Preparation and characterization of supported bimetallic gold–iron nanoparticles, and its potential for heterogeneous catalysis

Ferouani, Ghaniya; Ameur, Nawal; Bachir, Redouane

doi:10.1007/s11164-019-04039-0

Cited by 20 publications

(16 citation statements)

References 49 publications

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“…The deconvolution all spectra showed the presence of an important absorption in the region 215–252 and 293–324 nm ( See Figure 4). Might be associated to the ligand–metal charge transfer between tetrahedral Ti 4+ and oxygenated ligand (such as: O 2− , O−H, O−Ti, or H 2 O) and the Ti 4+ cations in the octahedral environment, [4,42,45] respectively. In the case of X%V‐TiNTs materials, the bands corresponding to the titania species are still present with a small shift related to the interaction between Ti and V species [47] .…”

Section: Resultsmentioning

confidence: 99%

“…Figure 3 displays the RD/UV‐Vis spectra of the layered materials. All materials exhibit intense absorption at λ<400 nm related to titanium species [4,42,45] . The presence of vanadium in the case of X%V‐TiNTs materials leads a red shift of the absorbance.…”

Section: Resultsmentioning

confidence: 99%

“…All materials exhibit intense absorption at λ < 400 nm related to titanium species. [4,42,45] The presence of vanadium in the case of X%V-TiNTs materials leads a red shift of the absorbance. The red shift of absorption edge can be related to the transition of electrons from the valence band (O2p) to the t2 g level of V3d orbit as the radius of V is comparatively smaller than Ti (0.059 and 0.068 nm, respectively) which makes the Ti and O distance less important.…”

Section: Physicochemical Characterizationmentioning

confidence: 99%

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Enhanced Photocatalytic Degradation of Organic Pollutants and Anticorrosion of Mild Steel by Vanadium Modified Titanate Nanotubes (X%V‐TiNTs)

Ameur

Brahimi²,

Bensaada³

et al. 2020

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The present work aims to study the anticorrosion and the photodegradation properties of titanate nanotubes (TiNTs) and vanadium doped-titanate nanotubes (V-TiNTs). Moreover, this article seeks to investigate the effect of doping TiNTs by vanadium species at different amount (2, 5 and 10 wt %). The raw materials (i.e:TiO 2 and V 2 O 5-TiO 2) are obtained by a sol gel process, while the hydrothermal treatment is chosen to achieve the hollow structure. The structural evolutions and morphological characteristics of materials have performed using various techniques such as: Scanning Electron Microscopy and Energy Dispersive X-ray (MEB/EDS), X-ray diffraction (XRD), UV-Visible in Reflection Diffuse spectroscopy (RD/UV-Vis) and Fourier Transform InfraRed spectroscopy (FTIR) analysis. However , the anticorrosion properties of the synthesized nanotubes are evaluated on mild steel corrosion in 1 N HCl using a weight loss method. All materials showed a potential inhibitor effect (up to 90 %) depending on the vanadium percentage and the inhibitor concentration. The photodegradation activity of the prepared materials is evaluated in the photodegradation of two organic pollutants: Methylene Blue (MB) and Malachite Green (MG) under UV-Visible irradiation. The obtained results underlined the improvement of photocatalytic activity of TiNTs by vanadium species. A conversion rate up to 96 % is achieved at reduced time. Therefore, the prepared materials could be suitable for the anticorrosion of mild steel and the photodegradation of organic pollutants.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Physicochemical Characterizationmentioning

confidence: 99%

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Enhanced Photocatalytic Degradation of Organic Pollutants and Anticorrosion of Mild Steel by Vanadium Modified Titanate Nanotubes (X%V‐TiNTs)

Ameur

Brahimi²,

Bensaada³

et al. 2020

ChemistrySelect

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“…Titania may be used as a semiconductor that is biocompatible, cheap, eco‐friendly, with an important band gap energy, stable phases, etc. . Furthermore, nano‐structured titania possesses some physico‐chemical characteristics, such as the crystal structure, melting temperature, solubility, band gap energy, acid‐base character, surface area, electric charges and others, that are different from those encountered in the conventional form .…”

