Influence of cationic doping at different sites in NaNbO3 on the photocatalytic degradation of methylene blue dye

Jana, Runia; Gupta, Aayush; Choudhary, Raveena; Pandey, O. P.

doi:10.1007/s10971-020-05365-1

Cited by 22 publications

(6 citation statements)

References 38 publications

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“…The occurrence of broad sub-bands instead of narrow energy levels originated from disordered crystal lattices introduced by Mn-doping and oxygen non-stoichiometry. The absorption bands (Figure 2, 3, and 4) are shifted in relation to the E gap values determined from the Tauc plot (Equation ( 6), (7), and (8); Figure 5, 7, and 9). However, the E gap values have been estimated from the plots interpolation toward lower energy hv.…”

Section: Discussionmentioning

confidence: 88%

“…[5,6] Energy gap engineering is necessary to overcome such limitations. [7][8][9][10][11][12] There is growing interest in NaNbO 3 applications:photovoltaic [13][14][15] and photocatalytic. [16][17][18][19][20][21][22] Moreover, NaNbO 3 attracts attention because its flexible structure enables the appearance of new phases and further applications.…”

mentioning

confidence: 99%

“…[5,6] Energy gap engineering is necessary to overcome such limitations. [7][8][9][10][11][12] There is growing interest in NaNbO 3 applications:…”

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confidence: 99%

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Visible–Near‐Infrared Diffuse Reflectance and Optical Energy Gap of Sodium Niobate Modified by Mn Ions: Na(Nb_1−zMn_z)O₃and (Na_1−xBi_x)(Nb_1−yMn_y)O₃Compounds Study

Molak

2022

Physica Status Solidi (b)

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The optical and electrical properties of sodium niobate crystals and ceramics doped with Mn atoms are studied. Na(Nb1−zMnz)O3 crystals exhibit actual z = 0–1.0 wt% Mn content. The Na(Nb1−zMnz)O3 ceramics contains Mn from the 0–5 wt% range. The (Na1−xBix)(Nb1−yMny)O3 ceramics is codoped with x = 0.015–0.50 and y = 0.01–0.33. Mn addition decreases the reflectance magnitude. Combined nonstoichiometry and local disorder in the crystal lattice, resulting from Mn doping and oxygen vacancies, induce contributions to the electronic structure. The visible and near‐infrared (Vis–NIR) diffuse reflectance, R(λ), spectra include a linear combination of contributions. The modified Kubelka–Munk function representation allows estimation of the optical energy gap, Egap. This estimation is qualitative because of the complex structure of the samples. Two optical gaps, showing dependence on Mn content, are discerned when Mn content <1 wt%. Egap,high changes toward the Shockley–Queisser limit, from 1.85 to 1.4 eV, when Mn content is low (z < 1 wt%). Simultaneous occurrence of Egap,low of 1.0–1.3 eV suggests tuning possibility. Egap of ≈1 eV dominates optical properties when Mn content is >1 wt%. The optical features are consistent with activation energy attributed to thermally generated electrical conductivity.

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Section: Discussionmentioning

confidence: 88%

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confidence: 99%

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Visible–Near‐Infrared Diffuse Reflectance and Optical Energy Gap of Sodium Niobate Modified by Mn Ions: Na(Nb_1−zMn_z)O₃and (Na_1−xBi_x)(Nb_1−yMn_y)O₃Compounds Study

Molak

2022

Physica Status Solidi (b)

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“…These candidate materials mainly include the following categories: NaNbO 3 as the main body, doped with La or Pr at the A-site, or doped with Mg, Mn, or Al at the B-site; CaSnO 3 is doped with Ga, La, or Pr at the A-site; GaBO 3 (B = Fe, Al, and Co) as the main body, the A-site is doped with Ba, Sr, Na, or La; and with BiBO 3 (B = Fe, Al, and Sc) as the main body, the A-site is doped with Na or Ga. Among them, pure and various modified NaNbO 3 have been studied in hydrogen generation, CO 2 conversion, and organic contaminant degradation. − The major drawback of NaNbO 3 is its poor light-harvesting capability caused by the wide E g (3.1–3.6 eV). The ion doping is considered an effective strategy for preparing visible-light-active NaNbO 3 because the E g of the semiconductor could be reduced. − The tin-based perovskite materials might become the attentive materials for photocatalysis benefitting from their strong oxidation and reduction ability .…”

Section: Regression On E G Ssa and Cs Of Abo3-type Perovskitesmentioning

confidence: 99%

Multiobjective Stepwise Design Strategy-Assisted Design of High-Performance Perovskite Oxide Photocatalysts

