Solvothermal synthesis of Ag/ZnO and Pt/ZnO nanocomposites and comparison of their photocatalytic behaviors on dyes degradation

Muñoz-Fernandez, L.; Sierra-Fernández, Aránzazu; Milošević, Olivera; Rabanal, M.E.

doi:10.1016/j.apt.2016.03.021

Cited by 77 publications

(32 citation statements)

References 69 publications

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“…For this reason, the enhancement of the separated electron-hole lifetime is one of the factors on which the efforts are focused in order to improve the ZnO photocatalytic performance [26][27][28]. This aspect can be achieved through various methods, such as the modification of the morphology of the ZnO nanostructures [22,29], the incorporation of metallic [30,31] and non-metallic dopants [32] in their crystalline structure, and the preparation of hybridized structures with other materials [21,22,33,34].…”

Section: Introductionmentioning

confidence: 99%

Au/ZnO Hybrid Nanostructures on Electrospun Polymeric Mats for Improved Photocatalytic Degradation of Organic Pollutants

Campagnolo

Lauciello

Athanassiou

et al. 2019

Water

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An innovative approach for the fabrication of hybrid photocatalysts on a solid porous polymeric system for the heterogeneous photocatalytic degradation of organic pollutants is herein presented. Specifically, gold/zinc oxide (Au/ZnO)-based porous nanocomposites are formed in situ by a two-step process. In the first step, branched ZnO nanostructures fixed on poly(methyl methacrylate) (PMMA) fibers are obtained upon the thermal conversion of zinc acetate-loaded PMMA electrospun mats. Subsequently, Au nanoparticles (NPs) are directly formed on the surface of the ZnO through an adsorption dipping process and thermal treatment. The effect of different concentrations of the Au ion solutions to the formation of Au/ZnO hybrids is investigated, proving that for 1 wt % of Au NPs with respect to the composite there is an effective metal–semiconductor interfacial interaction. As a result, a significant improvement of the photocatalytic performance of the ZnO/PMMA electrospun nanocomposite for the degradation of methylene blue (MB) and bisphenol A (BPA) under UV light is observed. Therefore, the proposed method can be used to prepare flexible fibrous composites characterized by a high surface area, flexibility, and light weight. These can be used for heterogeneous photocatalytic applications in water treatment, without the need of post treatment steps for their removal from the treated water which may restrict their wide applicability and cause secondary pollution.

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Section: Introductionmentioning

confidence: 99%

Au/ZnO Hybrid Nanostructures on Electrospun Polymeric Mats for Improved Photocatalytic Degradation of Organic Pollutants

Campagnolo

Lauciello

Athanassiou

et al. 2019

Water

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“…In recent years, semiconductor heterogeneous photocatalysis has received wide attention and been developed due to its important application for the degradation of organic contaminants from industrial effluents by effective utilization of solar energy . Amongst the various oxide‐based semiconductor photocatalysts applied, TiO 2 and ZnO are the most frequently used photocatalysts . Recently, some studies have shown that ZnO, with a high photosensitivity, non‐expensive cost, and excellent chemical stability has better photocatalytic activity in degradation of some organic pollutions than that of TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6] Amongst the various oxide-based semiconductor photocatalysts applied, TiO 2 and ZnO are the most frequently used photocatalysts. [3,[7][8][9] Recently, some studies have shown that ZnO, with a high photosensitivity, non-expensive cost, and excellent chemical stability has better photocatalytic activity in degradation of some organic pollutions than that of TiO 2 . [6,[10][11][12][13][14] However, a ZnO semiconductor with a wide band gap of 3.37 eV leads to the fast recombination of photogenerated electron-hole pairs in the photocatalysis process and shows strong light absorption only in the UV light region which merely account for 4 % of the solar spectrum.…”

