Journal
CHEMICAL ENGINEERING JOURNAL
Volume 350, Issue -, Pages 257-267Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.05.186
Keywords
Z-scheme; CdTe/TiO2; Tetracycline; Photocatalytic degradation
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Funding
- National Natural Science Foundation of China [51402277, 51402274, 21401180]
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Due to their high persistence and ecotoxicity, developing a green and efficient approach to remove antibiotic residuals from aquatic environments becomes a challenging task. Efficient, visible light-active and reusable semiconductor photocatalyst is a promising solution to address this issue. In this work, Z-scheme CdTe/TiO2 heterostructure photocatalysts were prepared by a hydrothermal method and the photocatalytic performance of as-prepared samples was evaluated by degradation of tetracycline hydrochloride (TC-H) under visible-light irradiation. The optimal performance was achieved for CdTe/TiO2 heterostructure photocatalyst grown at 120 degrees C, which can decompose 78% TC-H after 30 min irradiation. The improved photocatalytic performance can be ascribed to synergistic effects including excellent visible-light absorption, efficient charge separation and relatively high redox potentials of electrons and holes associated with Z-scheme charge transfer mechanism. The possible degradation byproducts and stability of CdTe/TiO2 heterostructures for TC-H degradation are also elucidated. This Z-scheme CdTe/TiO2 photocatalysts may present a new strategy for degradation of antibiotics, providing an invaluable methodology for alleviation of aquatic environment pollution.
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