on the surface of MoS2 nanoflowers and have high photocatalytic activity. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM) X-ray photoelectron spectroscopy (XPS), ultraviolet-visible light (UV-vis) photoluminescence (PL) spectroscopy, UV-vis diffuse reflection (UV-DRS), and electrochemical impedance (EIS) were used to study the structure and properties of the samples. The photocatalytic properties of the materials were evaluated by degrading methyl orange (MO) under visible light. The results show that CM-12 can completely degrade MO in 30 min, and the pseudofirst-order kinetic constant of degradation is 8.76 times that of pure Cu2O, which can be attributed to the composite material that can greatly reduce the recombination rate of photogenerated electrons and holes, and it has good stability. After repeated use for 5 times, the degradation rate can still reach 40%. Through experiments and theoretical results, a possible photocatalytic mechanism is proposed. To the best of our knowledge, this work was the first example of combining MoS2 with Cu2O and applying it to photocatalytic degradation of organic pollutants. It was beneficial for developing new photocatalysts and improving the catalytic performance of conventional photocatalysts. Keywords Cu2O . Methyl orange . MoS2 . Nanocomposite . Photocatalyst
Introduction In recent years, the organic azo dye methyl orange (MO) has been widely used in textile, paper, leather, and other industries due to its bright color. At the same time, some methyl oranges are also left in various wastewaters, causing certain harm to the environment [1]. Therefore, a technology that uses sustainable solar energy to solve current energy and environmental problems (semiconductor photocatalytic technology) has received widespread attention [2–4]. Semiconductor photocatalytic technology decomposes pollutants by generating OH radicals and other oxidizing substances, and finally mineralizes them into harmless carbon dioxide and water [5–7].
* Mingzhu Xia [email protected] * Fengyun Wang [email protected] 1
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Cu2O is a photocatalyst with a bandgap of about 2.0 eV [8]. As a semiconductor photocatalytic material, it has the advantages of being non-toxic, easy to obtain raw materials, and degradable organic substances under visible light [9]. So far, different forms of Cu2O have been used in photocatalysis, such as cube [10], octahedron [11], and polyhedron [12]. However, the recombination of photogenerate
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