TiOxNy Modified TiO2 Powders Prepared by Plasma Enhanced Atomic Layer Deposition for Highly Visible Light Photocatalysis

Cao, Yan‐Qiang; Zhao, Xi-Rui; Zhang, Wei; Zhu, Lin; Zhang, Xuejin; Wu, Di; Li, Aidong

doi:10.1038/s41598-018-30726-w

Cited by 28 publications

(30 citation statements)

References 44 publications

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“…. This result indicates that ultrathin ALD Fe 2 O 3 would not affect the crystal structure of TiO 2 , consistent with our previous finding 24,55 .…”

Section: Methodssupporting

confidence: 92%

“…All samples exhibit low adsorption capacity of MO molecules. As reported in our previous work, MO is selected here for its stability under visible light irradiation in the absence of catalysts 24 . Figure 6 a shows the evolution of UV–vis absorption spectra of MO solution in the presence of pristine TiO 2 under visible light irradiation.…”

Section: Resultsmentioning

confidence: 99%

“…High purity nitrogen gas (N 2 , 99.999%) was used as carrier gas at a total flow rate of 750 sccm and a pressure of 6 hPa in our ALD system (Picosun SUNALE™ R-150B). A particular container with porous mesh was used for ALD coating on powders, which has been reported elsewhere 24,55 , as shown in Fig. 1.…”

Section: Methodsmentioning

confidence: 99%

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Enhanced visible light photocatalytic activity of Fe2O3 modified TiO2 prepared by atomic layer deposition

Cao

Zhao

et al. 2020

Sci Rep

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In this work, commercial anatase TiO 2 powders were modified using ultrathin Fe 2 o 3 layer by atomic layer deposition (ALD). The ultrathin Fe 2 o 3 coating having small bandgap of 2.20 eV can increase the visible light absorption of tio 2 supports, at the meantime, Fe 2 o 3 /tio 2 heterojunction can effectively improve the lifetime of photogenerated electron-hole pairs. Results of ALD Fe 2 o 3 modified TiO 2 catalyst, therefore, showed great visible light driven catalytic degradation of methyl orange compared to pristine tio 2. A 400 cycles of ALD Fe 2 o 3 (~ 2.6 nm) coated TiO 2 powders exhibit the highest degradation efficiency of 97.4% in 90 min, much higher than pristine TiO 2 powders of only 12.5%. Moreover, an ultrathin ALD Al 2 o 3 (~ 2 nm) was able to improve the stability of Fe 2 o 3-tio 2 catalyst. These results demonstrate that ALD surface modification with ultrathin coating is an extremely powerful route for the applications in constructing efficient and stable photocatalysts. A rapid industrial development driven by unsustainable technology advances can cause plenty of industrial sewage, spreading chemical hazards into water resources. As a result, water pollution has emerged as one of the most serious environmental issues worldwide 1-4. Photocatalytic oxidation technology has shown great prospects in removing the toxic and harmful contaminants in aqueous environment 5-7. Semiconductors (e.g. TiO 2 , ZnO, SnO 2) have been widely researched for organic pollutant degradation, however, the large band gap hinders their practical applications 8-12. For example, TiO 2 with band gap of 3.2 eV can only absorb the ultraviolet light, accounting for only 4-5% of entire solar spectrum 13. Therefore, various visible light sensitive photocatalysts has also been widely explored, such as g-C 3 N 4 , BiVO 4 , CdSe, Bi 2 WO 6 14-19. On the other hand, TiO 2 is recognized as one of the excellent materials owning to its good inertness, eco-friendly, low cost, strong oxidizing power, and long-term stability against photo and chemical corrosion 9,13,20-22. Thus, plenty of works have been made to extend the absorption spectrum of TiO 2 to visible light so to make a full use of solar spectrum. Several different approaches can be employed, including doping 23-26 and coupling with small band gap semiconductors or metals 27-30. Small band gap semiconductors not only increase the absorption of visible light but also inhibit photogenerated electrons-holes recombination when constructed as a semiconductor/semiconductor heterojunction structure, thus improving the photocatalytic performance dramatically 31. Therefore, various TiO 2 based heterojunction photocatalysts have been proposed for visible light photocatalysis, including NiO/TiO 2 32,33

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“…. This result indicates that ultrathin ALD Fe 2 O 3 would not affect the crystal structure of TiO 2 , consistent with our previous finding 24,55 .…”

Section: Methodssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced visible light photocatalytic activity of Fe2O3 modified TiO2 prepared by atomic layer deposition

