Study on Ag 2 WO 4 /g-C 3 N 4 Nanotubes as an Efficient Photocatalyst for Degradation of Rhodamine B
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Study on Ag2WO4/g‑C3N4 Nanotubes as an Efficient Photocatalyst for Degradation of Rhodamine B Hui Wang1 · Jia‑Rui Zhang1,2 · Xiang‑Feng Wu1 · Chao Wang1 · Yan Li1 · Li‑Jie Ci3,4 · Yun‑Ning Jia1 · Tian‑Long Chang1 · Xu‑Tao Liu1 · Yun‑Xuan Fu1 Received: 10 March 2020 / Accepted: 12 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Ag2WO4 is a typically noble metal based photocatalyst with highly efficient photocatalytic activity. However, due to photocorrosion, the pristine A g2WO4 is prone to inactivation during illumination. Constructing composite photocatalyst may be a useful method to promote the stability of Ag2WO4. In this work, Ag2WO4/graphitic carbon nitride nanotubes (g-C3N4 NTs) composite photocatalyst was prepared by adopting an in-situ composite strategy. The photocatalytic performance of the samples was discussed by the degradation of rhodamine B under visible light, and the catalytic mechanism was also analyzed. The characterization results show that the photocatalytic efficiency of the as-prepared Ag2WO4/g-C3N4 NTs composite increases firstly and then decreases along with the increase of the A g2WO4 content. When the theoretical molar ratio of Ag2WO4:g-C3N4 NTs reaches 3:2, the photocatalytic degradation efficiency achieves the optimal value, that is 92.4% within 20 min, which obviously exceeds 2.8% of pure A g2WO4 and 48.9% of pure g-C3N4 NTs. Moreover, the separation and migration efficiency of photoelectron–hole pairs of the composites can be accelerated in comparison with pure samples. In addition, superoxide radicals and hydroxyl radicals play major roles in the photocatalytic degradation process. Keywords g-C3N4 · Ag2WO4 · Composites · Photocatalysis
1 Introduction In recent years, textile industry plays an important role on increasing gross domestic products in China and some other developing countries. However, nearly 200,000 tons of synthetic organic dyes have been discharged into the environment, which caused serious water pollution and then plagued human’s life [1]. Therefore, it is urgently required to develop * Xiang‑Feng Wu [email protected] 1
School of Materials Science and Engineering, Hebei Key Laboratory of Advanced Materials for Transportation Engineering and Environment, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
2
Tianjin Key Laboratory of Building Green Functional Materials, Tianjin Chengjian University, Tianjin 300384, China
3
College of Chemical Engineering, Shijiazhuang University, Shijiazhuang 050035, China
4
The Technology Innovation Center of Shijiazhuang Green Decorative Plate Materials, Shijiazhuang 050035, China
some new and feasible routes to solve this issue [2–9]. Photocatalysis is deemed as an advanced environmental decontamination and energy conversion technique that uses the continual natural solar energy with rationally designed semiconductors. During the past decades, a number of photocatalysts, such as ZnO [10–13], TiO2 [14–17], and CdS [18–21], were reported for lig
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