The effect of the preparation method of Nb2O5 oxide influences the performance of the photocatalytic activity

Raba, Angela; Barba-Ortega, J.; Joya, M. R.

doi:10.1007/s00339-015-9041-3

Cited by 32 publications

(26 citation statements)

References 37 publications

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“…The starting precursors were niobium (V) ethoxide, (Nb(OC 2 H 5 ) 5 99.999% Alfa Aesar) and niobium clorure (NbCl 5 99% Sigma-Aldrich). The niobium pentoxide nanostructure materials obtained were calcined at 500 • C, 650 • C and 750 • C for 2 h [19,20].…”

Section: Methodsmentioning

confidence: 99%

“…Structurally isolated NbO 6 octahedra are not efficient luminescent centers [18], whereas isolated distorted niobate groups, such as in LaNbO 4 , where the Nb(V) has a 4 + 2 coordination, provide very efficient centers. The closer the Nb-O-Nb angles are to 180 the more pronounced the effects of the NbO 6 condensation become [16,17,[19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Nano-Particles of Niobium Pentoxide with Orthorhombic Symmetry

Joya

Barba-Ortega

Raba-Páez

et al. 2017

Metals

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Abstract:In this work, a set of nanoparticles of Nb 2 O 5 nanoparticles were grown by both the Pechini and the sol-gel methods. The amorphous materials were calcined at 650 • C or at 750 • C. X-ray diffraction, scanning electron microscopy, luminescence and Raman spectroscopy were used in order to characterize the materials. From the study, it is possible to state that the method of production of nanoparticles, beyond the temperature of synthesis, has a great influence on whether the phase produced is hexagonal or orthorhombic. Additionally, compared to de Sol-gel method, the Pechini method produced samples with smaller particle sizes. The photoluminescence spectra of niobium pentoxide nanostructure materials show that the emission peaks are positioned between 334 to 809 nm and there is a change of intensity which varies depending on the synthesis route used. High pressure Raman spectra at room temperature were obtained from two samples grown by the sol-gel method. Up to 6 GPa, where it is possible to observe the Raman bands, no modification other than the increase of disorder was observed, and this can be associated with a change of phase.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Nano-Particles of Niobium Pentoxide with Orthorhombic Symmetry

Joya

Barba-Ortega

Raba-Páez

et al. 2017

Metals

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“…As the available water treatment technologies involving biological, physical and chemical methods such as membrane filtration, coagulation, sedimentation, reverse osmosis, reduction, oxidation, ion‐ exchange, UV treatment, aerobic and anaerobic processing have limitations on large scale implementation involving high operating costs and generating toxic secondary pollutants into the ecosystem, advanced oxidation techniques have been proposed . The heterogeneous semiconductor metal oxides such as TiO 2 , Fe 2 O 3 , ZnO, ZrO 2 ,WO 3 and Nb 2 O 5 as well as their nanoscale particles have found wide utility in waste water treatment owing to their efficient photocatalytic activity in the degradation of a large number of environmental pollutants under UV light irradiation involving photochemical reaction which is known to occur at the surface of metal oxide semiconductor …”

Section: Introductionmentioning

confidence: 99%

Photocatalytic and Antibacterial Activity Studies of ZnO Nanoparticles Synthesized by Thermal Decomposition of Mechanochemically Processed Oxalate Precursor

2016

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The ZnO nanoparticles (NPs) have been prepared by thermal decomposition of zinc oxalate precursor ZnC2O4.2H2O synthesized by a simple solution‐free mechanochemical method. Thermogravimetric analysis/Differential thermal analysis (TGA/DTA) studies of oxalate precursor showed it to undergo two step decomposition yielding zinc oxide nanoparticles. The ZnO NPs have been thoroughly characterized by Powder X‐ray diffraction (XRD), Fourier Transform Infrared (FTIR), Transmission Electron Microscopy (TEM) and UV‐Visible techniques. XRD pattern showed that nanoparticles present hexagonal wurtzite phase of ZnO with high crystallinity. The Rietveld's refinement of the XRD pattern has shown the average grain size of the as synthesized nanoparticles to be 13 nm. The photocatalytic activity of as prepared ZnO NPs studied using Methyl Orange (MO) as probe molecule have effected ∼90 % degradation of 0.045 mM of MO in 100 min at catalyst load of 1.5 g L−1. As prepared ZnO NPs photocatalyst are appreciably stable and reusable. The antibacterial activity study of ZnO NPs assayed against Gram positive bacteria Staphylococcus aureus and Staphylococcus epidermidis and Gram negative bacteria Pseudomonas aeruginosaandEnterobacter aerogenes by MIC method has shown that as prepared ZnO NPs constitute effective antibacterial agents.

