Fabrication and efficient photocatalytic dye degradation over Z-scheme-based BiVO 4 /CdS heterojunction under visible-li
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Fabrication and efficient photocatalytic dye degradation over Z‑scheme‑based BiVO4/CdS heterojunction under visible‑light irradiation Tongtong Zhang1 · Xiaohong Wang1 · Zhuo Sun1 · Qian Liang1 · Man Zhou1 · Song Xu1 · Zhongyu Li1,2,3,4 · Dazhi Sun4 Received: 6 April 2020 / Accepted: 29 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Novel Z-scheme-based B iVO4/CdS photocatalysts with efficient charge separation were prepared by simple in situ hydrothermal method. The compact structure of the CdS nanorod and B iVO4 nanosheet has formed a Z-scheme heterojunction. The as-prepared B iVO4/CdS composites were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, diffuse reflection spectroscopy, photoluminescence and photocurrent techniques. It was found that the B iVO4/CdS composites had the light-absorbing range and could efficiently degrade malachite green dye under visible-light irradiation. In this report, the result of the best degrading sample could achieve 92% in 30 min under visible light, respectively. BiVO4/CdS composites perform photocatalytic efficiently due to the Z-scheme. Furthermore, the Z-scheme-based BiVO4/CdS composites leaded to a major oxidation site at B iVO4, which successfully avoided photoetching of CdS during photocatalysis. Especially, the B iVO4/CdS system exhibits great photogenerated electron–hole pairs separation capabilities and high redox capabilities. This unique method of synthesizing Z-scheme-based BiVO4/CdS heterojunction has ability to reduce the cost and promote photocatalytic in visible-light range simultaneously.
1 Introduction In recent years, many advantages of semiconductor photocatalysts in materials, chemistry and environment have been widely developed by researchers [1–7]. Photocatalytic materials are used more and more widely, such as the production * Zhongyu Li [email protected] * Dazhi Sun [email protected] 1
Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, People’s Republic of China
2
School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, People’s Republic of China
3
Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou 213164, People’s Republic of China
4
School of Petrochemical Engineering, Jilin Institute of Chemical Technology, Jilin 132022, People’s Republic of China
of hydrogen (H2) in the energy industry and the reduction of carbon dioxide, as well as wastewater degradation treatment and air purification in environmental pollution control. However, these single semiconductor photocatalysts do not meet all the requirements of practical applications, such as efficient use of solar energy, safe reaction processes, efficient processing implementation, and high stability and low cost of photocatalysts [8–11]. In order to incr
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