Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 285, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2021.119877
Keywords
Z-scheme photocatalyst; Quantum effect; Photocatalytic disinfection; Photodegradation; CdTe quantum dots/Bi2WO6
Funding
- Science and Technology Service Program of Chinese Academy of Sciences [KFJ-STSQYZD-115]
- National Key R&D Program of China [2018YFD0300903-4]
- Key R&D Program of Ningxia Province [2018BBF02021]
- Science and Technology Major Project of Anhui Province [17030701029]
- Fundamental Research Funds for the Central Universities [2232020D-22]
- Open Research Fund of Key Laboratory of High Magnetic Field and Ion Beam Physical Biology
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A novel 0D/3D CdTe quantum dots/Bi2WO6 Z-scheme photocatalyst was designed to enhance photochemical energy conversion efficiency, exhibiting excellent performance in tetracycline removal and E. coli photoinactivation. The study proposed a Z-scheme heterojunction model through in-depth analysis of electron transfer and photocatalytic reaction pathways.
A novel 0D/3D CdTe quantum dots/Bi2WO6 (CTQDs/BWO) Z-scheme photocatalyst was designed to enhance photochemical energy conversion efficiency. Experimental results demonstrated that the CTQDs/BWO injected electron lifetime, interfacial carrier transfer efficiency, and visible light absorption ability were observably enhanced due to the quantum effect and Z-scheme heterojunction synergy. In particular, 1.0 % CTQDs/BWO displayed excellent tetracycline removal efficiency (91.45 %) and prominent E. coli photoinactivation under visible light. In addition, its tetracycline removal efficiency remained above 85 % after five cyclic experiments. Moreover, using density functional theory (DFT) calculations and LC-MS spectra, we deeply analyzed the photoinduced electron transfer pathways and photocatalytic reaction degradation pathways and proposed a Z-scheme heterojunction model. This work provides a novel strategy for designing efficient Z-scheme photo catalysts and exhibits promising prospects for utilizing photocatalysts to address water contaminants.
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