Synergistic effect of polychromatic radiation on visible light activity of N-doped TiO2 photocatalyst

Kovalevskiy, Nikita; Selishchev, Dmitry; Svintsitskiy, Dmitry A.; Селищева, С. А.; Berezin, Alexey S.; Kozlov, Denis

doi:10.1016/j.catcom.2019.105841

Cited by 47 publications

(14 citation statements)

References 27 publications

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“…It is important to note that in addition to the main elements (Bi, W, Ti, and O) in the chemical composition of Bi 2 WO 6 –TiO 2 -N (5:100), XPS analysis of this sample shows a signal in the N1s spectral region at 399.8 eV attributed to nitrogen species ( Figure 4 c). We have previously shown [ 22 ] that this value of binding energy corresponds to nitrogen that is placed in an interstitial position in the TiO 2 lattice and has a weak positive charge due to interactions with lattice O atoms. The formed nitrogen species result in the appearance of additional energy levels (π* N-O) in the band gap of TiO 2 , above its VB [ 50 ], and provide the absorption of light in the visible region of the spectrum due to the excitation of electrons from these levels to the CB of TiO 2 .…”

Section: Resultsmentioning

confidence: 99%

“…N-doped TiO 2 (TiO 2 -N) was prepared from an aqueous solution of TiOSO 4 via the precipitation using ammonia according to our previously published technique [ 22 ]. Briefly, the solutions of titanium oxysulfate (1 M, 150 mL) and ammonium hydroxide (4 M) were simultaneously added dropwise to deionized water (200 mL) under vigorous stirring.…”

Section: Methodsmentioning

confidence: 99%

“…The potential of photogenerated holes localized in nitrogen levels is still high enough for the direct oxidation of organic molecules adsorbed on the surface of the photocatalyst [ 21 ]. As a result, N-doped TiO 2 is able to completely oxidize organic pollutants under radiation with wavelengths up to 500–530 nm and exhibits high values of quantum efficiency [ 22 ]. N-doped TiO 2 can be prepared using inexpensive inorganic precursors through simple routes that make it significant for practical application [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Photocatalytic Activity and Stability of Bi2WO6 – TiO2-N Nanocomposites in the Oxidation of Volatile Pollutants

et al. 2022

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The development of active and stable photocatalysts for the degradation of volatile organic compounds under visible light is important for efficient light utilization and environmental protection. Titanium dioxide doped with nitrogen is known to have a high activity but it exhibits a relatively low stability due to a gradual degradation of nitrogen species under highly powerful radiation. In this paper, we show that the combination of N-doped TiO2 with bismuth tungstate prevents its degradation during the photocatalytic process and results in a very stable composite photocatalyst. The synthesis of Bi2WO6–TiO2-N composites is preformed through the hydrothermal treatment of an aqueous medium containing nanocrystalline N-doped TiO2, as well as bismuth (III) nitrate and sodium tungstate followed by drying in air. The effect of the molar ratio between the components on their characteristics and photocatalytic activity is discussed. In addition to an enhanced stability, the composite photocatalysts with a low content of Bi2WO6 also exhibit an enhanced activity that is substantially higher than the activity of individual TiO2-N and Bi2WO6 materials. Thus, the Bi2WO6–TiO2-N composite has the potential as an active and stable photocatalyst for efficient purification of air.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced Photocatalytic Activity and Stability of Bi2WO6 – TiO2-N Nanocomposites in the Oxidation of Volatile Pollutants

et al. 2022

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“…The localized energy states result in the reduction of the bandgap, consequently leading to a redshift of the absorption edge [ 32 ]. A significant reduction in the bandgap to 2.06 eV of the CNB-TiO 2 from 2.63 eV for CB-TiO 2 is evident from Figure 3 c. This implies that electrons might be easily evacuated from both the impurity state of C and N into the CB of TiO 2 and from the VB of TiO 2 into the impurity state of C and N under visible light [ 33 , 34 ].…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Carbon and Carbon-Nitrogen Doped Black TiO2 Nanomaterials and Their Application in Sonophotocatalytic Remediation of Treated Agro-Industrial Wastewater

et al. 2021

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The conventional open ponding system employed for palm oil mill agro-effluent (POME) treatment fails to lower the levels of organic pollutants to the mandatory standard discharge limits. In this work, carbon doped black TiO2 (CB-TiO2) and carbon-nitrogen co-doped black TiO2 (CNB-TiO2) were synthesized via glycerol assisted sol-gel techniques and employed for the remediation of treated palm oil mill effluent (TPOME). Both the samples were anatase phase, with a crystallite size of 11.09–22.18 nm, lower bandgap of 2.06–2.63 eV, superior visible light absorption ability, and a high surface area of 239.99–347.26 m2/g. The performance of CNB-TiO2 was higher (51.48%) compared to only (45.72%) CB-TiO2. Thus, the CNB-TiO2 is employed in sonophotocatalytic reactions. Sonophotocatalytic process based on CNB-TiO2, assisted by hydrogen peroxide (H2O2), and operated at an ultrasonication (US) frequency of 30 kHz and 40 W power under visible light irradiation proved to be the most efficient for chemical oxygen demand (COD) removal. More than 90% of COD was removed within 60 min of sonophotocatalytic reaction, producing the effluent with the COD concentration well below the stipulated permissible limit of 50 mg/L. The electrical energy required per order of magnitude was estimated to be only 177.59 kWh/m3, indicating extreme viability of the proposed process for the remediation of TPOME.

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“…Non-metal element doping means that oxygen or partial oxygen in the TiO 2 was replaced by non-metals. The new energy band was reconstructed and the width of the forbidden band was shortened during doping the non-metal element [68][69][70]. As a result, the light response range was expanded.…”

Section: Non-metal Element Doping Modificationmentioning

confidence: 99%

Impact of Titanium Dioxide (TiO2) Modification on Its Application to Pollution Treatment—A Review

Zhou

2020

Catalysts

171

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A high-efficiency method to deal with pollutants must be found because environmental problems are becoming more serious. Photocatalytic oxidation technology as the environmentally-friendly treatment method can completely oxidate organic pollutants into pollution-free small-molecule inorganic substances without causing secondary pollution. As a widely used photocatalyst, titanium dioxide (TiO2) can greatly improve the degradation efficiency of pollutants, but several problems are noted in its practical application. TiO2 modified by different materials has received extensive attention in the field of photocatalysis because of its excellent physical and chemical properties compared with pure TiO2. In this review, we discuss the use of different materials for TiO2 modification, highlighting recent developments in the synthesis and application of TiO2 composites using different materials. Materials discussed in the article can be divided into nonmetallic and metallic. Mechanisms of how to improve catalytic performance of TiO2 after modification are discussed, and the future development of modified TiO2 is prospected.

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Synergistic effect of polychromatic radiation on visible light activity of N-doped TiO2 photocatalyst

Cited by 47 publications

References 27 publications

Enhanced Photocatalytic Activity and Stability of Bi2WO6 – TiO2-N Nanocomposites in the Oxidation of Volatile Pollutants

Enhanced Photocatalytic Activity and Stability of Bi2WO6 – TiO2-N Nanocomposites in the Oxidation of Volatile Pollutants

Synthesis and Characterization of Carbon and Carbon-Nitrogen Doped Black TiO2 Nanomaterials and Their Application in Sonophotocatalytic Remediation of Treated Agro-Industrial Wastewater

Impact of Titanium Dioxide (TiO2) Modification on Its Application to Pollution Treatment—A Review

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