Zn-doped Nb2O5 photocatalysts driven by visible-light: An experimental and theoretical study

Oliveira, Jéssica A.; Reis, M.O. Braga; Pires, Marcus Sandes; Ruotolo, Luís A.M.; Ramalho, Teodorico C.; Ribeiro, Cauê; Lacerda, Lívia C. T.; Nogueira, Francisco Guilherme Esteves

doi:10.1016/j.matchemphys.2019.02.062

Cited by 37 publications

(5 citation statements)

References 41 publications

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“…Similar behavior was obtained in our work, where the Nb 2 O 5 had good photocatalytic performance. On the other hand, Zn-doped Nb 2 O 5 photocatalysts, obtained through the oxidant peroxide method, exhibited a diffraction pattern of Nb 2 O 5 orthorhombic-type phase [26]. These materials exhibited better crystallinity, high specific surface area and low band gap values, so zinc improved the photocatalytic activity of Nb 2 O 5 in Rhodamine B and caffeic acid degradation.…”

Section: Photocatalytic Performancementioning

confidence: 99%

Niobium Pentoxide Samples with Addition of Manganese at Different Concentrations and Calcination Temperatures Applied in the Photocatalytic Degradation of Rhodamine B

et al. 2020

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In order to improve the photocatalytic effect of Nb2O5, manganese from 1% to 10% was added by the polymeric precursor’s method. The samples obtained were subjected to different calcination temperatures from 400 to 700 °C. Characterization of the synthesized materials was performed by XRD, IR, Raman and Diffuse Reflectance Spectroscopy (DRS) spectroscopy, FE-SEM, Brunauer–Emmett–Teller (BET) method, Photoluminescence (PL) and Dynamic Light Scattering (DLS). Photocatalytic performance for degradation of Rhodamine B was also evaluated. The Rietveld refined X-Ray Diffraction (XRD) pattern of Nb2O5:Mn 1.0 wt.% (700 °C) sample was similar to that of the un-doped oxide, therefore indicating that Nb was replaced by Mn and, consequently, there are not significant variations in the oxide structure. The Nb2O5:Mn 10.0 wt.% (700 °C) sample has the lowest band gap energy. The specific surface area (SBET) PL value increased as manganese concentration increased. The Nb2O5:Mn 5.0 wt.% (700 °C) sample has an Eg of 3.15 eV and morphological and surface characteristics that made it an appropriate photocatalyst in the Rhodamine B degradation. The novelty of this work relies on the use of a small quantity of Mn ions as dopants leading to Nb2O5:Mn nanostructured particles without using any surfactant or other additives.

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Section: Photocatalytic Performancementioning

confidence: 99%

Niobium Pentoxide Samples with Addition of Manganese at Different Concentrations and Calcination Temperatures Applied in the Photocatalytic Degradation of Rhodamine B

et al. 2020

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“…The calculations in this study were done through the CASTEP module in the Materials Studio calculation software based on density functional theory (DFT) [12,13]. In the calculation of FeNb 2 O 6 , the DFT method used Perdew Burke and Erzerhof (PBE) and GGA (generalized gradient approximation) for the exchange correlation function [14], and UItrasoft pseudopotential was used to describe the interaction between electrons. When calculating the core-level spectrum, On the fly was used to describe the interaction between electrons [11].…”

Section: Calculation Methodsmentioning

confidence: 99%

Interfacial Structure Change and Selective Dissolution of Columbite–(Fe) Mineral during HF Acid Leaching

Yang

Wang

et al. 2021

Minerals

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The goal of the paper is to study the charge transfer and reactions at the columbite-(Fe) (FeNb2O6) mineral surface during the HF leaching process. In this paper, X-ray photoelectron spectroscopy (XPS), leaching experiments, and density functional theory (DFT) calculations were used to study the surface element adsorption, charge distribution, chemical state, and energy changes of the mineral surface during the process of leaching columbite–(Fe) with different concentrations of hydrofluoric acid. The results showed that as the concentration of F atoms was increased during the acid leaching process, the Nb–O bond was more likely to be broken than the Fe–O bond; the amount of charge transferred from Nb atom to F atom (0.78 e–0.94 e/atom) was greater than that from Fe atom to the F atom (0.25 e–0.28 e/atom), so it was determined that compared to Fe atoms, it was easier for the Nb atoms to bind to F. The results of XPS analysis showed that the electron binding energies of Nb5+–O, Fe3+–O, and Fe2+–O bonds on the mineral surface increased sequentially, and the M–O bond broke during the acid leaching process, forming more stable M–F bonds. Therefore, the Nb5+–F bonds were easier to form a stable structure. Combined with the ICP results, it was found that in the filtrate after 5M HF and 10M HF acid leaching minerals, c(Nb)/c(Fe) were 2.69 and 2.95, respectively, and the concentration ratio of Nb to Fe element in the mineral was 2 which was lower than 2.69 and 2.95, confirming the result of DFT calculation and illustrating that Nb atoms in columbite-(Fe) mineral were more soluble than Fe atoms.

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“…However, the bandgap width of Nb 2 O 5 is 3.4eV, which limits its application as it can only utilize visible light in sunlight. In order to further improve the photocatalytic activity of Nb 2 O 5 , researchers have adopted methods such as doping [10][11][12][13], precious metal deposition [14][15][16], and semiconductor composite [17][18][19]to modify it. Previously, we have successfully prepared C doped Nb 2 O 5 with excellent photocatalytic activity under visible light using ethanol and acetic acid as carbon sources [20].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of corn straw based carbon doped Nb 2 O 5 as photocatalysts for Rhodamine B degradation under visible light illumination

Ding,

Zeng,

Wang

et al. 2024

Preprint

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Developing efficient visible light photocatalytic materials has always been a challenge for researchers. We have successfully prepared a series of corn straw based carbon doped Nb2O5 with excellent photocatalytic performance under visible light. A series of characterizations were carried out on the synthesized materials, including power X-Ray diffraction(XRD), scan electron miscopy (SEM), nitrogen adsorption, infrared spectroscopy(IR), UV-vis diffuse reflectance spectra, X-ray photoelectron spectroscopy(XPS). The photocatalytic performance of the synthesized samples was investigated under visible light irradiation using Rhodamine B as the degradation target. The experimental results show that the introduction of carbon element has a certain impact on the morphology, specific surface area, pore size distribution, elemental composition, functional groups, and visible light absorption of the sample, which in turn has a significant impact on its photocatalytic performance.This article is of great significance for the application of biomass materials and the improvement of environmental quality, and also provides new ideas for the design and synthesis of new composite functional materials.

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Zn-doped Nb2O5 photocatalysts driven by visible-light: An experimental and theoretical study

Cited by 37 publications

References 41 publications

Niobium Pentoxide Samples with Addition of Manganese at Different Concentrations and Calcination Temperatures Applied in the Photocatalytic Degradation of Rhodamine B

Niobium Pentoxide Samples with Addition of Manganese at Different Concentrations and Calcination Temperatures Applied in the Photocatalytic Degradation of Rhodamine B

Interfacial Structure Change and Selective Dissolution of Columbite–(Fe) Mineral during HF Acid Leaching

Synthesis of corn straw based carbon doped Nb 2 O 5 as photocatalysts for Rhodamine B degradation under visible light illumination

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