Size effect of Au nanoparticles in Au-TiO2-x photocatalyst

Lin, Lina; Zhong, Qilan; Zheng, Yi; Cheng, Yan; Qi, Ruijuan

doi:10.1016/j.cplett.2021.138457

Cited by 29 publications

(16 citation statements)

References 30 publications

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“…KPFM technology also demonstrates the surface potential difference (Δ V ) of the photocatalysts before and after UV irradiation, as shown in Figure b–g. − In the dark, the surface potential of TiO 2 was 20 mV higher than that of the substrate due to the different Φ values. After UV irradiation, Δ V increased to 110 mV, implying the accumulation of holes at the surface.…”

Section: Results and Discussionmentioning

confidence: 99%

Au Single Atom Supported on TiO₂ Drives Hole Mitigation for the Enhanced Photooxidation of Hg⁰

et al. 2023

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Noble metal-supported TiO 2 has excellent photocatalytic activity for the oxidation of Hg 0 due to the Mott−Schottky barrier that prevents the recombination of photogenerated hole−electron pairs. However, surface noble-metal atoms usually cause low atomic utilization, of which the inner layer cannot participate in the oxidation and is hence not beneficial for improving the photocatalytic activity. Single-atom-based catalysts (SAC) have an extreme atomic efficiency, reducing the amount of noble metals and significantly improving photocatalytic activity. Herein, 0.1% Au single atom (SA)-doped Ti 4+ defect TiO 2 (0.1% Au−Ti 1-x O 2 ) with Au−(O) 4 coordination was used for the photooxidation of Hg 0 . Second, the influence of the coordination on the separation of photogenerated electron−hole pairs, the transfer direction of charges, and the oxidation of Hg 0 was thoroughly explored using transient photovoltage (TPV), in situ X-ray photoelectron spectroscopy (XPS), density functional theory (DFT), etc. Finally, the influence of SO 2 and NO on the photooxidation of Hg 0 was discussed using in situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS). 0.1% Au−Ti 1-x O 2 had a much higher photooxidation efficiency of Hg 0 than 0.1% Au/TiO 2 . Moreover, the Au−(O) 4 coordination significantly promoted the separation of photogenerated electron−hole pairs by driving the mitigation of photogenerated holes. Additionally, 0.1% Au−Ti 1-x O 2 exhibited a remarkable resistance to SO 2 and NO because Au SA effectively avoided the deposition of nitrates and sulfates. This study provides a valuable surface engineering strategy for the atomic-level dispersion of noble metal-modified TiO 2 .

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Section: Results and Discussionmentioning

confidence: 99%

Au Single Atom Supported on TiO₂ Drives Hole Mitigation for the Enhanced Photooxidation of Hg⁰

et al. 2023

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“…In this way, a red-violet solid material ( Figure 1 ) containing about 5% Au was obtained (see experimental section for details). It is well known that the size of the constituent nanoparticles has a tremendous impact on the activity of the material [ 27 ]; undoubtedly, the preparation method also plays a crucial role [ 28 ].…”

Section: Resultsmentioning

confidence: 99%

Chemical Degradation of Methylene Blue Dye Using TiO2/Au Nanoparticles

et al. 2021

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Gold nanoparticles (~10 nm) were deposited on titanium dioxide nanoparticles (~21 nm) and the material obtained was characterized using IR, UV-Vis, N2 adsorption–desorption isotherm, DLS, EDS (EDX), TEM, XPS, and XRD techniques. It was found that the methylene blue dye is degraded in the presence of this material when using hydrogen peroxide as the oxidant. Tests were performed at 2, 4, 6, and 24 h, with hydrogen peroxide contents varying from 1 to 5 mg/mL. Longer exposure time and a higher content of oxidant led to the degradation of methylene blue dye at up to 90%. The material can be reused several times with no loss of activity.

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“…Given this, many scholars introduced noble metal ions into semiconductor materials to improve their photocatalytic activity, which has been applied in traditional semiconductor materials such as TiO 2 . [ 66–70 ] Therefore, many scholars have modified the new photocatalyst zinc tungstate to load noble metal ions.…”

Section: Application Of Znwo4mentioning

confidence: 99%

Synthesis Methods and Applications of Semiconductor Material ZnWO₄ with Multifunctions and Multiconstructions

Wang

et al. 2021

Energy Tech

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At present, nanostructures with excellent morphology have become a research hotspot. With the deepening of research and the rapid development of nanotechnology, nanosemiconductors have also made remarkable progress. In recent years, ZnWO4 in metal tungstates has been widely used in many fields, which is mainly due to its high crystal density, short radiation length, excellent optical properties, good radiation damage resistance, and non‐liquefaction. Therefore, herein, the synthesis methods and applications of ZnWO4 semiconductor materials in recent years are reviewed. First, the crystal structure and characteristics of ZnWO4 are described, and then the latest research progress of ZnWO4 semiconductor materials is summarized. The synthesis methods and contributions to photocatalysis, sensors, electronic materials, and luminescent materials are highlighted. The characteristics of ZnWO4 nanoarrays and their applications in supercapacitors are particularly emphasized, which provide a reference for the development of multifunctional nanoarrays. Finally, the challenges and countermeasures of ZnWO4 semiconductor materials are summarized and prospected. In a word, a new idea and strategy to design and assemble new types of ZnWO4 nanomaterials with multiconstructional systems and multifunctional properties for their practical applications is provided.

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Size effect of Au nanoparticles in Au-TiO2-x photocatalyst

Cited by 29 publications

References 30 publications

Au Single Atom Supported on TiO₂ Drives Hole Mitigation for the Enhanced Photooxidation of Hg⁰

Au Single Atom Supported on TiO₂ Drives Hole Mitigation for the Enhanced Photooxidation of Hg⁰

Chemical Degradation of Methylene Blue Dye Using TiO2/Au Nanoparticles

Synthesis Methods and Applications of Semiconductor Material ZnWO₄ with Multifunctions and Multiconstructions

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Size effect of Au nanoparticles in Au-TiO2-x photocatalyst

Cited by 29 publications

References 30 publications

Au Single Atom Supported on TiO2 Drives Hole Mitigation for the Enhanced Photooxidation of Hg0

Au Single Atom Supported on TiO2 Drives Hole Mitigation for the Enhanced Photooxidation of Hg0

Chemical Degradation of Methylene Blue Dye Using TiO2/Au Nanoparticles

Synthesis Methods and Applications of Semiconductor Material ZnWO4 with Multifunctions and Multiconstructions

Contact Info

Product

Resources

About

Au Single Atom Supported on TiO₂ Drives Hole Mitigation for the Enhanced Photooxidation of Hg⁰

Au Single Atom Supported on TiO₂ Drives Hole Mitigation for the Enhanced Photooxidation of Hg⁰

Synthesis Methods and Applications of Semiconductor Material ZnWO₄ with Multifunctions and Multiconstructions