Synergism of oxygen vacancies, Ti3+ and N dopants on the visible-light photocatalytic activity of N-doped TiO2

Zhao, Bo; Wang, Xin; Zhang, Yizeng; Gao, Junning; Chen, Zhiwu; Lu, Zhenya

doi:10.1016/j.jphotochem.2019.111928

Cited by 42 publications

(10 citation statements)

References 31 publications

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“…3(b), two peaks located at 458.1 and 463.9 eV in Ti 2p XPS spectrum belong to Ti 2p 3/2 and Ti 2p 1/2 , respectively. The two peaks have slightly lower binding values than those of classical spectrum of Ti 4+ in TiO 2 [43], suggesting NO 3 doping has negligible effect on the chemical valence status of Ti. Fig.…”

Section: Catalysts Characterizationmentioning

confidence: 82%

Photocatalytic degradation of flumequine by N-doped TiO2 catalysts under simulated sunlight

Zeng

Sun

Wang

2020

Environmental Engineering Research

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Flumequine (FLU) is one of the most used fluoroquinolone antibiotics in intensive aquaculture, however, it has become a typical pollutant in water environment at present due to inappropriate use. Therefore, it is necessary to develop facile techniques for efficient degradation of FLU. In this work, three N-doped TiO2 photocatalysts were synthesized for degradation of FLU. The obtained photocatalysts were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectrum and UV-Vis diffuse reflection spectra (UV-Vis-DRS). The XRD and XPS results from NH4NO3-doped catalyst (TiO2/AN) confirmed that NO3- ions were successfully incorporated into the lattice of TiO2. The TiO2/AN sample exhibited higher photocatalytic performance than other N-doped catalysts under simulated sunlight irradiation, and 100% removal efficiency of FLU was achieved after 4 hours of illumination. The photogenerated holes (h+) and hydroxyl radicals (•OH) are main reactive species involved in the photocatalytic degradation of FLU. Eight intermediates for photocatalytic degradation of FLU were detected and their toxicities to aquatic organisms were predicted. This study might have important implications for further research on the removal of fluoroquinolone antibiotics in wastewater.

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Section: Catalysts Characterizationmentioning

confidence: 82%

Photocatalytic degradation of flumequine by N-doped TiO2 catalysts under simulated sunlight

Zeng

Sun

Wang

2020

Environmental Engineering Research

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“…Figure 3 c presents the high-resolution XPS spectra of O 1s in the TW and TWCu7 samples. The peaks at 530.15, 532.20, and 533.20 eV were assigned to Ti–O, the hydroxyl groups on the wood’s surface, and the adsorption of oxygen in water molecules or carbon–oxygen bonds, respectively [ 37 , 38 , 39 ]. The binding energy of the Ti–O bond in the TWCu7 sample was 0.1 eV higher than that in the TW sample.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Cu-Doped TiO2 on Wood Substrate with Highly Efficient Photocatalytic Performance and Outstanding Recyclability for Formaldehyde Degradation

Jia

et al. 2023

Molecules

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Photocatalytic oxidation is considered one of the most effective ways to remove formaldehyde from indoor air. However, the use of powder photocatalysts is limited by their low adsorption capacity and strong aggregation tendency. Hence, there is a need for a composite material with good cycling stability and high degradation efficiency. In the present study, a unique wood-based composite is produced by arranging Cu–TiO2 nanoparticles on porous structured wood. The porous structure of wood can adsorb formaldehyde, and the abundant functional groups on the surface can act as a reaction platform for anchoring the Cu–TiO2 nanoparticles. Cu doping facilitates electron interaction between TiO2 and Cu, promotes the transfer of charge carriers, lowers the electron–hole recombination rate, and improves the photocatalytic degradation efficiency of formaldehyde. The photocatalytic efficiency of the wood-based composites was highest (85.59%) when the n(Cu)/n(Ti) ratio was 7%. After nine cycles, the wood composites still had a high degradation rate, indicating good recyclability. Overall, this wood composite is an eco-friendly and promising material for indoor air filtration.

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“…As a result, the decomposed H 2 can result in the formation of reduced TiO 2 when annealing TiO 2 powder in an NH 3 flow. For instance, Zhao et al [103] prepared N-doped TiO 2 photocatalysts through a simple solvothermal strategy, followed by a solid-state chemical reduction process. Based on the analysis of the results of the control experiments, they proposed that the reason for the narrowed N-TiO 2-x bandgap is the synergetic effect of the defect energy states (including Ti 3+ and OVs) and N 2p midgap state.…”

Section: Mechanisms For Visible Light Responsementioning

confidence: 99%

Visible Light-Responsive N-Doped TiO2 Photocatalysis: Synthesis, Characterizations, and Applications

Lian

Zhang

2021

Trans. Tianjin Univ.

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Photocatalysis based on semiconductors has recently been receiving considerable research interest because of its extensive applications in environmental remediation and renewable energy generation. Various semiconductor-based materials that are vital to solar energy utilization have been extensively investigated, among which titanium oxide (TiO2) has attracted considerable attention because of its exceptional physicochemical characteristics. However, the sluggish responsiveness to visible light in the solar spectrum and the inefficient separation of photoinduced electron–hole pairs hamper the practical application of TiO2 materials. To overcome the aforementioned serious drawbacks of TiO2, numerous strategies, such as doping with foreign atoms, particularly nitrogen (N), have been improved in the past few decades. This review aims to provide a comprehensive update and description of the recent developments of N-doped TiO2 materials for visible light-responsive photocatalysis, such as (1) the preparation of N-doped/co-doped TiO2 photocatalysts and (2) mechanistic studies on the reasons for visible light response. Furthermore, the most recent and significant advances in the field of solar energy applications of modified N-doped TiO2 are summarized. The analysis indicated the critical need for further development of these types of materials for the solar-to-energy conversion, particularly for water splitting purposes.

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Synergism of oxygen vacancies, Ti3+ and N dopants on the visible-light photocatalytic activity of N-doped TiO2

Cited by 42 publications

References 31 publications

Photocatalytic degradation of flumequine by N-doped TiO2 catalysts under simulated sunlight

Photocatalytic degradation of flumequine by N-doped TiO2 catalysts under simulated sunlight

Synthesis of Cu-Doped TiO2 on Wood Substrate with Highly Efficient Photocatalytic Performance and Outstanding Recyclability for Formaldehyde Degradation

Visible Light-Responsive N-Doped TiO2 Photocatalysis: Synthesis, Characterizations, and Applications

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