Synthesis and characterization of n-ZnO/p-MnO nanocomposites for the photocatalytic degradation of anthracene

[Display omitted] •One pot synthesis of n-ZnO/p-MnO nanocomposites.•Spectroscopic and morphological characterization of nanocomposites.•Electrochemical characterization demonstrated a p-n junction.•The p-n junction improve the photocatalytic degradation of anthracene. n-ZnO/p-MnO nanocomposites with...

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Published in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 2019-01, Vol.369, p.85-96
Main Authors: Martínez-Vargas, Blanca L., Cruz-Ramírez, Marisela, Díaz-Real, Jesús A., Rodríguez-López, J.L., Bacame-Valenzuela, Francisco Javier, Ortega-Borges, Raúl, Reyes-Vidal, Yolanda, Ortiz- Frade, Luis
Format: Article
Language:English
Subjects:
Anthracene
Anthraquinone
Electrochemistry
Electron transport
Ethanol
Manganese
Manganese oxides
n-ZnO/p-MnO
Nanocomposite
Nanocomposites
PAHs photocatalytic activity
Photocatalysis
Photodegradation
Time constant
Zinc oxide
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Summary:[Display omitted] •One pot synthesis of n-ZnO/p-MnO nanocomposites.•Spectroscopic and morphological characterization of nanocomposites.•Electrochemical characterization demonstrated a p-n junction.•The p-n junction improve the photocatalytic degradation of anthracene. n-ZnO/p-MnO nanocomposites with different percentages of manganese (0.5%, 1.1%, and 2.25%) with a semiconducting junction were prepared. Changes in Flat band potential (Efb) for ZnO due the different amounts of MnO was observed, meanwhile same donor density (Nd) was held in all materials. From chronoamperometric experiments under on-off illuminated conditions a transient time constant (τ), related to the electron transport in the electrodes were calculated, where higher values are observed in materials with high amounts of MnO. Photodegradation studies of anthracene in an ethanol:water (1:1, pH 12) solution were performed, showing that anthraquinone is the main product with no photodegrading of ethanol. The results suggest that the junction n-ZnO/p-MnO and materials with high transient time constant (τ), enhance the photocatalytic degradation. The best photocatalytic performance for the photodegradation of anthracene was obtained with the nanocomposite n-ZnO /p-MnO(Mn=2.25%).
ISSN:1010-6030
1873-2666
DOI:10.1016/j.jphotochem.2018.10.010