Eu-modified ZnO nanoparticles for applications in photocatalysis

Hernández-Carrillo, M.A.; Torres-Ricárdez, R.; García-Mendoza, M. F.; Ramírez-Morales, E.; Rojas-Blanco, L.; Flores, Laura Lorena Díaz; Sepúlveda-Palacios, G.E.; Paraguay‐Delgado, F.; Pérez-Hernández, G.

doi:10.1016/j.cattod.2018.04.060

Cited by 81 publications

(38 citation statements)

References 31 publications

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“…The UV-vis spectra were measured using a Persee TU-1900 UV-vis spectrophotometer, in the wavelength range of 200-800 nm. [26][27][28]. It is notable that the characteristic diffraction peak of GO at 2θ = 12:6°was not found in the XRD pattern of ZnO-GO, which was probably because ZnO crystals were covered by limited amounts of GO that changed its structure [29].…”

Section: Photocatalytic Activity Testsmentioning

confidence: 96%

Green Synthesis of ZnO-GO Composites for the Photocatalytic Degradation of Methylene Blue

Lin

Hong

Chen

et al. 2020

Journal of Nanomaterials

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Beneficial from the excellent optical performance of zinc oxide (ZnO) nanocrystals and the absorption properties of graphene oxide (GO), the nanocomposites of ZnO and GO with synergistic photocatalytic effects were prepared by a precipitation method, in which GO is utilized as the catalyst carrier. The prepared composites were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, UV-vis spectroscopy, field emission scanning electron microscopy, and transmission electron microscopy and also performed photocatalytic activity for the nanocomposites. The results show that ZnO is uniformly loaded on the surface of GO assisted by an effective interface coupling. Due to interface coupling between ZnO and GO, electrons can be directly transferred from the valence band of ZnO to GO. The photodegradation efficiency of the composites reaches to 97.6%, and the first-order reaction rate constant of photodegradation is calculated to be 0.04401 min-1. The novel ZnO-GO composites with excellent photocatalytic performance display promising potential applications in the field of photocatalysis and will provide a new platform for building next-generation graphene-based semiconductor composites.

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Section: Photocatalytic Activity Testsmentioning

confidence: 96%

Green Synthesis of ZnO-GO Composites for the Photocatalytic Degradation of Methylene Blue

Lin

Hong

Chen

et al. 2020

Journal of Nanomaterials

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“…In recent years, rare-earth (RE) metals have been used as dopants in RE/ZnO; these include Er [21,22], Eu [23][24][25], Nd [26,27], Tm [28], and La [29][30][31]. Suwanboon et al synthesized La-doped zinc oxide nanoparticles (La/ZnO NPs) using a precipitation and mechanical milling technique, and they investigated the blue-light-fluorescent-lamp-driven photodegradation activity of methyl blue.…”

Section: Introductionmentioning

confidence: 99%

Cerium-Oxide-Nanoparticle-Decorated Zinc Oxide with Enhanced Photocatalytic Degradation of Methyl Orange

et al. 2020

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Cerium-oxide-nanoparticle-decorated zinc oxide was successfully prepared using a simple one-pot hydrothermal technique with different weight% Ce doping. It was found that an increase in Ce doping has an effect on the optical energy band-gap tunability. Ce dopant provides electron trapping on Ce/ZnO nanocomposites and also acts as a surface defect generator during hydrothermal processing. Additionally, a bi-metal oxide heterojunction forms, which acts as a charge separator to obstruct charge recombination and to increase the photodegradation performance. It was found that the methyl orange (MO) degradation performance improved with an increase in Ce doping. The decomposition of MO went from 69.42% (pristine ZnO) to 94.06% (7% Ce/ZnO) after 60 min under fluorescent lamp illumination.

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“…Previous works have proven that the photocatalytic activity of ZnO is significantly affected by its morphology [19], crystal size [20], crystal orientation [21] and also optical properties [22]. But, discussion on active sites analysis is still vague and most of the literature provides only light amount of study [23][24][25][26][27]. Though, the latest study by Xiao et al reported in detail that larger specific surface area and more catalytic active sites led to improved performance of photocatalytic activity [28].…”

Section: Introductionmentioning

confidence: 99%

Comparative study on photocatalytic activity of transition metals (Ag and Ni)-doped ZnO nanomaterials synthesized via sol–gel method

et al. 2020

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Ag and Ni/ZnO photocatalyst nanostructures were successfully synthesized by a sol–gel method. In this work, the photocatalyst sample was systematically studied based on several factors affecting the performance of photocatalyst, which are size, morphology, band gap, textural properties and the number of active sites presence on the surface of the nanocatalyst. X-ray diffraction revealed that Ag/ZnO nanomaterials experienced multiple phases, meanwhile for Ni/ZnO the phase of nanomaterials were pure and single phase for stoichiometry less than 5%. Field emission scanning electron microscope (FESEM) showed almost all of the synthesized nanomaterials possessed a mixture of nanorods and spherical-like shape morphology. The Ag/ZnO showed high photocatalytic activity, producing at least 14th trials of nanocatalyst reusability on degradation of methyl orange under UV irradiation. Interestingly, this phenomenon was not observed in larger surface area of Ni/ZnO nanomaterials which supposedly favour photocatalytic activity, but instead producing poor photocatalytic performance. The main reasons were studied and exposed by temperature-programmed desorption of carbon dioxide (TPD–CO 2 ) which showed that incorporation of Ag into ZnO lattice has enhanced the number of active sites on the surface of the nanocatalyst. Whereas incorporation of Ni in ZnO has lowered the number of active sites with respect to undoped ZnO. Active sites measurement is effective and significant, providing opportunities in developing an intensive study as an additional factor.

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Eu-modified ZnO nanoparticles for applications in photocatalysis

Cited by 81 publications

References 31 publications

Green Synthesis of ZnO-GO Composites for the Photocatalytic Degradation of Methylene Blue

Green Synthesis of ZnO-GO Composites for the Photocatalytic Degradation of Methylene Blue

Cerium-Oxide-Nanoparticle-Decorated Zinc Oxide with Enhanced Photocatalytic Degradation of Methyl Orange

Comparative study on photocatalytic activity of transition metals (Ag and Ni)-doped ZnO nanomaterials synthesized via sol–gel method

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