Effect of pH in the hydrothermal preparation of monoclinic tungsten oxide

Nagyné-Kovács, Teodóra; Lukács, István Endre; Szabó, Anna; Hernádi, Klára; Igricz, Tamás; László, Krisztina; Szilágyi, Imre Miklós; Pokol, György

doi:10.1016/j.jssc.2019.121044

Cited by 19 publications

(9 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In particular, WO 3 has a high oxidizing ability due to holes and has a good response to solar light (band gap of 2.5 to 3.0 eV). [18][19][20] However, WO 3 has a relatively low CB energy level and the photo-generated charge carriers can rapidly recombine. The construction of WO 3 and other semiconductors to form heterostructure photocatalysts has attracted substantial research interest for remarkably enhancing photocatalytic performance.…”

Section: Introductionmentioning

confidence: 99%

2D–2D WO₃–Bi₂WO₆ photocatalyst with an S-scheme heterojunction for highly efficient Cr(vi) reduction

et al. 2022

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

2D–2D WO₃–Bi₂WO₆ photocatalyst with an S-scheme heterojunction for highly efficient Cr(vi) reduction

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The band-gap energies of PWO-1.2 and WO 3 are calculated by the Kubelka-Munk transformation (αhν = A(hν-E g ) n/2 , where α, ν, E g , and A represent the absorbance, light frequency, band-gap energy, and a constant, respectively). [34] The n value depends on the characteristics of the transition in a semiconductor, and the n value of WO 3 is 1. [35] The band gaps of WO 3 and PWO-1.2 are 2.55 and 1.67 eV, respectively (Figure 5b).…”

Section: Chemistryselectmentioning

confidence: 99%

Construction of yolk‐shell structural polydopamine@WO₃ micro/nanospheres for enhanced photocatalytic degradation

et al. 2023

View full text Add to dashboard Cite

Polydopamine‐coated tungsten oxide (PDA@WO3) nanomaterial is synthesized by the polymerization of dopamine around the surface of WO3 to form the perfect yolk‐shell structures, and the optoelectronic properties and photocatalytic performance in the wide pH range are studied. After coating of PDA around the WO3 surface, as‐obtained PDA@WO3 possesses better light absorption, lower band gap, stronger photocurrent response, and lower resistance than pristine WO3. As a result, the improved photocatalytic ability of PDA@WO3 nanocomposites, by optimizing the amount of dopamine, is achieved. Compared with pristine WO3, PDA@WO3 exhibits better photocatalytic activity, and the degradation rate of methyl blue reaches 80.2 % (pH=5.4) and 94.5 % (pH=7.2) after 150 min. Combined band energy with trapping experiments of the active substance, photocatalytic activity and degradation mechanism are discussed. Originated from the π electron conjugation system of PDA and yolk‐shell structure of PDA@WO3, the mobility of photogenerated electrons increase and the recombination of electrons‐holes reduce that result in improvement of the photocatalytic performance of pristine WO3, implying surface‐modified metal oxide with yolk‐shell is a potential photocatalytic material for degradation in wide pH range.

show abstract

“…In the facile hydrothermal treatment -one-step and free of additives, several processing parameters that could be used as controlling parameters such as the acidity [9,18,19], reaction time [18,20,21], reaction temperature [18,[22][23][24]. By varying these parameters, researchers could manipulate the crystal structure and morphology of the products, which then affected the potential for applications.…”

Section: Introductionmentioning

confidence: 99%

Temperature-mediated Phase Transformation and Optical Properties of Tungsten Oxide Nanostructures Prepared by Facile Hydrothermal Method

Pham¹,

Luu

Nguyen

et al. 2022

Comm. in Phys.

View full text Add to dashboard Cite

Different tungsten oxide nanocrystals were synthesized via facile hydrothermal process – one-step and free of additives - at different reaction temperatures and a highly acidic environment. The phase transformation of samples, followed by the change of morphology and optical properties, was observed as the reaction temperature varied from room temperature to 220oC. The crystal phase transformed from monoclinic WO3∙2H2O to orthorhombic WO3∙H2O, then to monoclinic WO3 as the reaction temperature increased from room temperature to 100 ⁰C, then to 220 ⁰C. Corresponding to the phase transformation, the optical bandgap increased from 2.43 eV to 2.71 eV, and the morphology varied from nanoplate to nanocuboid. The effect of the reaction temperature on the phase transformation was assigned to the dehydration process, which became stronger as the reaction temperature increased. These results gave an insight into the phase transformation and implied a simple method for manipulating the crystal phase and morphology of tungsten oxide nanostructure for various applications.

show abstract

Effect of pH in the hydrothermal preparation of monoclinic tungsten oxide

Cited by 19 publications

References 66 publications

2D–2D WO₃–Bi₂WO₆ photocatalyst with an S-scheme heterojunction for highly efficient Cr(vi) reduction

2D–2D WO₃–Bi₂WO₆ photocatalyst with an S-scheme heterojunction for highly efficient Cr(vi) reduction

Construction of yolk‐shell structural polydopamine@WO₃ micro/nanospheres for enhanced photocatalytic degradation

Temperature-mediated Phase Transformation and Optical Properties of Tungsten Oxide Nanostructures Prepared by Facile Hydrothermal Method

Contact Info

Product

Resources

About

Effect of pH in the hydrothermal preparation of monoclinic tungsten oxide

Cited by 19 publications

References 66 publications

2D–2D WO3–Bi2WO6 photocatalyst with an S-scheme heterojunction for highly efficient Cr(vi) reduction

2D–2D WO3–Bi2WO6 photocatalyst with an S-scheme heterojunction for highly efficient Cr(vi) reduction

Construction of yolk‐shell structural polydopamine@WO3 micro/nanospheres for enhanced photocatalytic degradation

Temperature-mediated Phase Transformation and Optical Properties of Tungsten Oxide Nanostructures Prepared by Facile Hydrothermal Method

Contact Info

Product

Resources

About

2D–2D WO₃–Bi₂WO₆ photocatalyst with an S-scheme heterojunction for highly efficient Cr(vi) reduction

2D–2D WO₃–Bi₂WO₆ photocatalyst with an S-scheme heterojunction for highly efficient Cr(vi) reduction

Construction of yolk‐shell structural polydopamine@WO₃ micro/nanospheres for enhanced photocatalytic degradation