Preparation of nanometer crystalline TiO2 with high photo-catalytic activity by pyrolysis of titanyl organic compounds and photo-catalytic mechanism

Chen, Xiaoquan; Liu, Huanbin; Guo-bang, GU

doi:10.1016/j.matchemphys.2004.11.030

Cited by 87 publications

(13 citation statements)

References 23 publications

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“…It can be seen from Figure b that two major EPR peaks at g values of 2.158 and 4.278 are observed which can be attributed to the formation of oxygen hole centers (OHC; SnO●, where “” denotes the three SnO bond and “●” is the unpaired electron) and Sn 3+ associated with oxygen vacancy species, respectively . These OHC defects can be formed by cleaving Sn–O–Sn linkages or by the rupture of a Sn‐OH group, while Sn 3+ associated with oxygen vacancy can be generated through incomplete oxidation during FSP synthesis . It has been reported that OHC sites, alongside the radicals, assists in the binding of CO 2 reactants, as well as active sites to stabilize the formate anion radical intermediate .…”

Section: Resultsmentioning

confidence: 99%

“…[39] It can be observed from Figure 4a, the intensity ratio between defects and the resonant A 1g phonon (I defect /I A1g ) was maximized for FSP-SnO 2 -5 (I defect /I A1g = 1.36) followed by FSP-SnO 2 -7 (I defect /I A1g = 1.25) and the lowest was for FSP-SnO 2 -3 (I defect /I A1g = 1.02). [44] It has been reported that OHC sites, alongside the radicals, assists in the binding of CO 2 reactants, [25,38,45] as well as active sites to stabilize the formate anion radical intermediate. UV-vis carried out with FSP-SnO 2 -5 further indicated that these defects are not changing the electronic states of the catalyst ( Figure S11, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

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Modulating Activity through Defect Engineering of Tin Oxides for Electrochemical CO₂ Reduction

et al. 2019

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The large‐scale application of electrochemical reduction of CO2, as a viable strategy to mitigate the effects of anthropogenic climate change, is hindered by the lack of active and cost‐effective electrocatalysts that can be generated in bulk. To this end, SnO2 nanoparticles that are prepared using the industrially adopted flame spray pyrolysis (FSP) technique as active catalysts are reported for the conversion of CO2 to formate (HCOO−), exhibiting a FEHCOO− of 85% with a current density of −23.7 mA cm−2 at an applied potential of −1.1 V versus reversible hydrogen electrode. Through tuning of the flame synthesis conditions, the amount of oxygen hole center (OHC; SnO●) is synthetically manipulated, which plays a vital role in CO2 activation and thereby governing the high activity displayed by the FSP‐SnO2 catalysts for formate production. The controlled generation of defects through a simple, scalable fabrication technique presents an ideal approach for rationally designing active CO2 reduction reactions catalysts.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Modulating Activity through Defect Engineering of Tin Oxides for Electrochemical CO₂ Reduction

et al. 2019

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“…The binding energy of O 1 s of TiO 2 lattice oxygen (Ti-O-Ti) for the VN3 sample is also shifted to 529.6 eV. Oxygen molecules can be dissociatively absorbed on the oxygen vacancies induced by doping N, thereby leading to a slight shift to lower binding energy of O 1 s of TiO 2 lattice oxygen (Ti-O-Ti) [ 18 ].…”

Section: Resultsmentioning

confidence: 99%

Self-organized vanadium and nitrogen co-doped titania nanotube arrays with enhanced photocatalytic reduction of CO2 into CH4

Zhang

Zhong

et al. 2014

Nanoscale Res Lett

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Self-organized V-N co-doped TiO2 nanotube arrays (TNAs) with various doping amount were synthesized by anodizing in association with hydrothermal treatment. Impacts of V-N co-doping on the morphologies, phase structures, and photoelectrochemical properties of the TNAs films were thoroughly investigated. The co-doped TiO2 photocatalysts show remarkably enhanced photocatalytic activity for the CO2 photoreduction to methane under ultraviolet illumination. The mechanism of the enhanced photocatalytic activity is discussed in detail.

