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01-09-2020 | Original Paper

Layered Nanocomposite 2D-TiO₂ with Cu₂O Nanoparticles as an Efficient Photocatalyst for 4-Chlorophenol Degradation and Hydrogen Evolution

Authors: Matías Alegría, Juan Aliaga, Luis Ballesteros, Clivia Sotomayor-Torres, Guillermo González, Eglantina Benavente

Published in: Topics in Catalysis | Issue 1-2/2021

Abstract

New composites formed by layered hybrid TiO₂(stearic acid) (LHTiO₂) and, Cu₂O nanoparticles were studied as photocatalysts that extend the response range to light visible for the evolution of hydrogen and the degradation of 4-chlorophenol. The results revealed that LHTiO₂/Cu₂O exhibited a clearly improved photocatalytic degradation, about 5.6 times faster than pristine TiO₂, and hydrogen evolution of about 2.7 times higher than the TiO₂ anatase. The enhanced photocatalytic activity can be assigned to the properties of the two-dimensional morphology, in sheets-like arrangement of LHTiO₂, benefitting from the high exposure of surface, with more active sites available to improve matching with the surfaces of the Cu₂O nanocrystals and significant reduction of migration distances of photogenerated carriers. In the photocatalytic degradation, a mechanism Z-scheme is supported, and in the photocatalytic evolution of hydrogen a mechanism type II band alignment is indicated. Photocatalytic reuse tests showed that stability and catalytic activity of LHTiO₂/Cu₂O were maintained for three cycles. Photoelectrochemical evaluation were performed through measurements of the photocurrent response and electrochemical impedance.

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Title: Layered Nanocomposite 2D-TiO2 with Cu2O Nanoparticles as an Efficient Photocatalyst for 4-Chlorophenol Degradation and Hydrogen Evolution
Authors: Matías Alegría
Juan Aliaga
Luis Ballesteros
Clivia Sotomayor-Torres
Guillermo González
Eglantina Benavente
Publication date: 01-09-2020
Publisher: Springer US
Published in: Topics in Catalysis / Issue 1-2/2021
Print ISSN: 1022-5528
Electronic ISSN: 1572-9028
DOI: https://doi.org/10.1007/s11244-020-01360-6

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