Section: Introductionmentioning

confidence: 99%

Study of 1D Titanate‐Based Materials –New Modification of the Synthesis Procedure and Surface Properties‐Recent Applications

Ameur

Bachir

2020

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This paper represents a general study of titanate nanotubes (TiNTs) which are among the most important materials in the field of catalysis. This research work covers more than 100 publications about the formulation, characterisation and most recent applications of TiNTs. TiNTs can be prepared by different methods, namely the anodic deposition, sol-gel template synthesis and alkaline hydrothermal treatment. The present study focuses on the preparation of this tubular structure by alkaline treatment, using the latest and most recent processes that have been introduced in this method (stirring, acid nature, annealing temperature, etc). The surface properties, such as the point of zero charge (P.Z.C), acid-base nature and light absorption, of TiNTs are also evoked. In the end, some recent and important TiNTs applications in the field of renewable energies are reported (H 2 production and methanation). In addition, NO reduction, CO oxidation, photocatalysis and organic synthesis are also mentioned. Therefore, it may be said that this paper is a structured study about TiNTs for the purpose of making the reader aware of their importance, understand their synthesis, and know their scope of applications. To conclude, the most important data, acquired through various characterization techniques, are provided.[a] Dr.

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“…A significant absorption was noted in the intervals 209-215, 232-244, 264-299 and 321-332 nm. They can be related to the charge transfer between tetrahedral Ti 4+ and oxygenated ligand like: O 2-, O-H, O-Ti or even H2O and to the Ti 4+ cations in an octahedral environment[8,38,40]. Ce-TiNTs showed a band at 402 nm.…”

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confidence: 99%

WITHDRAWN: Application of doped-titanate nanotubes in (1) the photodegradation of Tannic Acid, Methyl Orange and Malachite Green and (2) the inhibition of bacteria and fungus .

Bouayed¹,

Ameur²,

Brahimi³

et al. 2021

Preprint

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The purpose of this article is to study the photocatalytic properties of doped titanate nanotubes prepared by hydrothermal treatment using different metals: Ce, Fe, Zn and Zr at 2 wt% content. The textural and morphological properties of the nanopowders were determined by different analysis techniques such as: XRD, RD/UV–Vis, FTIR and TG-DTA. The results of the characterizations showed that nanotubes can be obtained with a hollow structure, and an important thermal stability of whatever element nature. However, the photocatalytic activity ends with the photodegradation under UV-Visible irradiation of the three industrial molecules: Malachite Green, Methyl Orange and Tannic Acid having different molecule charges. It was noted that the degradation rates of the order of 98% were obtained in fairly short times. The final results obtained revealed that the dopant nature and the solution pH play a major role in determining the photocatalytic degradation of pollutants using TiNTs. However the application of TiNTs and doped TiNTs show that these materials have an inhibitory power of fungi and bacteria quite important.

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Preparation and characterization of supported bimetallic gold–iron nanoparticles, and its potential for heterogeneous catalysis

Cited by 20 publications

References 49 publications

Enhanced Photocatalytic Degradation of Organic Pollutants and Anticorrosion of Mild Steel by Vanadium Modified Titanate Nanotubes (X%V‐TiNTs)

Enhanced Photocatalytic Degradation of Organic Pollutants and Anticorrosion of Mild Steel by Vanadium Modified Titanate Nanotubes (X%V‐TiNTs)

Study of 1D Titanate‐Based Materials –New Modification of the Synthesis Procedure and Surface Properties‐Recent Applications

WITHDRAWN: Application of doped-titanate nanotubes in (1) the photodegradation of Tannic Acid, Methyl Orange and Malachite Green and (2) the inhibition of bacteria and fungus .

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