Enhancement of photocatalytic activities of nitrogen-doped titanium dioxide by ambient plasma

Ibukun, Olaniyan; Jeong, Hae Kyung

doi:10.1016/j.cplett.2020.137234

Cited by 12 publications

(6 citation statements)

References 41 publications

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“…As seen in Figure c, the NM-WO 3– x @MC demonstrates the weakest intensity of PL, revealing more efficient inhabitation of the recombination of the electron–hole pair. This indicates that the recombination phenomena were noticeably retarded, and the separation of photogenerated charge carriers is accomplished by the presence of MC and nitrogen doping. , …”

Section: Resultsmentioning

confidence: 89%

“…This indicates that the recombination phenomena were noticeably retarded, and the separation of photogenerated charge carriers is accomplished by the presence of MC and nitrogen doping. 40,53 The EIS test was performed to study the electron-transport capacity of the generated materials (Figure 5d). Variations in the electrochemical impedance are significant indicators to evaluate the changes in the interfacial properties.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of N-Doped Magnetic WO_3–x@Mesoporous Carbon Using a Diatom Template and Plasma Modification: Visible-Light-Driven Photocatalytic Activities

Gholami

Khataee

Bhatnagar

et al. 2021

ACS Appl. Mater. Interfaces

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Synthesis of three-dimensional photocatalysts offers great potential for chemical conversion and hydrogen generation as appropriate solutions for environmental protection and energy shortage challenges. In this study, the magnetic WO 3−x @ mesoporous carbon (M-WO 3−x @MC) was synthesized through the evaporation-induced self-assembly method applying diatom frustules as a natural template. Then, plasma modification was used to prepare the N-doped M-WO 3−x @MC (NM-WO 3−x @MC) with enhanced photocatalytic activity and durable performance. The WO 3−x was embedded in the conductive MC, which was also partially reduced by the carbon precursor within the heat-treatment procedure. The obtained M-WO 3−x @MC was treated by the plasma under an N 2 atmosphere for the production of the final photocatalyst containing both the N-doped WO 3−x and MC. As a result, the NM-WO 3−x @MC had larger surface area (208.4 m 2 g −1 ), narrower band gap (2.3 eV), more visible light harvesting, and confined electron−hole pairs recombination. The H 2 generation rates of net WO 3 nanorods and NM-WO 3−x @MC nanocomposite were estimated as 532 and 2765 μmol g −1 h −1 , respectively. Additionally, more than 90% of antibiotics (cephalexin, cefazolin and cephradine) degradation and 76% of total organic carbon elimination were obtained after 120 and 240 min of photocatalytic process under visible light irradiation. Eventually, more than eight intermediates were detected for each antibiotic degradation using the gas chromatography−mass spectrometer method, and based on the obtained results, the possible degradation pathways were suggested.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Synthesis of N-Doped Magnetic WO_3–x@Mesoporous Carbon Using a Diatom Template and Plasma Modification: Visible-Light-Driven Photocatalytic Activities

Gholami

Khataee

Bhatnagar

et al. 2021

ACS Appl. Mater. Interfaces

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“…The deconvolution peaks of C 1s (Supplementary Figure S2b) could be attributed to the structure of the C-O/C-N (285.6 eV) [52,53], C-C/C=C (284.3 eV) [54] and C=O (287.4 eV) bonds [53], respectively. The high-resolution XPS spectrum of O 1s (Supplementary Figure S2c) exhibited three peaks at 530.3 eV, 513.6 eV and 534.8 eV, which were associated with the -OH [55], C=O [3] and C-OH bonds [56], indicating that plenty of hydrophilic groups, such as carboxyl and hydroxyl groups, were integrated into the FW-CDs. In addition, the three deconvolved peaks of N 1s (Supplementary Figure S2d) at 398.38 eV, 400.28 eV and 401.08 eV disclosed that the nitrogen atoms severally existed in the form of pyrrolic-like N, pyridinic-like N and graphitic-like N [57].…”

Section: Characterization Of Fw-cdsmentioning

confidence: 99%

Sustainable and Green Synthesis of Waste-Biomass-Derived Carbon Dots for Parallel and Semi-Quantitative Visual Detection of Cr(VI) and Fe3+

