Preparation of 3D flower-like Bi/CuS composite and properties of degrading dye wastewater
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Preparation of 3D flower-like Bi/CuS composite and properties of degrading dye wastewater Jie Zhu1 · Yi Zhou1 · Wan Wu1 · Yuehong Deng1 · Ye Xiang1 · Yi. Zhou1 Received: 12 September 2019 / Accepted: 16 January 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract At present, the combination of plasmonic metals and semiconductor materials is an effective method to improve the photocatalytic activity. In this paper, Bi was successfully compounded on the surface of 3D flower-like CuS by a simple two-step hydrothermal method. The samples were characterized by XRD, SEM, TEM, BET, XPS, EIS and M-S. The photocatalytic performance of Bi/CuS composites was evaluated by photocatalytic degradation of methylene blue (MB) and methyl orange (MO) under light illumination. The experimental results indicated that the combination of Bi nanoparticles improved the photocatalytic activity to MB and MO of the composites, which were 45.81% and 55.63% than that of pure CuS. In addition, the reaction mechanism in the photocatalytic degradation process was clarified, and the photocatalytic activity enhancement was attributed to the effective separation of photogenerated carriers and the reduction of recombination of photogenerated electron-hole pairs.
1 Introduction In recent years, with the rapid development of the world’s dyeing industry technology, dye wastewater is considered to be an intractable industrial problem due to its color depth and biotoxicity [1–3], which seriously threatens the stability and sustainable development of the ecological environment. Therefore, many methods such as activated carbon adsorption [4], ion exchange [5], electrochemical oxidation [6] and biological treatment [7] are widely used to remove contaminants from water. However, these methods do not completely remove contaminants. Photocatalysts that utilize sustainable solar energy are one of the ideal ways to remove water contaminants compared to these treatments. It has been reported that T iO2 can produce H 2 [8] by decomposing water under ultraviolet light irradiation, and more and more photocatalysts have entered the research field of researchers since 1972. For example, metal oxide semiconductor Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10854-020-02919-5) contains supplementary material, which is available to authorized users. * Yi Zhou [email protected]; [email protected] 1
School of Chemistry and Food Engineering, Changsha University of Science and Technology, Changsha 410114, People’s Republic of China
materials such as TiO2 [9], ZnO [10], and S nO2 [11], metal sulfide materials CdS [12], M oS 2 [13], and CuS [14]. Among them, T iO2 is most widely used because of its good chemical stability, non-toxicity and low cost benefits, but its wide bandgap can only use UV light to severely limit the application range [15]. Therefore, the search for visible light-driven photocatalyst has become a research hotspot. Metal sulfides have attracted much attent
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