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Efficient photocatalytic performance of direct Z-scheme photocatalyst Bi3TaO7/Mn0.5Cd0.5S for levofloxacin degradation under visible light irradiation.
- Source :
- Journal of Environmental Chemical Engineering; Jun2022, Vol. 10 Issue 3, pN.PAG-N.PAG, 1p
- Publication Year :
- 2022
-
Abstract
- The direct Z-scheme Bi 3 TaO 7 /Mn 0.5 Cd 0.5 S (MCS) composite photocatalyst was successfully constructed by an in-situ growth method. The performance for levofloxacin degradation by the composite catalysts under visible light irradiation was studied. The k value of BMCS-3 is the highest (0.05813 min<superscript>−1</superscript>), which is 3.1 times larger than that of BTO (0.01846 min<superscript>−1</superscript>) and 7.0 times larger than that of pure MCS (0.00825 min<superscript>−1</superscript>). The photocurrent (PC), photoluminescence (PL) spectroscopy and electrochemical impedance spectroscopy (EIS) suggested that the migration rate of photogenerated electrons and holes were greatly improved after the combination of Bi 3 TaO 7 and Mn 0.5 Cd 0.5 S. On one hand, the separation efficiency of photogenerated electron-hole pairs of the composite material was improved due to the formation of Z-scheme heterojunction. On the other hand, the redox ability of photogenerated electron-hole pairs was maintained, which helped the composite material to exhibit enhanced photocatalytic performance. Meanwhile, the possible pathways of levofloxacin degradation and the toxicity of the produced intermediates were investigated. [Display omitted] • Novel Z-scheme Bi 3 TaO 7 /Mn 0.5 Cd 0.5 S composite photocatalysts were synthesized. • The photocatalyst exhibited high performance for the degradation of levofloxacin. • The rate constant improved by a factor of 3.1 and 7.0 compared to Bi 3 TaO 7 and Mn 0.5 Cd 0.5 S. • The mechanism on the enhanced performance was discussed deeply. • The deductive degradation pathway of levofloxacin was also proposed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 22133437
- Volume :
- 10
- Issue :
- 3
- Database :
- Supplemental Index
- Journal :
- Journal of Environmental Chemical Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 157692300
- Full Text :
- https://doi.org/10.1016/j.jece.2022.107484