Xia

Zhang

et al. 2022

Molecules

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Carbon dot (CD)-based multi-mode sensing has drawn much attention owing to its wider application range and higher availability compared with single-mode sensing. Herein, a simple and green methodology to construct a CD-based dual-mode fluorescent sensor from the waste biomass of flowers of wintersweet (FW-CDs) for parallel and semi-quantitative visual detection of Cr(VI) and Fe3+ was firstly reported. The FW-CD fluorescent probe had a high sensitivity to Cr(VI) and Fe3+ with wide ranges of linearity from 0.1 to 60 µM and 0.05 to 100 µM along with low detection limits (LOD) of 0.07 µM and 0.15 µM, respectively. Accordingly, the FW-CD-based dual-mode sensor had an excellent parallel sensing capacity toward Cr(VI) and Fe3+ with high selectivity and strong anti-interference capability by co-using dual-functional integration and dual-masking strategies. The developed parallel sensing platform was successfully applied to Cr(VI) and Fe3+ quantitative detection in real samples with high precision and good recovery. More importantly, a novel FW-CD-based fluorescent hydrogel sensor was fabricated and first applied in the parallel and semi-quantitative visual detection of Cr(VI) and ferrous ions in industrial effluent and iron supplements, further demonstrating the significant advantage of parallel and visual sensing strategies.

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“…Several strategies have been devised to enhance the photocatalytic performance of titanium oxide materials. These methods include nonmetal or metal doping, synthesis of "black" titanium dioxide, expansion of surface area through chemical treatments and sol-gel synthesis, deposition on high-surface-area substrates like graphene, and the use of hydrothermal methods [10][11][12][13][14][15][16]. These modifications commonly alter the band structure of titanium oxide, extending its absorption range and/or improving charge separation, thus reducing electron-hole pair recombination time.…”

Section: Introductionmentioning

confidence: 99%

Improved photocatalytic performance via air‐plasma modification of titanium dioxide: Insights from experiments and simulations

Ugwumadu,

Ibukun,

Jeong

et al. 2024

Materialwissenschaft Werkst

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Commercial titanium dioxide is successfully plasma‐treated under ambient conditions for different periods, leading to reduced crystallite size and the creation of oxygen vacancies. Density functional theory‐based calculations reveal the emergence of additional localized states close to the conduction band, primarily associated with under‐coordinated titanium atoms in non‐stoichiometric titanium‐oxide systems. The plasma‐treated samples exhibit improved photocatalytic performance in the degradation of methylene blue compared to untreated samples. Moreover, the 4‐hour plasma‐treated photocatalyst demonstrates commendable stability and reusability. This work highlights the potential of cost‐effective plasma treatment as a simple modification technique to significantly enhance the photocatalytic capabilities of titanium‐oxide materials.

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Enhancement of photocatalytic activities of nitrogen-doped titanium dioxide by ambient plasma

Cited by 12 publications

References 41 publications

Synthesis of N-Doped Magnetic WO_3–x@Mesoporous Carbon Using a Diatom Template and Plasma Modification: Visible-Light-Driven Photocatalytic Activities

Synthesis of N-Doped Magnetic WO_3–x@Mesoporous Carbon Using a Diatom Template and Plasma Modification: Visible-Light-Driven Photocatalytic Activities

Sustainable and Green Synthesis of Waste-Biomass-Derived Carbon Dots for Parallel and Semi-Quantitative Visual Detection of Cr(VI) and Fe3+

Improved photocatalytic performance via air‐plasma modification of titanium dioxide: Insights from experiments and simulations

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Enhancement of photocatalytic activities of nitrogen-doped titanium dioxide by ambient plasma

Cited by 12 publications

References 41 publications

Synthesis of N-Doped Magnetic WO3–x@Mesoporous Carbon Using a Diatom Template and Plasma Modification: Visible-Light-Driven Photocatalytic Activities

Synthesis of N-Doped Magnetic WO3–x@Mesoporous Carbon Using a Diatom Template and Plasma Modification: Visible-Light-Driven Photocatalytic Activities

Sustainable and Green Synthesis of Waste-Biomass-Derived Carbon Dots for Parallel and Semi-Quantitative Visual Detection of Cr(VI) and Fe3+

Improved photocatalytic performance via air‐plasma modification of titanium dioxide: Insights from experiments and simulations

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Synthesis of N-Doped Magnetic WO_3–x@Mesoporous Carbon Using a Diatom Template and Plasma Modification: Visible-Light-Driven Photocatalytic Activities

Synthesis of N-Doped Magnetic WO_3–x@Mesoporous Carbon Using a Diatom Template and Plasma Modification: Visible-Light-Driven Photocatalytic Activities