Dependence of photoactivity of niobium pentoxide (Nb2O5) on crystalline phase and electrokinetic potential of the hydrocolloid

Kumari, Neha; Gaurav, Kumar; Samdarshi, S.K.; Bhattacharyya, A. S.; Paul, Samrat; Rajbongshi, Biju Mani; Mohanty, Kaustubha

doi:10.1016/j.solmat.2020.110408

Cited by 39 publications

(24 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The band gap energy was obtained applying the Kubelka-Munk model. 44 For the evaluation of the photocatalytic properties, as well as the evaluation of the reuse capacity of the immobilized semiconductors, six cycles of photocatalysis were carried out for each of the samples, following the proposed model: initially, a 5 mg/L solution of RhB (Synth) was prepared; then, 25 mL aliquots of this solution were separated and placed in 100 mL beakers, in which the samples were immersed. A control beaker was also prepared, containing only the RhB solution.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

ZnO semiconductors obtained by slip casting: Application and reuse in photocatalysis

Domingos

Ruellas

Peçanha

et al. 2021

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

With industrial and technological advances, it has been increasingly possible to raise the production capacity of essential items for various activities, in addition to promoting comfort and safety for people. However, human actions cause society to face several environmental problems, which are increasingly the target of global concern in all areas, especially in the scientific community. Among these problems is the high and constant worldwide use of dyes, mostly associated with the textile industry, since the demand for clean water is high, 1,2 mainly in the dyeing stage,

show abstract

Section: Methodsmentioning

confidence: 99%

“…Diffuse reflectance spectra (DRS) in the ultraviolet–visible (UV–Vis) region were performed between 200 and 1200 nm at room temperature in the diffuse reflectance mode, using a Shimadzu UV–Vis equipment for the band gap values determination. The band gap energy was obtained applying the Kubelka–Munk model 44 …”

Section: Methodsmentioning

confidence: 99%

ZnO semiconductors obtained by slip casting: Application and reuse in photocatalysis

Domingos

Ruellas

Peçanha

et al. 2021

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

show abstract

“…[33a] Previously, TT-Nb 2 O 5 exhibited a higher SSA and reactivity than those of T-Nb 2 O 5 and H-Nb 2 O 5 . [9e, 70,135] Whereas, some research groups found that T-Nb 2 O 5 and H-Nb 2 O 5 showed higher activity than that of TT-Nb 2 O 5 in photodegradation of methylene e) electrochemical impedance spectroscopy, [9e] and f) photoluminescence spectroscopy of Nb 2 O 5 -based catalysts. [105b] g) The charge migration on CeO 2 .…”

Section: The Role Of Size and Crystalline Phasesmentioning

confidence: 99%

“…Previously, TT‐Nb 2 O 5 exhibited a higher SSA and reactivity than those of T‐Nb 2 O 5 and H‐Nb 2 O 5 . [ 9e,70,135 ] Whereas, some research groups found that T‐Nb 2 O 5 and H‐Nb 2 O 5 showed higher activity than that of TT‐Nb 2 O 5 in photodegradation of methylene blue and selective oxidation of 5‐hydroxymethylfurfural (Table 4, No. 9).…”

Section: The Structure–activity Relationshipmentioning

confidence: 99%

See 1 more Smart Citation

Nb₂O₅‐Based Photocatalysts

et al. 2021

View full text Add to dashboard Cite

Photocatalysis is one potential solution to the energy and environmental crisis and greatly relies on the development of the catalysts. Niobium pentoxide (Nb 2 O 5 ), a typically nontoxic metal oxide, is eco-friendly and exhibits strong oxidation ability, and has attracted considerable attention from researchers. Furthermore, unique Lewis acid sites (LASs) and Brønsted acid sites (BASs) are observed on Nb 2 O 5 prepared by different methods. Herein, the recent advances in the synthesis and application of Nb 2 O 5 -based photocatalysts, including the pure Nb 2 O 5 , doped Nb 2 O 5 , metal species supported on Nb 2 O 5 , and other composited Nb 2 O 5 catalysts, are summarized. An overview is provided for the role of size and crystalline phase, unsaturated Nb sites and oxygen vacancies, LASs and BASs, dopants and surface metal species, and heterojunction structure on the Nb 2 O 5 -based catalysts in photocatalysis. Finally, the challenges are also presented, which are possibly overcome by integrating the synthetic methodology, developing novel photoelectric characterization techniques, and a profound understanding of the local structure of Nb 2 O 5 .

show abstract

Role of Nb₂O₅ Crystal Phases on the Photocatalytic Conversion of Lignin Model Molecules and Selectivity for Value‐Added Products

Rojas,

Rafaela,

Espinoza‐Villalobos

et al. 2024

ChemSusChem

View full text Add to dashboard Cite

The photocatalytic conversion in aqueous media of phenol and guaiacol as a lignin model compound using Nb2O5 with different crystal phases was studied. Nb2O5 particles were synthesized using hydrothermal methods, where it was observed that changes in the solvent control their morphology and crystal phase. Different photocatalytic behavior of Nb2O5 was observed with the selected model compounds, indicating that its selection directly impacts the resulting conversion and selectivity rates as well as the reaction pathway, highlighting the relevance of model molecule selection. Photocatalytic conversion of phenol showed conversion rate (C%) up to 25% after 2 h irradiation and high selectivity (S%) to pyrogallol (up to 50%). Orthorhombic Nb2O5 spheres favored conversion through free hydroxyl radicals while monoclinic rods did not convert phenol. Guaiacol photocatalytic oxidation showed high conversion rate but lower selectivity. Orthorhombic and monoclinic Nb2O5 favored the formation of resorcinol with S%~0.43% (C%~33%) and ~13% (C%~27%) respectively. The mixture of both phases enhanced the guaiacol conversion rate to ~55% with ~17% of selectivity to salicylaldehyde. The use of radical scavengers provided information to elucidate the reaction pathway for these model compounds, showing that different reaction pathways may be obtained for the same photocatalyst if the model compound is changed.

show abstract

Dependence of photoactivity of niobium pentoxide (Nb2O5) on crystalline phase and electrokinetic potential of the hydrocolloid

Cited by 39 publications

References 56 publications

ZnO semiconductors obtained by slip casting: Application and reuse in photocatalysis

ZnO semiconductors obtained by slip casting: Application and reuse in photocatalysis

Nb₂O₅‐Based Photocatalysts

Role of Nb₂O₅ Crystal Phases on the Photocatalytic Conversion of Lignin Model Molecules and Selectivity for Value‐Added Products

Contact Info

Product

Resources

About

Dependence of photoactivity of niobium pentoxide (Nb2O5) on crystalline phase and electrokinetic potential of the hydrocolloid

Cited by 39 publications

References 56 publications

ZnO semiconductors obtained by slip casting: Application and reuse in photocatalysis

ZnO semiconductors obtained by slip casting: Application and reuse in photocatalysis

Nb2O5‐Based Photocatalysts

Role of Nb2O5 Crystal Phases on the Photocatalytic Conversion of Lignin Model Molecules and Selectivity for Value‐Added Products

Contact Info

Product

Resources

About

Nb₂O₅‐Based Photocatalysts

Role of Nb₂O₅ Crystal Phases on the Photocatalytic Conversion of Lignin Model Molecules and Selectivity for Value‐Added Products