Tao

Chang

et al. 2021

J. Phys. Chem. C

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The rapid discovery of high-performance photocatalysts is one of the challenges in the field of photocatalysis research. Here, a multiobjective stepwise design strategy is developed to accelerate the design of potential ABO 3type perovskites with enhanced photocatalytic activity. The strategy includes model building, stepwise screening, and prediction of the hydrogen production rate (R H 2 ) of candidate perovskites. Based on the strategy, 35 candidate perovskites with a high specific surface area (SSA) (>60 m 2 g −1 ), a suitable bandgap (E g ) (1.4−2.6 eV), and a small crystallite size (CS) (<36 nm) are proposed. The predicted results of R H 2 of the candidates show they have high R H 2 (>6000 μmol h −1 g −1 ). The statistical analysis results reveal that a suitable E g is more likely to acquire when the main elements at the A site are Bi, La, and Pr, and those at the B site are Fe, Ti, and Mn. The perovskites prepared using the sol−gel, polymer complex, combustion method, and lower calcination temperature preferably have a higher SSA and a smaller CS. The relationship between target properties and R H 2 demonstrates that candidate perovskites with E g in the range of 1.9−2.4 eV, CS in the range of 20−32 nm, and a high SSA (>50 m 2 g −1 ) have a higher R H 2 . Furthermore, these models have been developed for online prediction applications.

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“…Perovskite-type compounds, such as halide perovskites, have been studied as promising photocatalysts for some applications such as CO 2 reduction under UV–visible radiation [ 9 ] and PET–RAFT polymerization under visible and near-infrared radiation [ 10 ], due to their superior properties. Other types, such as perovskite oxides, have shown to be more suitable than their halide counterparts for application as catalysts in the photocatalytic degradation of aqueous solutions of several compounds, including organic dyes, due to their higher water stability [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. These ceramic materials, with the general formula ABO 3 , are well known for their stable and flexible structure that allows the accommodation of several cationic combinations and consequent variety of properties.…”

Section: Introductionmentioning

confidence: 99%

Visible-Light-Driven AO7 Photocatalytic Degradation and Toxicity Removal at Bi-Doped SrTiO3

2022

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In this study, Bi-doped SrTiO3 perovskites (Sr1−xBixTiO3, x = 0, 0.03, 0.05, 0.07 and 0.1) were synthesized using the solid-state method, characterized, and tested as photocatalysts in the degradation of the azo dye acid orange 7 (AO7) under visible light. The perovskites were successfully synthesized, and XRD data showed a predominant, well-crystallized phase, belonging to the cubic perovskite symmetry. For the doped samples, a minority phase, identified as bismuth titanate, was detected. All doped samples exhibited improved photocatalytic activity under visible light, on the degradation of AO7 (10 mg L−1), when compared with the undoped SrTiO3, with an increase in relative Abs484 nm decay from 3.7% to ≥67.8% after 1 h, for a powder suspension of 0.2 g L−1. The best photocatalytic activity was exhibited by the Sr0.95Bi0.05TiO3 perovskite. Reusability studies showed no significant loss in photocatalytic activity under visible light. The final solutions showed no toxicity towards D. magna, proving the efficiency of Sr0.95Bi0.05TiO3 as a visible-light-driven photocatalyst to degrade both the AO7 dye as well as its toxic by-products. A degradation mechanism is proposed.

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Influence of cationic doping at different sites in NaNbO3 on the photocatalytic degradation of methylene blue dye

Cited by 22 publications

References 38 publications

Visible–Near‐Infrared Diffuse Reflectance and Optical Energy Gap of Sodium Niobate Modified by Mn Ions: Na(Nb_1−zMn_z)O₃and (Na_1−xBi_x)(Nb_1−yMn_y)O₃Compounds Study

Visible–Near‐Infrared Diffuse Reflectance and Optical Energy Gap of Sodium Niobate Modified by Mn Ions: Na(Nb_1−zMn_z)O₃and (Na_1−xBi_x)(Nb_1−yMn_y)O₃Compounds Study

Multiobjective Stepwise Design Strategy-Assisted Design of High-Performance Perovskite Oxide Photocatalysts

Visible-Light-Driven AO7 Photocatalytic Degradation and Toxicity Removal at Bi-Doped SrTiO3

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Influence of cationic doping at different sites in NaNbO3 on the photocatalytic degradation of methylene blue dye

Cited by 22 publications

References 38 publications

Visible–Near‐Infrared Diffuse Reflectance and Optical Energy Gap of Sodium Niobate Modified by Mn Ions: Na(Nb1−zMnz)O3and (Na1−xBix)(Nb1−yMny)O3Compounds Study

Visible–Near‐Infrared Diffuse Reflectance and Optical Energy Gap of Sodium Niobate Modified by Mn Ions: Na(Nb1−zMnz)O3and (Na1−xBix)(Nb1−yMny)O3Compounds Study

Multiobjective Stepwise Design Strategy-Assisted Design of High-Performance Perovskite Oxide Photocatalysts

Visible-Light-Driven AO7 Photocatalytic Degradation and Toxicity Removal at Bi-Doped SrTiO3

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Visible–Near‐Infrared Diffuse Reflectance and Optical Energy Gap of Sodium Niobate Modified by Mn Ions: Na(Nb_1−zMn_z)O₃and (Na_1−xBi_x)(Nb_1−yMn_y)O₃Compounds Study

Visible–Near‐Infrared Diffuse Reflectance and Optical Energy Gap of Sodium Niobate Modified by Mn Ions: Na(Nb_1−zMn_z)O₃and (Na_1−xBi_x)(Nb_1−yMn_y)O₃Compounds Study