Synthesis of Bi 2 WO 6 @NH 2 -MIL-125(Ti): A S-Scheme Photocatalyst with Enhanced Visible Light Catalytic Activity
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Synthesis of Bi2WO6@NH2‑MIL‑125(Ti): A S‑Scheme Photocatalyst with Enhanced Visible Light Catalytic Activity Yifeng Xu1 · Yi Zhou1 · Yuehong Deng1 · Ye Xiang1 · Yawen Tan1 · Haiqin Tang1 · Hao Zou1 Received: 9 March 2020 / Accepted: 7 May 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this work, a novel S-scheme Bi2WO6@NH2-MIL-125(Ti) heterojunction composite was synthesized for the first time by a secondary hydrothermal method. XRD, SEM, TEM, XPS and DRS were used to characterize the Bi2WO6@NH2-MIL-125 (Ti) composite. The results show that NH2-MIL-125(Ti) is embedded between Bi2WO6 nanosheets, the composite materials have narrower bandgap and enhanced absorption of visible light. The recombination tendency of electron–hole pairs were also weakened by the S-scheme heterojunction between the two monomers. The best content of NH2-MIL-125(Ti) was 13 wt%, the degradation rate of RhB reached 98% in 50 min, which was 5 times and 18 times that of the Bi2WO6 and NH2-MIL-125 (Ti) respectively. After several cycles under visible light, the composite materials still have good degradation rate and excellent stability, indicating that these composite materials have great development potential in the environmental field. Graphic Abstract
Keywords Bi2WO6 · NH2-MIL-125 (ti) · S-scheme heterojunction · Visible light
1 Introduction
* 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
In terms of environmental pollution control, chemicallyassisted synthesis, and hydrogen production by photolysis of water, photocatalysis has become a very reliable method [1–3]. However, because of the gap width, traditional semiconductors (for instance T iO2 [4] and ZnO [5]), can only respond to ultraviolet light. However, in the full solar spectrum, UV light only accounts for 4% which
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resulted in underutilization of solar energy. Therefore, how to extend the absorption range of the semiconductor to the visible light region is of great significance for the practical application of photocatalysis. Among the visible-lightdriven photocatalysis that have been developed, B i2WO6 with special characteristics such as thermoelectricity and nonlinear dielectric sensitivity has received wide attention [6]. Because there is a corner-sharing structure of [WO4]2− octahedron between the (Bi2O2)2+ layer, the electrons in B i2WO6 can be quickly transferred to the photocatalyst surface along the layered network, and the recombination with holes is suppressed by electron transport [7]. However, even in this case, the photogenerated carriers of Bi2WO6 in the excited state are still unstable and tend to recombine, which is far from being a satisfactory photocatalyst [8, 9]. In order to improve its photocatalytic activity, constructing heterojunctions is the most commonly used method and means. Samran et al. [10]. prepared a BiFeO3/Bi2WO6 composite pho
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