Preparation of iron tungstate (FeWO4) nanosheets by hydrothermal method

Kovács, Teodóra Nagyné; Pokol, György; Gáber, Fanni; Nagy, D.; Igricz, Tamás; Lukács, István Endre; Fogarassy, Zsolt; Balázsi, Katalin; Szilágyi, Imre Miklós

doi:10.1016/j.materresbull.2017.08.031

Cited by 35 publications

(27 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…9 ). The advantages of a hierarchical structure for the enhanced photocatalytic activity of MWO 4 are supported by several research groups [ 108 – 111 ]. Chen et al [ 112 ] prepared FeWO 4 microspheres by using an ethylene glycol-assisted solvothermal approach, in which ionic1-octyl-3-methylimidazolium tetrachloroferrate was used as one of the starting materials and played an important role as both a reactant and template.…”

Section: Strategies For Enhanced Photocatalytic Activitymentioning

confidence: 99%

“…For example, 1D CdWO 4 NRs were prepared using microwave or hydrothermal approaches and exhibited excellent photocatalytic activity for environmental treatments, as compared to nanoparticles [ 121 – 123 ]. Kovacs and co-workers [ 111 ] prepared a series of FeWO 4 with different morphologies, including nanoparticles, NRs, and nanosheets, by varying the Fe precursors. The nanosheet-like FeWO 4 with band-gap energy of ~ 2.2 eV exhibited excellent absorption ability throughout the UV and visible-light range, which was attributed to the formation of a cavity assembled by nanosheets that resulted in enhanced photon harvest.…”

Section: Strategies For Enhanced Photocatalytic Activitymentioning

confidence: 99%

See 1 more Smart Citation

Nanostructured Ternary Metal Tungstate-Based Photocatalysts for Environmental Purification and Solar Water Splitting: A Review

et al. 2018

View full text Add to dashboard Cite

Visible-light-responsive ternary metal tungstate (MWO4) photocatalysts are being increasingly investigated for energy conversion and environmental purification applications owing to their striking features, including low cost, eco-friendliness, and high stability under acidic and oxidative conditions. However, rapid recombination of photoinduced electron–hole pairs and a narrow light response range to the solar spectrum lead to low photocatalytic activity of MWO4-based materials, thus significantly hampering their wide usage in practice. To enable their widespread practical usage, significant efforts have been devoted, by developing new concepts and innovative strategies. In this review, we aim to provide an integrated overview of the fundamentals and recent progress of MWO4-based photocatalysts. Furthermore, different strategies, including morphological control, surface modification, heteroatom doping, and heterojunction fabrication, which are employed to promote the photocatalytic activities of MWO4-based materials, are systematically summarized and discussed. Finally, existing challenges and a future perspective are also provided to shed light on the development of highly efficient MWO4-based photocatalysts.

show abstract

Section: Strategies For Enhanced Photocatalytic Activitymentioning

confidence: 99%

Section: Strategies For Enhanced Photocatalytic Activitymentioning

confidence: 99%

Nanostructured Ternary Metal Tungstate-Based Photocatalysts for Environmental Purification and Solar Water Splitting: A Review

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Metal tungstates are compounds composed of metal cations and tungstate (WO 4 2− ) anions which can be engineered to from nanostructures such as tin tungstate, iron tungstate nanosheets, and various tungstate nanowires and nanospheres . An early study by Dong et al presented the potential use of manganese tungstate (MnWO 4 ) as CT and MRI contrast .…”

Section: Metal Oxide Nanomaterials As Imaging Contrast Agentsmentioning

confidence: 99%

Advances in Applications of Metal Oxide Nanomaterials as Imaging Contrast Agents

Anderson

Fahmi

2019

Physica Status Solidi (a)

View full text Add to dashboard Cite

Medical diagnosis relies on imaging modalities to reveal abnormalities in organs or existence of tumorous lesion. Application of contrast agents alongside imaging techniques is essential in order to obtain high contrast images with distinguishable features. Contrast agents delivered and accumulated in target sites can enhance local signal generation and solve the inherent lack of contrast in imaging techniques. As such, various contrast agents are developed for modalities like computed tomography (CT), magnetic resonance imaging (MRI), and photoacoustic imaging (PAI). For many of these techniques, metal-based agents possess the desired properties for signal and contrast enhancement. Metal oxide nanomaterials present a simple platform for metalbased contrast agents with tunable structure, magnetic and optical properties, surface chemistry, and pharmacokinetics. These can be controlled through synthesis, redox reactions, and surface modification to produce desirable nanoparticles. In this review, recent advances in the development of metal oxide imaging agents are highlighted. Various metal oxide species are discussed, including iron oxides, gadolinium oxides, manganese oxides, tungsten oxides and bronzes, molybdenum oxides, and other oxides of titanium, tantalum, etc. Imaging capability and performance of these metal oxides are presented, and novel functionalization strategies are presented. Finally, recommendations for future research in this area are proposed.

show abstract

“…They were used under the same conditions adding them alone to the solution or more of them at same time. We applied oxalic acid as an additive material as well beside the above listed chemicals since it improved the crystallinity of the obtained product [26]. We carried out the reactions at 180 and 200 °C to analyze the role of the temperature.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Anions Upon the WO₃ Morphology and Structure

Nagyné-Kovács

Malik

Szenkovits

et al. 2019

j nanosci nanotechnol

Self Cite

View full text Add to dashboard Cite

In this study the effects of various anions (SO4 2-, ClO4and PO4 3-) were investigated on the hydrothermal treatment of WO3 from Na2WO4 and HCl at 180 and 200 °C. The products were analyzed by XRD and SEM. With the usage of SO4 2the obtained product was hexagonal (h-) WO3 in the form of nanorods at both temperatures. Applying ClO4resulted in a mixture of WO3•0.33 H2O and small amount of m-WO3 at 180 °C and pure WO3•0.33 H2O at 200 °C. The morphology was consisted of cuboid shapes arranged into spherical structures at 180 °C and longitudinal ones at 200 °C. By the application of PO4 3no product formed at either temperature. Using the combination of SO4 2-, and ClO4the product was h-WO3 at both 180 and 200 °C with rod-like crystals; thus, the effect of ClO4was overdominated by the SO4 2ions. Utilization of PO4 3together with SO4 2-, and/or ClO4resulted again in no product, meaning that adding PO43to the reaction mixture completely blocks the hydrothermal formation of solid products by forming water soluble phosphotungstic acids.

show abstract

Preparation of iron tungstate (FeWO4) nanosheets by hydrothermal method

Cited by 35 publications

References 36 publications

Nanostructured Ternary Metal Tungstate-Based Photocatalysts for Environmental Purification and Solar Water Splitting: A Review

Nanostructured Ternary Metal Tungstate-Based Photocatalysts for Environmental Purification and Solar Water Splitting: A Review

Advances in Applications of Metal Oxide Nanomaterials as Imaging Contrast Agents

Effect of Different Anions Upon the WO₃ Morphology and Structure

Contact Info

Product

Resources

About

Preparation of iron tungstate (FeWO4) nanosheets by hydrothermal method

Cited by 35 publications

References 36 publications

Nanostructured Ternary Metal Tungstate-Based Photocatalysts for Environmental Purification and Solar Water Splitting: A Review

Nanostructured Ternary Metal Tungstate-Based Photocatalysts for Environmental Purification and Solar Water Splitting: A Review

Advances in Applications of Metal Oxide Nanomaterials as Imaging Contrast Agents

Effect of Different Anions Upon the WO3 Morphology and Structure

Contact Info

Product

Resources

About

Effect of Different Anions Upon the WO₃ Morphology and Structure