Synthesis of novel ternary Bi 2 WO 6 /CeO 2 /g-C 3 N 4 composites with enhanced visible light photocatalytic activity fo
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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 Yichen Bai1,2, Tianye Wang1,2, Xinyu Zhao3, Wei Mao3, and Shuxia Liu1,2,*
1
College of Resources and Environment, Jilin Agricultural University, Changchun 130000, China Key Laboratory of Soil Resource Sustainable Utilization for Jilin Province Commodity Grain Bases, Changchun 130118, China 3 Guangdong Provincial Engineering Technology Research Center for Urban Water Cycle and Water Environment Safety, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China 2
Received: 19 November 2019
ABSTRACT
Accepted: 21 August 2020
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
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Yichen Bai and Tianye Wang contributed equally to this work and should be considered co-first authors.
Address correspondence to E-mail: [email protected]
https://doi.org/10.1007/s10854-020-04308-4
J Mater Sci: Mater Electron
heterojunctions, but also confirmed a photocatalyst for degrading both organic pollution and heavy metals wastewater.
1 Introduction Treatments of dye wastewater and pharmaceutical wastewater are hard for traditional sewage treatment technology, because these kinds of organic contaminants are high molecular weight and trace amount in the environment [1, 2]. Not only that, heavy metals pollution always coexist in organic wastewater, such as Cr(VI), which is another crucial issue in sewage treatment technology [1]. This kind of heavy meta
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