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“…The reduction of Ti 4+ to Ti 3+ in this research took place during the calcination process at 500 • C. At this elevated temperature, the oxygen vacancies can transfer electrons to Ti 4+ to reduce it to Ti 3+ . In addition, the remaining carbon from the pyrolysis of TTIP can act as a reducing agent to facilitate the reduction of Ti 4+ on the surface to Ti 3+ [22,23]. The deconvolution of the O1s peak resulted in three bands (Figure 4c) that are centered at 529.3 eV, 531.4 eV and 533.3 eV.…”

Section: X-ray Photoelectron (Xps) Analysismentioning

confidence: 99%

Mesoporous TiO2 Implanted ZnO QDs for the Photodegradation of Tetracycline: Material Design, Structural Characterization and Photodegradation Mechanism

et al. 2021

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A sol-gel method was used to prepare a mesoporous TiO2 implanted with a ZnO quantum dot photocatalyst (TZQ) for the photodegradation of tetracycline (TC) under fluorescent light irradiation. Scanning electron microscopy (SEM) shows the presence of cavities on the photocatalyst surface due to the use of starch as a synthetic template, where the nitrogen sorption results indicate that TZQ contains mesopores with reduced size (ca. 4.3 nm) versus the pore size of the parent meso-TiO2 (ca. 7.5 nm). The addition of ZnO quantum dots (QDs) resulted in spherically-shaped binary composite particles in layers onto the surface of TiO2. The coexistence of the ZnO QDs and TiO2 phase was observed using high resolution-transmission electron microscopy (HR-TEM). The photodegradation of TC was carried out in a homemade reactor equipped with two fluorescent lights (24 W each) and within 90 min of irradiation, 94.6% of TC (40 mg L−1) was photodegraded using 250 mg L−1 of TZQ at pH 9. The major reactive oxygen species identified from the scavenging tests were O2●− followed by HO●. The deconvolution of the photoluminescence spectrum of TZQ indicates the presence of a strong quantum confinement effect (QCE) of the ZnO QDs, a defect related to Ti-species and oxygen. The analysis of the intermediates detected by LC-time-of-flight/mass spectrometry (LC/TOF-MS) suggest two photodegradation pathways. The pathways were validated using the Fukui function approach and the Wheland localisation approach. This simple and efficient photocatalytic technology is anticipated to benefit small-scale animal husbandries and aquaculture operators that have limited access to sustainable water treatment technology.

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Preparation of nanometer crystalline TiO2 with high photo-catalytic activity by pyrolysis of titanyl organic compounds and photo-catalytic mechanism

Cited by 87 publications

References 23 publications

Modulating Activity through Defect Engineering of Tin Oxides for Electrochemical CO₂ Reduction

Modulating Activity through Defect Engineering of Tin Oxides for Electrochemical CO₂ Reduction

Self-organized vanadium and nitrogen co-doped titania nanotube arrays with enhanced photocatalytic reduction of CO2 into CH4

Mesoporous TiO2 Implanted ZnO QDs for the Photodegradation of Tetracycline: Material Design, Structural Characterization and Photodegradation Mechanism

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Preparation of nanometer crystalline TiO2 with high photo-catalytic activity by pyrolysis of titanyl organic compounds and photo-catalytic mechanism

Cited by 87 publications

References 23 publications

Modulating Activity through Defect Engineering of Tin Oxides for Electrochemical CO2 Reduction

Modulating Activity through Defect Engineering of Tin Oxides for Electrochemical CO2 Reduction

Self-organized vanadium and nitrogen co-doped titania nanotube arrays with enhanced photocatalytic reduction of CO2 into CH4

Mesoporous TiO2 Implanted ZnO QDs for the Photodegradation of Tetracycline: Material Design, Structural Characterization and Photodegradation Mechanism

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Modulating Activity through Defect Engineering of Tin Oxides for Electrochemical CO₂ Reduction

Modulating Activity through Defect Engineering of Tin Oxides for Electrochemical CO₂ Reduction