A comparison study of the photocatalytic mechanism and performance of Bi2S3-based binary composite (Cu2O/Bi2S3) and ternary composite (NH2-UiO-66/BiOBr/Bi2S3) photocatalyst for tetracycline degradation under visible-light irradiation

To study the degradation of tetracycline by Bi 2 S 3 -based binary composite and ternary composite photocatalysts, Cu 2 O/Bi 2 S 3 and NH 2 -UiO-66/BiOBr/Bi 2 S 3 was successfully fabricated by the solvothermal method, which can effectively and stably degrade tetracycline (TC). The crystal structure...

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Bibliographic Details
Published in:International journal of environmental analytical chemistry 2023-12, Vol.ahead-of-print (ahead-of-print), p.1-18
Main Authors: Peng, Lin, Zhang, Rui, Lei, Qun, Luo, Jianhui
Format: Article
Language:English
Subjects:
Bismuth sulfides
Chemical composition
Copper oxides
Crystal structure
Cu2O/Bi2S3
Degradation
Electromagnetic absorption
Electron microscopy
Free radicals
Hydrogen
Irradiation
Light absorption
Light irradiation
nanomaterial
NH2-UiO-66/BiOBr/Bi2S3
Photocatalysis
Photocatalyst
Photocatalysts
Photodegradation
Photoelectric effect
Photoelectric properties
Photoelectricity
Radiation
Scanning electron microscopy
tetracycline degradation
X-ray diffraction
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Summary:To study the degradation of tetracycline by Bi 2 S 3 -based binary composite and ternary composite photocatalysts, Cu 2 O/Bi 2 S 3 and NH 2 -UiO-66/BiOBr/Bi 2 S 3 was successfully fabricated by the solvothermal method, which can effectively and stably degrade tetracycline (TC). The crystal structure, chemical composition, and microscopic morphology of the as-prepared sample were analysed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The photocatalytic performance of the composite photocatalyst was estimated by degradation of TC under visible-light irradiation. The results showed that the removal ratio of TC by Cu 2 O/Bi 2 S 3 and NH 2 -UiO-66/BiOBr/Bi 2 S 3 are 95.2% and 93.2%, respectively. The photoelectric properties of the material were evaluated by PL and EIS analysis, and compared to Bi 2 S 3 , the overall visible light absorption capacity, as well as the separation and transfer rates of photogenerated carriers of the composites photocatalyst have been significantly improved. Both Cu 2 O/Bi 2 S 3 and NH 2 -UiO-66/BiOBr/Bi 2 S 3 can achieve a good photodegradation performance for TC, but the results of UV-vis DRS spectrum, Mott-Schottky curve, and free radical trapping experiments show that their photodegradation mechanism for TC is different. For Cu 2 O/Bi 2 S 3 , *O 2 − and h + are the main active species in the photocatalytic reaction process, among which *O 2 − plays the most important role, but *OH has almost no effect, and for NH 2 -UiO-66/BiOBr/Bi 2 S 3 , the main active species are *OH and h + . The possible photocatalytic mechanisms for Cu 2 O/Bi 2 S 3 and NH 2 -UiO-66/BiOBr/Bi 2 S 3 are Z-scheme and double Z-schemes are proposed, respectively.
ISSN:0306-7319
1029-0397
DOI:10.1080/03067319.2021.1972100