Layered Nanocomposite 2D-TiO 2 with Cu 2 O Nanoparticles as an Efficient Photocatalyst for 4-Chlorophenol Degradation an
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ORIGINAL PAPER
Layered Nanocomposite 2D‑TiO2 with Cu2O Nanoparticles as an Efficient Photocatalyst for 4‑Chlorophenol Degradation and Hydrogen Evolution Matías Alegría1 · Juan Aliaga1 · Luis Ballesteros2 · Clivia Sotomayor‑Torres3,4 · Guillermo González5 · Eglantina Benavente1,6
© Springer Science+Business Media, LLC, part of Springer Nature 2020
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 L HTiO2/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 C u 2O 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. Keywords Layered 2D-TiO2 · Cu2O · Photocatalysis · Degradation of 4-chlorophenol · Hydrogen evolution
1 Introduction Photocatalytic reaction systems have been extensively studied for environmental remediation and solar energy conversion [1–3]. Photocatalysis is a semiconductor-mediated process that can absorb and utilize light for chemical reactions, Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11244-020-01360-6) contains supplementary material, which is available to authorized users. * Guillermo González [email protected] * Eglantina Benavente [email protected] 1
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Departamento de Química, Facultad de Ciencias Naturales, Matemáticas y del Medio Ambiente, Universidad Tecnológica Metropolitana, Santiago, Chile Instituto de Ciencias Químicas Aplicadas, Inorganic Chemistry and Molecular Material Center, Facultad de Ingeniería, Universidad Autónoma de Chile, El Llano Subercaseaux, 2801 San Miguel, Santiago, Chile
and requires semiconductors that can provide charge transfer to the surface-active sites, stability, and the harvesting of a wide range of the solar spectrum [4–6]. In this context, one of the most studied semiconductors is TiO2, mainly for its low cost, low toxicity, photo-stability, reactivity and abundance [7, 8]. Nevertheless, its large bandgap (3.2 eV) and fast charge recombination limit its application in photocatalytic processes [9, 10].
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Catalan
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