Narrowing band gap energy of defective black TiO2 fabricated by solution plasma process and its photocatalytic activity on glycerol transformation

Jedsukontorn, Trin; Ueno, Tomonaga; Saito, Nagahiro; Hunsom, Mali

doi:10.1016/j.jallcom.2018.05.046

Cited by 46 publications

(25 citation statements)

References 59 publications

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“…The TAR-2 sample in Figure 4(d) also exhibits clear lattice fringes in most part of the window. However, the sample does have amorphous domains with unclear lattice fringes as highlighted with the white circles 18,19 . The amorphous areas are regard as the defected parts in the crystal bulk 18 .…”

Section: Catalyst Characterizationmentioning

confidence: 99%

A two-anode reduction technique to monitor the defect and dope the surface of TiO2 nanotube array as photo-anode for water splitting

Hou

Jiang

2019

Applied Catalysis B: Environmental

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A two-anode reduction (TAR) technique is adopted to prepare, in one step without the existence of gaseous hydrogen, black TiO2 nanotubes co-doped with carbon and nitrogen. A sample prepared with the TAR technique for 2 min achieved the highest photocurrent response as 2.05 mA/cm 2 , which is 3 times as high as that of the pristine TiO2 nanotubes. A synergistic effect between black hydrogenation and C, N co-doping is observed. The light absorption in the whole ultraviolet-visible (UV-Vis) range is also greatly enhanced.

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Section: Catalyst Characterizationmentioning

confidence: 99%

A two-anode reduction technique to monitor the defect and dope the surface of TiO2 nanotube array as photo-anode for water splitting

Hou

Jiang

2019

Applied Catalysis B: Environmental

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“…Solar power is an alternative clean energy source with many advantages over fossil fuels, including low cost, abundance, and renewability. Semiconductor photocatalysts are environment‐friendly materials used in many application fields, including photocatalysis . For instance, water pollution caused by organic dyes and their effluents is extremely harmful and difficult to clean through conventional sewage disposal.…”

Section: Introductionmentioning

confidence: 99%

“…Semiconductor photocatalysts are environment-friendly materials used in many application fields, including photocatalysis. [3][4][5][6] For instance, water pollution caused by organic dyes and their effluents is extremely harmful and difficult to clean through conventional sewage disposal. Semiconductor photocatalysts have shown high efficiencies and stabilities in industrial wastewater management by converting organic pollutants into comparatively harmless end products.…”

Section: Introductionmentioning

confidence: 99%

Heterostructured Ag/g‐C₃N₄/TiO₂ with enhanced visible light photocatalytic performances

Zhou

Hong

Zhang

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: Titanium dioxide (TiO 2 ) is considered as one of the most potential photocatalysts among various oxide semiconductor photocatalysts. In order to improve the photocatalytic performance of TiO 2 -based photocatalysts, it is pivotal to explore an efficient method to promote the separation of photoexcited charges, accelerate the carrier transmission efficiency and enhance visible-light absorption.RESULTS: In this study, heterostructured Ag/g-C 3 N 4 /TiO 2 ternary photocatalysts were successfully constructed using a facile accessible route. The structures, morphologies, chemical compositions and optical properties of the obtained composites were characterized by various analytical methods. The performance of the ternary photocatalysts was then tested for degradation of Rhodamine B (RhB) under visible light irradiation. The specimen prepared by loading 2% silver (Ag) nanoparticles onto the composites showed the best photocatalytic activity towards RhB degradation (99.7%) with satisfactory stability. The degradation rate using ternary photocatalyst reached 0.0179 min −1 , almost 20-and 2.3-folds higher than those of pure TiO 2 and binary sample. To gain better insights, a possible photocatalytic enhancement mechanism was also proposed. CONCLUSION: The improved photocatalytic properties were attributed to the heterostructure between TiO 2 and graphite carbon nitride (g-C 3 N 4 ) as well as the loading Ag nanoparticles. The formation of the heterostructure between TiO 2 and g-C 3 N 4 , combined with the load of Ag nanoparticles created a synergistic effect, leading to the enhanced photocatalytic performance. Overall, these findings look promising for future photodegradation of organic pollutants. Photocatalytic activity testingThe photocatalytic activities of the as-prepared samples were evaluated through degradation of RhB (10 mg L −1 ) in aqueous solution under simulated visible light. A 300 W xenon arc lamp with UV cut-off filter ( > 400 nm) was used as visible light irradiation source. Briefly, 20 mg photocatalyst was dispersed in

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“…The highly energetic discharge particles can modify the surface in a short time, especially compared to time-consuming thermal treatments, via charge transfer, sputtering, or deposition [21]. Reported research concerning the plasma treatment of TiO 2 -based materials primarily utilises high temperature or high power plasma [13,22,23,24]. In comparison, there is a distinct lack of knowledge regarding the effect of low-temperature plasma treatments on defect generation and the ensuing influence this has on the catalytic performance of mixed metal oxide systems, such as SiO 2 /TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Plasma Treating Mixed Metal Oxides to Improve Oxidative Performance via Defect Generation

et al. 2019

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The generation of structural defects in metal oxide catalysts offers a potential pathway to improve performance. Herein, we investigated the effect of thermal hydrogenation and low-temperature plasma treatments on mixed SiO2/TiO2 materials. Hydrogenation at 500 °C resulted in the reduction of the material to produce Ti3+ in the bulk TiO2. In contrast, low temperature plasma treatment for 10 or 20 min generated surface Ti3+ species via the removal of oxygen on both the neat and hydrogenated material. Assessing the photocatalytic activity of the materials demonstrated a 40–130% increase in the rate of formic acid oxidation after plasma treatment. A strong relationship between the Ti3+ content and catalyst activity was established, although a change in the Si–Ti interaction after plasma treating of the neat SiO2/TiO2 material was found to limit performance, and suggests that performance is not determined solely by the presence of Ti3+.

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Narrowing band gap energy of defective black TiO2 fabricated by solution plasma process and its photocatalytic activity on glycerol transformation

Cited by 46 publications

References 59 publications

A two-anode reduction technique to monitor the defect and dope the surface of TiO2 nanotube array as photo-anode for water splitting

A two-anode reduction technique to monitor the defect and dope the surface of TiO2 nanotube array as photo-anode for water splitting

Heterostructured Ag/g‐C₃N₄/TiO₂ with enhanced visible light photocatalytic performances

Plasma Treating Mixed Metal Oxides to Improve Oxidative Performance via Defect Generation

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Narrowing band gap energy of defective black TiO2 fabricated by solution plasma process and its photocatalytic activity on glycerol transformation

Cited by 46 publications

References 59 publications

A two-anode reduction technique to monitor the defect and dope the surface of TiO2 nanotube array as photo-anode for water splitting

A two-anode reduction technique to monitor the defect and dope the surface of TiO2 nanotube array as photo-anode for water splitting

Heterostructured Ag/g‐C3N4/TiO2 with enhanced visible light photocatalytic performances

Plasma Treating Mixed Metal Oxides to Improve Oxidative Performance via Defect Generation

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About

Heterostructured Ag/g‐C₃N₄/TiO₂ with enhanced visible light photocatalytic performances