Heterostructured 2D ZnO hybrid nanocomposites sensitized with cubic Cu2O nanoparticles for sunlight photocatalysis

Segovia, Marjorie; Alegría, Matías; Aliaga, Juan Antonio; Celedón, Salvador; Ballesteros, Luis; Torres, C. M. Sotomayor; González, Guillermo; Benavente, E.

doi:10.1007/s10853-019-03878-x

Cited by 23 publications

(12 citation statements)

References 59 publications

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“…The better photocatalytic performance of LHTiO 2 / Cu 2 O (1:0.1) could be ascribed to the lower recombination of the photo-generated electrons and holes and a greater close interface between the 2D sheets with the flat surfaces of the Cu 2 O. Besides, the presence of a hydrophobic organic moiety in LHTiO 2 contributes significantly to the photocatalytic increase, previously observed in photocatalytic studies of organo-inorganic hybrids of TiO 2 and ZnO [16,37].…”

Section: Photocatalytic Activitymentioning

confidence: 66%

“…The photogenerated hole in the LHTiO 2 unites with the H 2 O to produce ‧OH, avoiding the recombination of the photogenerated electron-hole formed. Moreover, it should be observed that the charge-carrier movement for the direct Z-scheme photocatalyst is physically feasible, since the migration of photogenerated electrons is valuable due to the electrostatic attraction of the electron and the hole [20,37,55]. In addition, we have observed by DRX that after irradiation of the sample (Fig.…”

Section: Proposed Degradation Mechanismmentioning

confidence: 93%

“…The nanoparticles were synthesized following a procedure described in the literature [37]. The solid obtained was washed and oven-dried at 45 °C for 24 h.…”

Section: Cu 2 O Nanoparticlesmentioning

confidence: 99%

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

et al. 2020

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New composites formed by layered hybrid TiO 2 (stearic acid) (LHTiO 2 ) and, Cu 2 O 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 LHTiO 2 /Cu 2 O exhibited a clearly improved photocatalytic degradation, about 5.6 times faster than pristine TiO 2 , and hydrogen evolution of about 2.7 times higher than the TiO 2 anatase. The enhanced photocatalytic activity can be assigned to the properties of the two-dimensional morphology, in sheets-like arrangement of LHTiO 2 , benefitting from the high exposure of surface, with more active sites available to improve matching with the surfaces of the Cu 2 O 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 LHTiO 2 /Cu 2 O were maintained for three cycles. Photoelectrochemical evaluation were performed through measurements of the photocurrent response and electrochemical impedance.

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Section: Photocatalytic Activitymentioning

confidence: 66%

Section: Proposed Degradation Mechanismmentioning

confidence: 93%

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

et al. 2020

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“…On the nanoscale, ZnO shows exceptional physicochemical properties that are beneficial in many industrial applications. Many researchers have successfully used ZnO nanostructures in photocatalytic [13][14][15][16], photovoltaic [17][18][19][20], biomedical [21][22][23][24] and sensing [25][26][27][28][29][30][31] applications, as it provides large surface area as compared to its bulk counterpart. The demand of highly efficient, durable and robust photocatalysts for wastewater treatment makes ZnO nanostructures a reliable candidate for photocatalytic applications.…”

Section: Introductionmentioning

confidence: 99%

One-Pot Sonochemical Synthesis of ZnO Nanoparticles for Photocatalytic Applications, Modelling and Optimization

et al. 2019

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This present study proposed a successful one pot synthesis of zinc oxide nanoparticles (ZnO NPs) and their optimisation for photocatalytic applications. Zinc chloride (ZnCl2) and sodium hydroxide (NaOH) were selected as chemical reagents for the proposed study. The design of this experiment was based on the reagents’ amounts and the ultrasonic irradiations’ time. The results regarding scanning electron microscopy (SEM), X-ray diffraction (XRD) and Raman spectroscopy confirmed the presence of ZnO NPs with pure hexagonal wurtzite crystalline structure in all synthesised samples. Photocatalytic activity of the developed samples was evaluated against methylene blue dye solution. The rapid removal of methylene blue dye indicated the higher photocatalytic activity of the developed samples than untreated samples. Moreover, central composite design was utilised for statistical analysis regarding the obtained results. A mathematical model for the optimisation of input conditions was designed to predict the results at any given point. The role of crystallisation on the photocatalytic performance of developed samples was discussed in detail in this novel study.

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“…The solvothermal treatment (ST) was kept at 180 °C for three days under self-generated pressure. The nanoparticles were obtained using the same synthetic conditions as reported by Segovia et al [ 77 ].…”

Section: Methodsmentioning

confidence: 99%

Two-Dimensional Titanium Dioxide–Surfactant Photoactive Supramolecular Networks: Synthesis, Properties, and Applications for the Conversion of Light Energy

Lozano

Devis

Aliaga

et al. 2022

IJMS

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The desire to harness solar energy to address current global environmental problems led us to investigate two-dimensional (2D) core–shell hybrid photocatalysts in the form of a 2D-TiO2–surfactant, mainly composed of fatty acids. The bulk products, prepared by two slightly different methods, consist of stacked host–guest hybrid sheets held together by van der Waals forces between alkyl carboxylate moieties, favoring the synergistic conjugation of the photophysical properties of the core and the hydrophobicity of the self-assembled surfactant monolayer of the shell. X-ray diffraction and the vibrational characteristics of the products revealed the influence of synthesis strategies on two types of supramolecular aggregates that differ in the core chemical structure, guest conformers of alkyl surfactant tails and type, and the bilayer and monolayer of the structure of nanocomposites. The singular ability of the TiO2 core to anchor carboxylate leads to commensurate hybrids, in contrast to both layered clay and layered double-hydroxide-based ion exchangers which have been previously reported, making them potentially interesting for modeling the role of fatty acids and lipids in bio-systems. The optical properties and photocatalytic activity of the products, mainly in composites with smaller bandgap semiconductors, are qualitatively similar to those of nanostructured TiO2 but improve their photoresponse due to bandgap shifts and the extreme aspect-ratio characteristics of two-dimensional TiO2 confinement. These results could be seen as a proof-of-concept of the potential of these materials to create custom-designed 2D-TiO2–surfactant supramolecular photocatalysts.

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Heterostructured 2D ZnO hybrid nanocomposites sensitized with cubic Cu2O nanoparticles for sunlight photocatalysis

Cited by 23 publications

References 59 publications

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

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

One-Pot Sonochemical Synthesis of ZnO Nanoparticles for Photocatalytic Applications, Modelling and Optimization

Two-Dimensional Titanium Dioxide–Surfactant Photoactive Supramolecular Networks: Synthesis, Properties, and Applications for the Conversion of Light Energy

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