Photocatalytic efficiencies of Ni, Mn, Fe and Ag doped ZnO nanostructures synthesized by hydrothermal method: The synergistic/antagonistic effect between ZnO and metals

Türkyılmaz, Şenay Şen; Güy, Nuray; Özacar, Mahmut

doi:10.1016/j.jphotochem.2017.03.027

Cited by 234 publications

(75 citation statements)

References 67 publications

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“…In another study, Park et al reported a k app value of 2:7 × 10 -3 min -1 for photocatalytic degradation of 2,4-dinitrophenol after 140 min under visible light irradiation using functionalized zinc oxide tetrapods as photocatalysts [67]. Türkyilmaz et al reported a k app value of 7:5 × 10 -3 min -1 for visible light photocatalytic degradation of tartrazine after 150 min using Fe-doped ZnO as photocatalysts [22]. Kuriakose et al reported a k app value of 2:2 × 10 -2 min -1 for MB photocatalytic degradation after 30 min under visible light irradiation using Cu-doped ZnO powders as photocatalyst [68].…”

Section: Optical Studymentioning

confidence: 99%

“…Different strategies have been reported to extend photoresponse of semiconductors into the visible light region: (a) sensitization with natural and synthetic dyes [8][9][10][11], (b) coupled semiconductors [12][13][14], (c) surface plasmon resonance [15][16][17][18], and (d) doping ZnO structure with metals and nonmetals [19][20][21]. Among these, the doping process can modify the band gap of ZnO, generating electronic state intragap inside of the semiconductor thus ensuring the photoactivity redshift; on that topic, different authors have reported that ZnO changed photoresponse after the doping process [22].…”

Section: Introductionmentioning

confidence: 99%

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Methylene Blue Photodegradation under Visible Irradiation on Ag-Doped ZnO Thin Films

Vallejo

Cantillo

Díaz‐Uribe

2020

International Journal of Photoenergy

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This study synthesized and characterized Ag-doped ZnO thin films. Doped ZnO powders were synthesized using the sol-gel method, and thin films were fabricated using the doctor blade technique. The Ag content was determined by optical emission spectrometers with inductively coupled plasma (ICP plasma). Additionally, X-ray diffraction, Raman spectroscopy, Atomic Force Microscopy (AFM), diffuse reflectance, and X-ray photoelectron spectroscopy (XPS) measurements were used for physicochemical characterization. Finally, the photocatalytic degradation of methylene blue (MB) was studied under visible irradiation in aqueous solution. The Langmuir-Hinshelwood model was used to determine the reaction rate constant of the photocatalytic degradation. The physicochemical characterization showed that the samples were polycrystalline, and the diffraction signals corresponded to the ZnO wurtzite crystalline phase. Raman spectroscopy verified the ZnO doping process. The AFM analysis showed that roughness and grain size were reduced after the doping process. Furthermore, the optical results indicated that the presence of Ag improved the ZnO optical properties in the visible range, and the Ag-doped ZnO thin films had the lowest band gap value (2.95 eV). Finally, the photocatalytic degradation results indicated that the doping process enhanced the photocatalytic activity under visible irradiation, and the Ag-doped ZnO thin films had the highest MB photodegradation value (45.1%), as compared to that of the ZnO thin films (2.7%).

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Section: Optical Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Methylene Blue Photodegradation under Visible Irradiation on Ag-Doped ZnO Thin Films

Vallejo

Cantillo

Díaz‐Uribe

2020

International Journal of Photoenergy

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“…However, the chemical and physical synthesis method involves chemical reagents or stabilizing agents that are a major concern towards environmental safety and sustainability. [34][35][36] In this context, successive phytosynthetic routes have been investigated and reported, 37,38,[42][43][44][45][46] and have many advantages in terms of reduced toxicity, and the simplicity of method over the chemical synthesis approach. 39,40,83 In the present study, bio-templated mixed metal oxides have been investigated as a facile, greener nanomaterial with enhanced surface properties to replace chemically synthesized material.…”

Section: Introductionmentioning

confidence: 99%

Organic template-based ZnO embedded Mn₃O₄ nanoparticles: synthesis and evaluation of their electrochemical properties towards clean energy generation

