兰州大学机构库
Rational construct CQDs/BiOCOOH/uCN photocatalyst with excellent photocatalytic performance for degradation of sulfathiazole
Hu, Zhongzheng; Xie, Xiaoyun; Li, Shan; Song, Mengxi; Liang, Guiwei; Zhao, Jing; Wang, Zhaowei
2021-01-15
Source PublicationChemical Engineering Journal
ISSN13858947
Volume404
AbstractThe novel heterojunction photocatalysts also known as carbon quantum dots-decorated BiOCOOH/ultrathin g-C3N4 nanosheets (CQDs/BiOCOOH/uCN) were designed, where carbon quantum dots (CQDs) acted as mediators to shuttle electrons between BiOCOOH and ultrathin g-C3N4 nanosheets (uCN). The physicochemical properties of as-obtained composites were systematically characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffractometry, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The 4-CQDs/BiOCOOH/uCN consisting of 50 wt% ultrathin g-C3N4 nanosheets (uCN) and 4 mL CQDs solution manifested the optimal photoactivity. After 90 min of LED lamp irradiation, the STZ degradation efficiency by 4-CQDs/BiOCOOH/uCN reached 99.28% ± 1.04, and the corresponding degree of mineralization was 49.58% ± 1.36. The enhanced photocatalytic performance of 4-CQDs/BiOCOOH/uCN was owing to the fast photogenerated charges transfer and separation revealed by photoluminescence (PL), transient photocurrent responses and electrochemical impedance spectra (EIS) measurements. By means of the radicals quenching experiments and electron spin resonance spectroscopy (ESR) analysis, it was demonstrated that •O2– and •OH were the dominant reactive species of STZ degradation. Besides, the effects of catalyst dosage (0.2–1.2 g/L), pH value (3.0–11.0), natural organic matter and different anions (Cl−, SO42−, NO3−) on the photocatalytic activity of 4-CQDs/BiOCOOH/uCN composite were systematically explored. 17 main intermediates were found based on high-resolution mass spectrometry (HRMS) detection. Eventually, the 4-CQDs/BiOCOOH/uCN composite showed favorable reusability in recycling experiments, and displayed satisfactory degradation abilities for STZ in deionized water (99.28% ± 1.04), tap water (97.15% ± 1.16), river water (96.44% ± 0.76), and wastewater treatment plant effluent (96.19% ± 1.20). © 2020 Elsevier B.V.
KeywordBismuth compounds Carbon Carbon Quantum Dots Degradation Deionized water Effluent treatment Effluents Electrons Fourier transform infrared spectroscopy Heterojunctions High resolution transmission electron microscopy Magnetic moments Mass spectrometry Nanocrystals Nanosheets Photocatalytic activity Physicochemical properties Reusability Scanning electron microscopy Semiconductor quantum dots Semiconductor quantum wells Sewage treatment plants Wastewater reclamation Wastewater treatment Water recycling X ray diffraction analysis X ray photoelectron spectroscopyDegradation efficiency Electrochemical impedance spectra High resolution mass spectrometry Natural organic matters Photocatalytic performance Recycling experiments Transient photocurrents Wastewater treatment plant effluent
PublisherElsevier B.V.
DOI10.1016/j.cej.2020.126541
Indexed ByEI
Language英语
EI Accession Number20203309042864
EI KeywordsElectron spin resonance spectroscopy
EI Classification Number445.1 Water Treatment Techniques ; 452 Municipal and Industrial Wastes ; Waste Treatment and Disposal ; 701.2 Magnetism: Basic Concepts and Phenomena ; 714.2 Semiconductor Devices and Integrated Circuits ; 741.3 Optical Devices and Systems ; 761 Nanotechnology ; 801 Chemistry ; 802.2 Chemical Reactions ; 804 Chemical Products Generally ; 933 Solid State Physics
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.lzu.edu.cn/handle/262010/440597
Collection兰州大学
Corresponding AuthorXie, Xiaoyun
AffiliationCollege of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, China
First Author AffilicationLanzhou University
Corresponding Author AffilicationLanzhou University
Recommended Citation
GB/T 7714
Hu, Zhongzheng,Xie, Xiaoyun,Li, Shan,et al. Rational construct CQDs/BiOCOOH/uCN photocatalyst with excellent photocatalytic performance for degradation of sulfathiazole[J]. Chemical Engineering Journal,2021,404.
APA Hu, Zhongzheng.,Xie, Xiaoyun.,Li, Shan.,Song, Mengxi.,Liang, Guiwei.,...&Wang, Zhaowei.(2021).Rational construct CQDs/BiOCOOH/uCN photocatalyst with excellent photocatalytic performance for degradation of sulfathiazole.Chemical Engineering Journal,404.
MLA Hu, Zhongzheng,et al."Rational construct CQDs/BiOCOOH/uCN photocatalyst with excellent photocatalytic performance for degradation of sulfathiazole".Chemical Engineering Journal 404(2021).
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