Effect of morphology transformation on photocatalytic performance of CdS crystal
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Effect of morphology transformation on photocatalytic performance of CdS crystal Yang Tan1, Zheng Zhang1, Fuqiang Guo1,* , Renqing Guo2,*, Haineng Bai3,*, Baohua Zhang1, Xin Li1, Qian Yang1, and Xuebo Liu1 1
Department of Physics, Changji University, Changji 831100, China Department of Materials Engineering, Taizhou University, Taizhou 318000, China 3 National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China 2
Received: 8 September 2020
ABSTRACT
Accepted: 24 September 2020
In this study, multi-shaped CdS was synthesized by hydro- and solvothermal methods. Interestingly, the results of scanning electron microscopy and transmission electron microscopy showed that branch-like CdS could be transformed into ball-like and flake-like in deionized water by ethylenediaminetetraacetic acid and L-cysteine, respectively, and the growth mechanism of CdS was discussed and explored: the ion-binding rate might be the main factor for the morphology transformation of CdS. X-ray diffraction and energy dispersive spectroscopy revealed branch-like CdS which exhibited the hexagonal phase. Besides, the optical characteristics of CdS were performed by ultraviolet–visible and photoluminescence spectrum. Also, CdS was utilized to explore the photocatalytic activity of rhodamine B, and the result showed that the photocatalytic activity of ball-like CdS was higher than flake-like and branch-like CdS.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction With the development of urbanization and industrialization, many organic pollutants were released into natural water, resulting in severe pollution of the water ecosystem and significant impact of human health [1]. The semiconductor materials can be invoked as the main photocatalyst to degrade organic pollutants due to the advantages of an adjustable band gap and a heterogeneous reaction
system, and it has become one of the most potential material for purifying environment [2–4]. However, metal sulfides have been demonstrated to be excellent semiconductor material for photocatalysis because of excellent photosensitivity [5, 6]. Cadmium sulfide (CdS, band gap: 2.42 eV), a metal sulfide, had good photoelectric effect and adequate electron mobility [7]. However, CdS had severe photo-corrosion and photocarrier recombination, which led to the reduction of photocatalytic efficiency. Therefore, morphology control was regarded
Yang Tan and Zheng Zhang contributed equally to this work.
Address correspondence to E-mail: [email protected]; [email protected]; [email protected]
https://doi.org/10.1007/s10854-020-04551-9
J Mater Sci: Mater Electron
as an effective method to enhance the photocatalytic activity of CdS [8]. At present, there are many methods to synthesize CdS such as hydro- and solvothermal [9], template [10], and sol-gel [11]. Besides, flower-like [12], rod-like [13], and linear-like [14] CdS can be synthesized by these methods. An et al. [15] have prepared pencil-like CdS nanorods and improved photocatalytic perf
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