Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 29, Issue 56, Pages 85510-85524Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-022-21758-x
Keywords
TiO2/ZnO; Heterostructure; Photocatalytic; Degradation; Dissolved organic matter; Landfill leachate
Categories
Funding
- National Natural Science Foundation of China [51767021]
- Research and Development Program in Key areas of Guangdong Province, China [2019B090913002]
- Education Department youth project of Hunan Province, China [21B0711]
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TiO2/ZnO heterostructural composite powders were fabricated using hydrothermal synthesis and solid-state reaction method. The TiO2/ZnO catalysts showed high degradation efficiency for methylene blue and dissolved organic matter. The effective separation of electron and hole in the TiO2/ZnO photocatalyst was identified as the main reason for its high degradation efficiency.
In order to investigate the photocatalytic degradation of dissolved organic matter (DOM) in landfill leachate, TiO2/ZnO heterostructural composite powders were fabricated combining with hydrothermal synthesis and solid-state reaction method. The prepared TiO2/ZnO composite powders consist of anatase TiO2 nanoparticles distributing on the surface of wurtzite ZnO particles. The optical band gap of TiO2/ZnO powder is less than that of pure ZnO or TiO2 powder. TiO2/ZnO catalyzers show high ultraviolet-degradation efficiency for methylene blue and dissolved organic matter. The degradation rate of TiO2/ZnO powder for fulvic acid-like substances in landfill leachate is 2.99 times that of pure ZnO powder, and is 1.30 times that of pure TiO2 powder. The degradation of fulvic acid-like substances by TiO2/ZnO photocatalyst reduced some molecular weight of benzene ring structure substances in leachate. The effective separation of electron and hole in heterostructural TiO2/ZnO photocatalyst is the main reason for its high photocatalytic degradation efficiency of DOM in landfill leachate.
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