Synthesis of g-C 3 N 4 /Nb 2 O 5 heterostructures and their application in the removal of organic pollutants under visible and ultraviolet irradiation

Carvalho, Kele T. G.; Nogueira, André E.; Lopes, Osmando F.; Byzynski, Gabriela; Ribeiro, Cauê

doi:10.1016/j.ceramint.2016.11.063

Cited by 55 publications

(24 citation statements)

References 42 publications

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“…The direct bandgap is estimated by making the value of (αhν) 2 in Y‐axis as a function of hν in X‐axis and extrapolation of the straight‐line portion to (αhν) 2 = 0 as shown in Figure . The calculated band gap energies of g‐C 3 N 4 , Nb 2 O 5 and CN‐NbO approximately 2.7, 3.2, and 2.65 eV, respectively, are more consistent with the literature …”

Section: Resultssupporting

confidence: 90%

“…To overcome the drawbacks, a number of g‐C 3 N 4 based heterojunctions photocatalysts have been recently successfully developed for enhancing photocatalytic activity such as g‐C 3 N 4 /TiO 2 , g‐C 3 N 4 /WO 3 , g‐C 3 N 4 /ZnFe 2 O 4 , g‐C 3 N 4 /ZnO, g‐C 3 N 4 /Ag 3 PO 4 , g‐C 3 N 4 /BiPO 4 , g‐C 3 N 4 /Bi 2 WO 6 , g‐C 3 N 4 /CdS, g‐C 3 N 4 /NiO, g‐C 3 N 4 /Cu 2 O, g‐C 3 N 4 /Fe 3 O 4 , g‐C 3 N 4 /MoS 2 . Among them g‐C 3 N 4 /Nb 2 O 5 shows some outstanding properties including a high surface area, high absorption coefficient, strength of surface acid sites, bandgap value ranging from 3.1 to 4.0 eV, and sufficient photoactive nature . Moreover, the bandgap edge of Nb 2 O 5 (E CB = ‐ 0.51 eV, E VB = 2.61 eV) can consistent well with g‐C 3 N 4 (E CB= ‐1.12 eV, E VB = 1.58 eV) to form a heterointersection system that can enable charge carrier separation and lead to improved photocatalytic activity …”

Section: Introductionmentioning

confidence: 99%

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Pyrolysis‐Synthesized g‐C₃N₄/Nb₂O₅ Nanocomposite for Enhanced Photocatalytic Activity under White LED Light Irradiation

et al. 2019

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The design and fabrication of highly active visible‐light‐driven photocatalysts have been received considerable attention in recent years. However, individual component‐based photocatalysts are limited in their use because of the high recombination of photoinduced carriers and poor chemical stability. Herein, the Z‐scheme‐originated photocatalytic activity of in‐situ deposited Nb2O5 NPs on the plane surface of carbon nitride (g‐C3N4) nanosheets (i. e. CN‐NbO) heterostructures was studied using a simple thermal pyrolysis method. The as‐synthesized photocatalysts distinctly manifested efficient white light‐emitting diode (LED) light irradiation toward organic malachite green (MG) dye degradation and photocatalytic hydrogen generation. The CN‐NbO heterostructure showed a faster degradation rate of the MG dye and a higher photocatalytic hydrogen evolution rate. In addition, the plausible Z‐scheme photocatalytic mechanism for photocatalytic hydrogen production under LED light irradiation was discussed. Photoelectrochemcial studies showed that the superior photoactivity of CN‐NbO heterostructure is mainly a result of the suitable alignment of the band edge positions, which diminish carrier recombination and facilitate efficient interfacial charge transport at their interface. This study provides an ideal method for in‐situ fabrication of novel two dimensional/one dimension‐based photocatalysts with high activity and stable performance for photocatalytic hydrogen generation.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Pyrolysis‐Synthesized g‐C₃N₄/Nb₂O₅ Nanocomposite for Enhanced Photocatalytic Activity under White LED Light Irradiation

et al. 2019

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“…However, the use of 5.0 g of melamine resulted in the formation of another phase that was identified as graphitic carbon nitride (g‐C 3 N 4 ) (JCPDS card no. 87‐1526), which was the predominant phase in this sample.…”

Section: Resultsmentioning

confidence: 82%

Synthesis of ZnO Nanoparticles Assisted by N Sources and their Application in the Photodegradation of Organic Contaminants

