Pulsed laser deposition of Co3O4 nanoparticles assembled coating: Role of substrate temperature to tailor disordered to crystalline phase and related photocatalytic activity in degradation of methylene blue

Warang, Trupti N.; Patel, N.; Santini, A.; Bazzanella, Nicola; Кале, А.; Miotello, A.

doi:10.1016/j.apcata.2012.02.037

Cited by 100 publications

(75 citation statements)

References 34 publications

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“…The Co 2p1/2 peak was ~15.2 eV higher than the Co2p 3/2 peak, and the shake-up satellite peaks were ~9.4 eV higher than the corresponding Co 2p spin-orbit peaks and their intensities were rather weak. These features are similar to those reported for Co 3 O 4 [48] and can be related to the Co(Co, Al) 2 O 4 spinel. In addition, a shoulder peak at ~783.8 eV appeared.…”

Section: Xps Analysissupporting

confidence: 84%

Cobalt-aluminum mixed oxides prepared from layered double hydroxides for the total oxidation of benzene

Ding

Wei

et al. 2015

Applied Catalysis A: General

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Section: Xps Analysissupporting

confidence: 84%

Cobalt-aluminum mixed oxides prepared from layered double hydroxides for the total oxidation of benzene

Ding

Wei

et al. 2015

Applied Catalysis A: General

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“…These reactions are driven by the increased capacity for the spontaneous release of oxygen from the Co 3 O 4 /CeO 2 system, even in the absence of a reducing agent. In the presence of the Co 3 O 4 species, the catalyst promotes the reduction of Ce +4 /Ce +3 , this factor being favorable for the oxidation of hydrocarbons (Warang et al, 2012). The addition of cobalt in the CeO 2 structure reduces the lattice parameter, suggesting the incorporation of Co 3 O 4 by way of Co-O-Ce bonds (Kang et al, 2003;Murgida et al, 2012).…”

Section: Catalytic Activity Testsmentioning

confidence: 99%

Catalytic oxidation of volatile organic compounds (n-hexane, benzene, toluene, o-xylene) promoted by cobalt catalysts supported on γ-Al2O3-CeO2

Balzer

Probst

Drago

et al. 2014

Braz. J. Chem. Eng.

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-Cobalt catalysts supported on γ-alumina, ceria and γ-alumina-ceria, with 10 or 20%wt of cobalt load, prepared by the wet impregnation method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), field emission transmission electron microscopy (FETEM), N 2 adsorptiondesorption isotherms (BET/BJH methods), energy-dispersive X-ray spectroscopy (EDX), X-ray photoemission spectroscopy (XPS), O 2 -chemisorption and temperature programmed reduction (TPR) were used to promote the oxidation of volatile organic compounds (n-hexane, benzene, toluene and o-xylene). For a range of low temperatures (50-350 °C), the activity of the catalysts with a higher cobalt load (20% wt) was greater than that of the catalysts with a lower cobalt load (10% wt). The Co/γ-Al 2 O 3 -CeO 2 catalytic systems presented the best performances. The results obtained in the characterization suggest that the higher catalytic activity of the Co 20 /γ-Al 2 O 3 -CeO 2 catalyst may be attributed to the higher metal content and amount of oxygen vacancies, as well as the effects of the interaction between the cobalt and the alumina and cerium oxides.

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“…1 Among them, spinel-type cobalt oxide (Co 3 O 4 ) as a versatile semiconducting material has achievable applications in gas sensors, 2,3 heterogeneous catalysts, [4][5][6] electrochemical devices, 7 Li-ion batteries, [8][9][10][11] magnetic materials 12,13 and photocatalysts. 14,15 In recent years, the increasing interest has been focused on the synthesis of Co 3 O 4 nanostructures because of the influences of particle size on their properties and applications. [16][17][18][19][20][21][22][23][24][25][26] Various wetchemical methods such as hydro-/solvothermal method, 27,28 combustion method, [29][30][31] microwave heating, [32][33][34] sol-gel process, 35 spray pyrolysis, 36 sonochemical method, 37 co-precipitation, 38 ionic liquid-assisted method, 39 polyol method 40 and a non-aqueous route 41 have been reported to synthesize Co 3 O 4 nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Cobalt Oxide Nanoparticles Prepared by the Thermal Decomposition

Farhadi¹,

Javanmard²,

Nadri³

2016

ACSi

147

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In this work, thermal decomposition of the [Co(NH 3 ) 5 (H 2 O)](NO 3 ) 3 precursor complex was investigated under solid state conditions. Thermal analysis (TG/DTA) showed that the complex was easily decomposed into the Co 3 O 4 nanoparticles at low temperature (175 °C) without using any expensive and toxic solvent or a complicated equipment. The obtained product was identified by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDX). Optical and magnetic properties of the products were studied by UV-visible spectroscopy and a vibrating sample magnetometer (VSM), respectively. FT-IR, XRD and EDX analyses confirmed the formation of highly pure spinel-type Co 3 O 4 phase with cubic structure. SEM and TEM images showed that the Co 3 O 4 nanoparticles have a sphere-like morphology with an average size of 17.5 nm. The optical absorption spectrum of the Co 3 O 4 nanoparticles showed two band gaps of 2.20 and 3.45 eV, which in turn confirmed the semiconducting properties. The magnetic measurement showed a weak ferromagnetic order at room temperature. Photocatalytic degradation of methylene blue (MB) demonstrated that the as-prepared Co 3 O 4 nanoparticles have good photocatalytic activity under visible-light irradiation.

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Pulsed laser deposition of Co3O4 nanoparticles assembled coating: Role of substrate temperature to tailor disordered to crystalline phase and related photocatalytic activity in degradation of methylene blue

Cited by 100 publications

References 34 publications

Cobalt-aluminum mixed oxides prepared from layered double hydroxides for the total oxidation of benzene

Cobalt-aluminum mixed oxides prepared from layered double hydroxides for the total oxidation of benzene

Catalytic oxidation of volatile organic compounds (n-hexane, benzene, toluene, o-xylene) promoted by cobalt catalysts supported on γ-Al2O3-CeO2

Characterization of Cobalt Oxide Nanoparticles Prepared by the Thermal Decomposition

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