(Mo+N) codoped TiO2 for enhanced visible-light photoactivity

Liu, Hailin; Lu, Zhihong; Yue, Ling; Liu, Jing; Gan, Zhanghua; Shu, Chen; Zhang, Ting; Shi, Jing; Xiong, Rui

doi:10.1016/j.apsusc.2011.05.085

Cited by 50 publications

(26 citation statements)

References 24 publications

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“…Nevertheless, up to date, there is only indirect experimental evidence for the effects of codoping for PEC water splitting. For example, a number of metal/anion codoping pairs were shown to improve the photocatalytic activities of TiO 2 for organic pollutant decomposition due to enhanced visible-light absorption and charge separation [22][23][24][25][26][27] . Codoping ZnO with (Ga, N) led to highly conductive p-type ZnO film 28 , and improved PEC performance because of enhanced visible-light absorption and crystallinity 29 .…”

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confidence: 99%

Codoping titanium dioxide nanowires with tungsten and carbon for enhanced photoelectrochemical performance

et al. 2013

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Recent density-functional theory calculations suggest that codoping TiO 2 with donoracceptor pairs is more effective than monodoping for improving photoelectrochemical water-splitting performance because codoping can reduce charge recombination, improve material quality, enhance light absorption and increase solubility limits of dopants. Here we report a novel ex-situ method to codope TiO 2 with tungsten and carbon (W, C) by sequentially annealing W-precursor-coated TiO 2 nanowires in flame and carbon monoxide gas. The unique advantages of flame annealing are that the high temperature (41,000°C) and fast heating rate of flame enable rapid diffusion of W into TiO 2 without damaging the nanowire morphology and crystallinity. This is the first experimental demonstration that codoped TiO 2 :(W, C) nanowires outperform monodoped TiO 2 :W and TiO 2 :C and double the saturation photocurrent of undoped TiO 2 for photoelectrochemical water splitting. Such significant performance enhancement originates from a greatly improved electrical conductivity and activity for oxygen-evolution reaction due to the synergistic effects of codoping.

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confidence: 99%

Codoping titanium dioxide nanowires with tungsten and carbon for enhanced photoelectrochemical performance

et al. 2013

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“…As no noticeable band-gap shift towards the visible range was observed, the increased photocatalytic activity under the fluorescent light source could only be attributed to improved electronehole The results of the XPS showed that the presence of molybdenum has a significant influence on the content of nitrogen in the coatings and its position. As shown by Liu et al, co-doping with N and Mo increases the solubility limits of both N and Mo in TiO 2 [7]. This effect is described as being more pronounced in the case of nitrogen, as the solubility of N in titania is usually very low.…”

Section: Discussionmentioning

confidence: 85%

“…Doping with transition metal ions is reported to create impurity levels near the conduction band, that may perform as trapping centres, which extend the lifetime of photogenerated electrons and holes [7]. At present, there is no uniform theory explaining the choice of the doping element to maximise the photocatalytic properties in the visible range.…”

Section: Introductionmentioning

confidence: 99%

“…Nitrogen is typically used as the nonmetallic element, while the metals chosen may vary. Several works have recently been published on the co-doping of titanium dioxide with both molybdenum and nitrogen, using a variety of methods to produce the coatings, such as solegel [7], hydrolysis-precipitation [14], etc. However, in this work, titanium dioxide coatings codoped with molybdenum and nitrogen were deposited by reactive magnetron sputtering.…”

Section: Introductionmentioning

confidence: 99%

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Synergistic effect of doping with nitrogen and molybdenum on the photocatalytic properties of thin titania films

Ratova

West

Kelly

et al. 2015

Vacuum

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a b s t r a c tDoping of titania with metal and non-metal elements provides a simple and efficient pathway to significant enhancement of photocatalytic properties. In this work titania thin films co-doped with molybdenum and nitrogen were prepared by reactive magnetron sputtering. Additionally, coatings doped only with nitrogen were prepared under identical deposition conditions for comparison purposes. Coatings were annealed at 873 K in air and analysed by Raman spectroscopy, XRD and XPS. Photocatalytic properties of the coatings were evaluated on the basis of the photodegradation rate of methylene blue dye under UV, fluorescent and visible light. It was found that the photocatalytic activity of codoped samples was significantly higher than that of N-doped coatings. Unlike N-doped titania films, codoped coatings exhibited high photocatalytic activity under the fluorescent light source and noticeable activity under visible light. The possible mechanism for the enhancement of the photocatalytic activity of MoeN co-doped titania coatings is discussed.

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“…Akbarzadeh and Javadpour 37 synthesized W/Mo codoped TiO 2 photocatalyst for enhancement of Methylene Blue removal under sunlight. Liu et al 38 reported that Mo-N/TiO 2 photocatalyst, which was synthesized by sol-gel method, had higher activity than undoped and Mo-or N-doped TiO 2 catalyst.…”

Section: Introductionmentioning

confidence: 99%

Visible Light Photocatalytic Degradation of Azo Dye and a Real Textile Wastewater Using Mn, Mo, La/TiO2 /AC Nanocomposite

Jorfi¹

2018

Chem.Biochem.Eng.Q.

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Mn, Mo, La/TiO 2 /activated carbon (AC) photocatalysts were synthesized by sol-gel method. The prepared samples were characterized by XRD, FT-IR, BET, DRS, and FE-SEM techniques. The findings revealed that the synthesized catalysts were anatase type and nano-sized particles. The catalysts exhibited high adsorption ability in the visible light region with a red shift in the adsorption edge. The formation of Mn, Mo, La/TiO 2 / AC crystallites in the activated carbon was confirmed by FE-SEM. The effects of initial dye concentration, catalyst dosage, reaction time, and solution pH were investigated for removal of Reactive Red 198. According to the obtained results, the maximum removal efficiency of 91 % was obtained at initial dye concentration of 20 mg L -1 , pH of 3, and catalyst concentration of 2 g L -1 . Synthesized nano-photocatalyst showed reasonable photo degradation efficiency of 84 % for initial COD concentration of 4700 mg L -1 in treatment of a real textile wastewater sample. GC/MS analysis of raw and treated wastewater confirmed degradation and producing of simple intermediates during the photocatalytic process.

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(Mo+N) codoped TiO2 for enhanced visible-light photoactivity

Cited by 50 publications

References 24 publications

Codoping titanium dioxide nanowires with tungsten and carbon for enhanced photoelectrochemical performance

Codoping titanium dioxide nanowires with tungsten and carbon for enhanced photoelectrochemical performance

Synergistic effect of doping with nitrogen and molybdenum on the photocatalytic properties of thin titania films

Visible Light Photocatalytic Degradation of Azo Dye and a Real Textile Wastewater Using Mn, Mo, La/TiO2 /AC Nanocomposite

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