首页|Prominent dual Z-scheme mechanism on phase junction WO3/CdS for enhanced visible-light-responsive photocatalytic performance on imidacloprid degradation
Prominent dual Z-scheme mechanism on phase junction WO3/CdS for enhanced visible-light-responsive photocatalytic performance on imidacloprid degradation
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NSTL
Elsevier
The construction of dual Z-scheme photocatalysts is an effective way to promote the separation and migration of electrons-holes as well as retain their high redox abilities. Herein, a distinctive dual Z-scheme photocatalyst based on phase junction WO3 and CdS (CW) was successfully fabricated via hydrothermal method and in-situ precipitation process. The as-prepared materials showed the advantages of both phase junction and dual Z-scheme mechanism (promoted utilization of carriers and improved redox potential). As a result, the k(app) value of 75CW (0.05237 min(-1)) was 29.8 times that of phase junction WO3 (0.00176 min(-1)) and 2.9 times that of CdS (0.01799 min(-1)) in terms of imidacloprid (IMD) degradation. Trapping experiment and electron spin resonance (ESR) proved the dual Z-scheme mechanism, the key to significantly improve photocatalytic degradation efficiency of WO3/CdS nanocomposites. Combined the analysis of liquid chromatography-mass spectrometry (LC-MS) with density functional theory (DFT) calculation, rational degradation pathways of IMD were put forward in detail. This work is excepted to provide new horizons for the construction of dual Z-scheme system with phase junction and the photodegradation of IMD.
NSTL
Elsevier