Section: Introductionmentioning

confidence: 99%

Enhanced visible photocatalytic activity of Fe‐Cu‐ZnO/graphene oxide photocatalysts for the degradation of organic dyes

et al. 2018

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Fe‐Cu‐ZnO/graphene oxide (Fe‐Cu‐ZnO/GO) photocatalysts are successfully prepared by the sol‐gel method and characterized by X‐ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), high resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectrometry (FTIR), UV‐Vis diffuse reflectance spectra (UV‐Vis DRS), and X‐ray photoelectron spectroscopy (XPS). The results show that the Fe‐Cu‐ZnO/GO photocatalyst has the smaller average crystallite size and the narrower band gap, exhibits the stronger light absorption in the whole visible light region, and possesses better charge separation capability than that of pure ZnO, ZnO/GO, and Cu‐ZnO/GO photocatalysts. The photocatalytic activity of these catalysts is tested by degradation of dark green dye under visible light irradiation which demonstrates that Fe‐Cu‐ZnO/GO photocatalyst effectively degrades dark green dye and shows a significant photocatalytic enhancement compared to ZnO, ZnO/GO, and Cu‐ZnO/GO photocatalysts. The degradation rate of dark green dye can reach up to 99.28 %, when the initial concentration of dark green dye is 50 mg/L and the Fe‐Cu‐ZnO/GO catalyst dosage is 1 g/L with neutral pH under 90 min of visible light irradiation. In addition, Fe‐Cu‐ZnO/GO photocatalyst shows a good degradation efficiency on three other dyes. Meanwhile, the catalyst shows relatively superior reusability according to the cycling tests.

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“…Normally, semiconductor photocatalytic technology is based on energy band theory. When the incident photon energy is larger than the band gap energy ( E g ) of the semiconductor, electrons (e − ) will be excited and promoted from the valence band (VB) to the conduction band (CB), leaving an equal number of holes (h + ) behind [ 1 ]. Then, the electrons and holes will combine with O 2 and H 2 O, forming

and ·OH to react with the organic pollutants as they spread to the surface of the semiconductor.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Iron Adsorption on the Electronic and Photocatalytic Properties of the Zinc Oxide (0001) Surface: A First-Principles Study

et al. 2018

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The structural stability, electronic structure, and optical properties of an iron-adsorbed ZnO (0001) surface with three high-symmetry adsorption sites are investigated with first-principle calculations on the basis of density functional theory and the Hubbard-U method. It is found that the iron adatom in the H3 adsorption site of ZnO (0001) surface has the lowest adsorption energy of −5.665 eV compared with T4 and Top sites. For the Top site, compared with the pristine ZnO (0001) surface, the absorption peak located at 1.17 eV has a red shift, and the elevation of the absorption coefficient is more pronounced in the visible-light region, because the Fe-related levels are introduced in the forbidden band and near the Fermi level. The electrostatic potential computation reveals that the work function of the ZnO (0001) surface is significantly decreased from 2.340 to 1.768 eV when iron is adsorbed on the Top site. Furthermore, the degradation mechanism based on the band structure is analyzed. It can be concluded that the adsorption of iron will promote the separation of photoinduced carriers, thus improving the photocatalytic activity of ZnO (0001) surface. Our study benefits research on the photocatalytic activity of ZnO and the utilization rate of solar energy.

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Solvothermal synthesis of Ag/ZnO and Pt/ZnO nanocomposites and comparison of their photocatalytic behaviors on dyes degradation

Cited by 77 publications

References 69 publications

Au/ZnO Hybrid Nanostructures on Electrospun Polymeric Mats for Improved Photocatalytic Degradation of Organic Pollutants

Au/ZnO Hybrid Nanostructures on Electrospun Polymeric Mats for Improved Photocatalytic Degradation of Organic Pollutants

Enhanced visible photocatalytic activity of Fe‐Cu‐ZnO/graphene oxide photocatalysts for the degradation of organic dyes

The Impact of Iron Adsorption on the Electronic and Photocatalytic Properties of the Zinc Oxide (0001) Surface: A First-Principles Study

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