et al. 2020

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To deal with fossil fuel depletion and the rise in global temperatures caused by fossil fuels, cheap and abundant materials are required, in order to fulfill energy demand by developing high-performance fuel cells and electrocatalysts. In this work, a natural organic agent has been used to synthesize nanostructured ZnO/Mn 3 O 4 with high surface area and enhanced electrocatalytic performance. Upon preannealing treatment, mixed metal oxide precipitates are formed due to the complex formation between a metal oxide and organic extract. The thermally annealed mixed oxide ZnO/Mn 3 O 4 was characterized by XRD diffractometer, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX). Gas chromatography-mass spectrometry (GC-MS) identified methyldecylamine as a major stabilizing agent of the synthesized nanomaterial. Using a Tauc plot, the calculated band energy for the synthesized ZnO/Mn 3 O 4 mixed metal oxide was 1.65 eV.Moreover, we have demonstrated the effects of incorporated organic compounds on the surface chemistry, morphology and electrochemical behavior of ZnO/Mn 3 O 4 . The phyto-functionalized ZnO/ Mn 3 O 4 was deposited on Ni-foam for electrocatalytic studies. The fabricated electrode revealed good performance with low over-potential and Tafel slope, suggesting it to be suitable as a potential catalyst for water splitting application, in particular for the oxygen evolution reaction (OER). The overall findings of the current study provide a cost-effective and efficient organic template for functionalization and sustainable fabrication of ZnO/Mn 3 O 4 nanomaterial for application as an electrocatalyst.

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“…As a result, Cu/ZnO will show the decreased degradation efficiency . Turkyilmaz et al synthesized (Ni, Mn, Fe, and Ag)‐doped ZnO by hydrothermal method . The lowest band gap was related to Mn/ZnO photocatalyst (3.00 eV).…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis, characterization, and decolorization activity of Mn²⁺ and Al³⁺ co‐doped hexagonal‐like ZnO nanostructures as photocatalysts

Shahbazkhany

Salehi

Mousavi‐Kamazani

2020

Applied Organom Chemis

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A good photocatalyst with high efficiency can be synthesized easily using eco‐friendly materials and processes. Our synthesized samples exhibit all of the aforementioned features. In this work, manganese co‐doped ZnO at different weight percentages (3, 6, 9, and 15 wt.%) with and without 1.5 wt.% aluminum was synthesized by hydrothermal method, and their photocatalytic activity in aqueous solutions of methyl orange (MO) was investigated under visible light. The structural and optical properties of the samples were characterized using X‐ray powder diffraction, Fourier‐transform infrared spectroscopy, scanning electron microscopy, energy‐dispersive X‐ray analysis, and diffuse reflectance spectroscopy. In this work, Mn2+ ions in the 9%Mn/ZnO sample and Mn2+, Al3+ ions in the (9%Mn, 1.5%Al)/ZnO sample calcined at 800 °C were replaced instead with some Zn2+ ions in hexagonal wurtzite structures of ZnO. These structures were found next to each other in the form of a hexagonal shape that created 3D‐hexagonal‐like ZnO nanostructures. Finally, nanoparticles (NPs) and nano hexagonal‐like ZnO nanostructures were, respectively, dispersed on the surface of 3D‐hexagonal‐like structure of 9%Mn/ZnO and (9%Mn, 1.5%Al)/ZnO. Diffuse reflectance spectroscopy analysis showed that the (9%Mn, 1.5%Al)/ZnO sample had more light absorption than 9%Mn/ZnO. However, contrary to our expectations, the 9%Mn/ZnO sample had better decolorization efficiency (94%) after 60 min under visible light, which could be attributed to a significant increase in the level of recombination by the aluminum ions.

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Photocatalytic efficiencies of Ni, Mn, Fe and Ag doped ZnO nanostructures synthesized by hydrothermal method: The synergistic/antagonistic effect between ZnO and metals

Cited by 234 publications

References 67 publications

Methylene Blue Photodegradation under Visible Irradiation on Ag-Doped ZnO Thin Films

Methylene Blue Photodegradation under Visible Irradiation on Ag-Doped ZnO Thin Films

Organic template-based ZnO embedded Mn₃O₄ nanoparticles: synthesis and evaluation of their electrochemical properties towards clean energy generation

Facile synthesis, characterization, and decolorization activity of Mn²⁺ and Al³⁺ co‐doped hexagonal‐like ZnO nanostructures as photocatalysts

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Photocatalytic efficiencies of Ni, Mn, Fe and Ag doped ZnO nanostructures synthesized by hydrothermal method: The synergistic/antagonistic effect between ZnO and metals

Cited by 234 publications

References 67 publications

Methylene Blue Photodegradation under Visible Irradiation on Ag-Doped ZnO Thin Films

Methylene Blue Photodegradation under Visible Irradiation on Ag-Doped ZnO Thin Films

Organic template-based ZnO embedded Mn3O4 nanoparticles: synthesis and evaluation of their electrochemical properties towards clean energy generation

Facile synthesis, characterization, and decolorization activity of Mn2+ and Al3+ co‐doped hexagonal‐like ZnO nanostructures as photocatalysts

Contact Info

Product

Resources

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Organic template-based ZnO embedded Mn₃O₄ nanoparticles: synthesis and evaluation of their electrochemical properties towards clean energy generation

Facile synthesis, characterization, and decolorization activity of Mn²⁺ and Al³⁺ co‐doped hexagonal‐like ZnO nanostructures as photocatalysts