Cao

Zhao

et al. 2020

Sci Rep

Self Cite

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“…It is well known that as a photocatalyst TiO 2 can be activated when absorbing photon energy (hv) that is greater than or equal to the bandgap energy (3.0 eV for rutile phase and 3.2 eV for anatase phase) between the valence band (VB) and the conductive band (CB) to form the electron-hole pairs (e − -h + ) [14,50]. Although it is a fact that non-thermal CO 2 plasma can generate UV radiation [14,18], its photon flux is too low to make any significant contribution to the activation of TiO 2 catalysts, as widely reported and demonstrated in various works [14,41,48].…”

Section: Discussionmentioning

confidence: 99%

Plasma-enhanced catalytic activation of CO2 in a modified gliding arc reactor

Zhang

et al. 2020

Waste Dispos. Sustain. Energy

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For the first time, this paper demonstrates a synergistic effect from the combination of a gliding arc discharge plasma with a photocatalyst TiO 2 for CO 2 dissociation. The effects of adding a tray downstream the discharge and the combination of the catalyst with plasma have been investigated. Two different combination modes of plasma catalysis, i.e., in-plasma catalysis and post-plasma catalysis, have been evaluated with the emphasis on the analysis of potential mechanisms. The results show that modifying the gliding arc reactor by the addition of a tray can enhance the fraction of gas treated by plasma, thus improving the reaction performance. An exceptional synergistic effect of combining the gliding arc discharge with TiO 2 for CO 2 activation forms in the in-plasma catalysis mode. The presence of TiO 2 significantly enhances the CO 2 conversion by 138% and the energy efficiency by 133% at a flow rate of 2 L/min. The plasma activation effect, which produces energetic electrons that can create the electron-hole pairs on the catalyst surface, is believed to be the major contributor to the generation of the plasma catalysis synergy. This mechanism has been further evidenced by the negligible influence of the post-plasma catalysis on the reaction performance.

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“…To achieve this goal, attempts have been made to understand and modify the physical and chemical properties of TiO 2 , such as the slow-light effect in periodic TiO 2 photonic crystals [65] and the multi-reflection effect in semi-hollow TiO 2 spheres [66]. Attempts have also been made to improve TiO 2 by classic chemical element doping [67][68][69][70][71], dye sensitizing [72,73], formation of semiconducting junctions [74][75][76][77], localized surface plasmon resonance (LSPR) photosensitization [78,79], stoichiometric adjustment or coordination of surface atoms or surface oxygen vacancies [61,[80][81][82][83] and tuning inter-particle interactions of TiO 2 nanocrystals [84,85]. In particular, Ti 3+ -self-doped TiO 2 (Ti 3+ -TiO 2 ) such as blue-black TiO 2 has been found to induce high efficiency in visible-light-driven photocatalysis [86][87][88][89][90][91][92][93][94].…”

Section: Introductionmentioning

confidence: 99%

Recent Developments of Advanced Ti3+-Self-Doped TiO2 for Efficient Visible-Light-Driven Photocatalysis

Seo

Lee

2020

Catalysts

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Research into the development of efficient semiconductor photocatalytic materials is a promising approach to solving environmental and energy problems worldwide. Among these materials, TiO2 photocatalysts are one of the most commonly used due to their efficient photoactivity, high stability, low cost and environmental friendliness. However, since the UV content of sunlight is less than 5%, the development of visible light-activated TiO2-based photocatalysts is essential to increase the solar energy efficiency. Here, we review recent works on advanced visible light-activated Ti3+-self-doped TiO2 (Ti3+–TiO2) photocatalysts with improved electronic band structures for efficient charge separation. We analyze the different methods used to produce Ti3+–TiO2 photocatalysts, where Ti3+ with a high oxygen defect density can be used for energy production from visible light. We categorize advanced modifications in electronic states of Ti3+–TiO2 by improving their photocatalytic activity. Ti3+–TiO2 photocatalysts with large charge separation and low recombination of photogenerated electrons and holes can be practically applied for energy conversion and advanced oxidation processes in natural environments and deserve significant attention.

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TiOxNy Modified TiO2 Powders Prepared by Plasma Enhanced Atomic Layer Deposition for Highly Visible Light Photocatalysis

Cited by 28 publications

References 44 publications

Enhanced visible light photocatalytic activity of Fe2O3 modified TiO2 prepared by atomic layer deposition

Enhanced visible light photocatalytic activity of Fe2O3 modified TiO2 prepared by atomic layer deposition

Plasma-enhanced catalytic activation of CO2 in a modified gliding arc reactor

Recent Developments of Advanced Ti3+-Self-Doped TiO2 for Efficient Visible-Light-Driven Photocatalysis

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