Silva

Carvalho²,

Lopes

et al. 2017

ChemCatChem

Self Cite

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A modified polymeric precursor method assisted by N sources (urea or melamine) was used to obtain anion‐doped ZnO nanoparticles. The influence of these molecules on the physical‐chemical and photocatalytic properties of the as‐synthesized samples was investigated. The ZnO nanoparticles exhibited a hexagonal wurtzite phase and crystallite sizes of approximately 20 nm. The addition of urea or melamine to the Zn2+ precursor solution improved the surface properties of the materials and resulted in controlled growth of the N‐doped ZnO nanoparticles, with urea showing superior performance for this purpose. These changes led to improved photocatalytic performance in the degradation of methylene blue (MB) dye and ethionamide antibiotic under UVC irradiation. It was observed that the indirect mechanism involving .OH radical attack played the main role in both photodegradation reactions catalyzed by the as‐synthesized ZnO samples, whereas the photosensitization mechanism had a negligible influence. The use of ESI‐MS analyses showed that the MB dye molecules were broken up by the action of the ZnO photocatalyst, indicating the occurrence of a mineralization process.

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“…Because of the low g-C3N4 content, there is no obvious difference of the XRD patterns between BiFeO3/g-C3N4 heterostructures and pure BiFeO3 can be seen in Fig. 1 (a) [22,26,27].…”

Section: Pyrocatalytic Dye Decompositionmentioning

confidence: 99%

The Enhanced Pyrocatalysis of the Pyroelectric BiFeO3/g-C3N4 Heterostructure for Dye Decomposition Driven by Cold-hot Temperature Alternation

Chen

Yao

et al. 2020

Preprint

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The BiFeO3/g-C3N4 heterostructure, which is fabricated via a simple mixing-calcining method, benefits the significant enhancement of the pyrocatalytic performance. With the growth of the g-C3N4 content in the heterostructure pyrocatalysts from 0 to 25 %, the decomposition ratio of Rhodamine B (RhB) dye after 18 cold-hot temperature fluctuation (25 oC - 65 oC) cycles increases at first and then decreases, reaching a maximum value of ~ 94.2 % at 10% while that of the pure BiFeO 3 is ~ 67.7 %. The enhanced dye decomposition may be due to the fabrication of the heterostructure which strengthens the separation of the positive and negative carriers and further accelerates their migration. The intermediate products in the pyrocatalytic reaction also have been detected and confirmed, which proves the key role of the pyroelectric effect in realizing the dye decomposition using BiFeO3/g-C3N4 heterostructure catalyst. The pyroelectric BiFeO3/g-C3N4 heterostructure shows the potential application in pyrocatalytically degrading dye wastewater.

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Synthesis of g-C 3 N 4 /Nb 2 O 5 heterostructures and their application in the removal of organic pollutants under visible and ultraviolet irradiation

Cited by 55 publications

References 42 publications

Pyrolysis‐Synthesized g‐C₃N₄/Nb₂O₅ Nanocomposite for Enhanced Photocatalytic Activity under White LED Light Irradiation

Pyrolysis‐Synthesized g‐C₃N₄/Nb₂O₅ Nanocomposite for Enhanced Photocatalytic Activity under White LED Light Irradiation

Synthesis of ZnO Nanoparticles Assisted by N Sources and their Application in the Photodegradation of Organic Contaminants

The Enhanced Pyrocatalysis of the Pyroelectric BiFeO3/g-C3N4 Heterostructure for Dye Decomposition Driven by Cold-hot Temperature Alternation

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Synthesis of g-C 3 N 4 /Nb 2 O 5 heterostructures and their application in the removal of organic pollutants under visible and ultraviolet irradiation

Cited by 55 publications

References 42 publications

Pyrolysis‐Synthesized g‐C3N4/Nb2O5 Nanocomposite for Enhanced Photocatalytic Activity under White LED Light Irradiation

Pyrolysis‐Synthesized g‐C3N4/Nb2O5 Nanocomposite for Enhanced Photocatalytic Activity under White LED Light Irradiation

Synthesis of ZnO Nanoparticles Assisted by N Sources and their Application in the Photodegradation of Organic Contaminants

The Enhanced Pyrocatalysis of the Pyroelectric BiFeO3/g-C3N4 Heterostructure for Dye Decomposition Driven by Cold-hot Temperature Alternation

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Pyrolysis‐Synthesized g‐C₃N₄/Nb₂O₅ Nanocomposite for Enhanced Photocatalytic Activity under White LED Light Irradiation

Pyrolysis‐Synthesized g‐C₃N₄/Nb₂O₅ Nanocomposite for Enhanced Photocatalytic Activity under White LED Light Irradiation