|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|
|Source Publication||Chemical Engineering Journal
|Abstract||The 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.|
Carbon Quantum Dots
Fourier transform infrared spectroscopy
High resolution transmission electron microscopy
Scanning electron microscopy
Semiconductor quantum dots
Semiconductor quantum wells
Sewage treatment plants
X ray diffraction analysis
X ray photoelectron spectroscopyDegradation efficiency
Electrochemical impedance spectra
High resolution mass spectrometry
Natural organic matters
Wastewater treatment plant effluent
|EI Accession Number||20203309042864
|EI Keywords||Electron spin resonance spectroscopy
|EI Classification Number||445.1 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
|Corresponding Author||Xie, Xiaoyun|
|Affiliation||College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, China|
|First Author Affilication||Lanzhou University
|Corresponding Author Affilication||Lanzhou University
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.
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.
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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