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Synthesis of novel ternary Bi2WO6/CeO2/g-C3N4 composites with enhanced visible light photocatalytic activity for removal of organic and Cr(VI) from wastewater

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Abstract

In this study, novel ternary Bi2WO6/CeO2/g-C3N4 composites were synthesized successfully in this study, which exhibited enhanced visible-light photocatalytic activity for oxidization of rhodamine B (RhB) and tetracycline hydrochloride (TH) as well as reduction of Cr(VI). The characteristics of the as-prepared composites were investigated in detail by X-ray diffraction (XRD), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscopy (SEM), Fourier Transform Infrared spectra (FT-IR), UV–vis diffuse reflectance spectra (UV-DRS), Photoluminescence spectra (PL), Electrochemical Impedance Spectroscopy (EIS) and Mott-Schottky curves. The results demonstrated that the ternary heterojunctions were formed between Bi2WO6, CeO2 and g-C3N4, which can narrow the band gap to improve separation and migration of photogenerated electrons-hole pairs, so that the lifetimes of photogenerated charge carriers were prolonged to involve in photocatalytic reaction. Therefore, Bi2WO6/CeO2/g-C3N4 can generate abundant free radicals under visible-light irradiation to enhance photocatalytic activity. BW/Ce/g-3 can degrade 99.24% of RhB in 75 min and 54.76% of TH in 105 min. More than that, BW/Ce/g-3 exhibited enhanced photocatalytic reduction for Cr(VI) (94.85%, 30 min). Meanwhile, the best synthesized condition was determined that the adding amount of CeO2 was 0.043 g and g-C3N4 was 0.02 g. This study not only provided a mothed to synthesize Bi2WO6/CeO2/g-C3N4 ternary heterojunctions, but also confirmed a photocatalyst for degrading both organic pollution and heavy metals wastewater.

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Acknowledgements

The present work was financially supported by Outstanding Young Talents Fund Project of Jilin Provincial Department of Science and Technology in 2019 (20190103109JH); National key research and development program (2017YFD0300405-4).

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Author notes

  1. Yichen Bai and Tianye Wang contributed equally to this work and should be considered co-first authors.

Authors and Affiliations

  1. College of Resources and Environment, Jilin Agricultural University, Changchun, 130000, China

    Yichen Bai, Tianye Wang & Shuxia Liu

  2. Key Laboratory of Soil Resource Sustainable Utilization for Jilin Province Commodity Grain Bases, Changchun, 130118, China

    Yichen Bai, Tianye Wang & Shuxia Liu

  3. Guangdong Provincial Engineering Technology Research Center for Urban Water Cycle and Water Environment Safety, Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, China

    Xinyu Zhao & Wei Mao

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  1. Yichen Bai
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Bai, Y., Wang, T., Zhao, X. et al. Synthesis of novel ternary Bi2WO6/CeO2/g-C3N4 composites with enhanced visible light photocatalytic activity for removal of organic and Cr(VI) from wastewater. J Mater Sci: Mater Electron 31, 17524–17534 (2020). https://doi.org/10.1007/s10854-020-04308-4

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