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“…The samples were prepared by the polymer precursors method (Pechini method). Aqueous solutions of niobium citrate and metal dopant were prepared following the procedure reported previously in Ref: the metal nitrate at 1% and 2.5% concentrations (manganese nitrate‐Merck, iron nitrate‐Merck and nickel nitrate‐Merk) was completely solubilized in distilled water. Then, niobium chloride (Merck 98%) solubilized in distilled water was incorporated.…”

Section: Methodsmentioning

confidence: 99%

“…Several studies have shown that the Nb 2 O 5 exhibits photocatalytic properties such as selective oxidation of organic pollutants, photodegradation of organic dyes, and hydrogen production . In previous studies the results of the evaluation of photocatalytic properties of Nb 2 O 5 were presented, which was synthesized using the method of polymer precursors in Ref and the sol‐gel method in Ref . In the present study, the performance of oxide obtained through the method of polymer precursors in photoinduced processes of Rhodamine B and Atrazine degradation, it was found that the samples showed similar photoactivity, even at low annealing temperatures.…”

Section: Introductionmentioning

confidence: 99%

Effects of metal doping agent on the properties of Nb₂₋_xM_xO₅ (M = Mn, Fe, and Ni) system

Raba

Barba-Ortega

Joya

2018

Int J Applied Ceramic Tech

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In order to improve the behavior Niobium pentoxide on oxidation‐reductionreactions to degrade organic compounds in aqueous solutions, we developed the synthesis of Niobium pentoxide with the metal doping agents: manganese,iron, and nickel (Nb2−xMxO5), respectively, and analyzing its effects on the structural and vibrational properties. The synthesis of the Nb2−xMxO5 (M = Mn, Fe, and Ni; x = 0.02 and 0.05) was performed according the Pechini method, but before the annealing, the samples were submitted to Thermogravimetric analysis study showing better pre‐calcination annealing temperatures at 500 and 700°C for the materials. Then, we performed the crystal structural analysis by X‐ray Diffraction, obtaining crystallite sizes between 15 and 47 nm, the accurate size analysis was calculated by Scherrer equation. Structural analysis was also performed by IR spectroscopy to evaluate the vibrational modes of synthetized samples. The dopping effects were evaluated by UV‐Vis spectrophotometry through the energy band gap values, showing that doped samples with manganese and iron had lower values than undoped, except the sample doped with nickel. However, samples doped with iron at 2.5% showed better photocatalytic performance.

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The effect of the preparation method of Nb2O5 oxide influences the performance of the photocatalytic activity

Cited by 32 publications

References 37 publications

Synthesis and Characterization of Nano-Particles of Niobium Pentoxide with Orthorhombic Symmetry

Synthesis and Characterization of Nano-Particles of Niobium Pentoxide with Orthorhombic Symmetry

Photocatalytic and Antibacterial Activity Studies of ZnO Nanoparticles Synthesized by Thermal Decomposition of Mechanochemically Processed Oxalate Precursor

Effects of metal doping agent on the properties of Nb₂₋_xM_xO₅ (M = Mn, Fe, and Ni) system

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The effect of the preparation method of Nb2O5 oxide influences the performance of the photocatalytic activity

Cited by 32 publications

References 37 publications

Synthesis and Characterization of Nano-Particles of Niobium Pentoxide with Orthorhombic Symmetry

Synthesis and Characterization of Nano-Particles of Niobium Pentoxide with Orthorhombic Symmetry

Photocatalytic and Antibacterial Activity Studies of ZnO Nanoparticles Synthesized by Thermal Decomposition of Mechanochemically Processed Oxalate Precursor

Effects of metal doping agent on the properties of Nb2−xMxO5 (M = Mn, Fe, and Ni) system

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Effects of metal doping agent on the properties of Nb₂₋_xM_xO₅ (M = Mn, Fe, and Ni) system