Is sulfur-doped TiO2 an effective visible light photocatalyst for remediation?

Rockafellow, Erin M.; Stewart, Laine Kincaid; Jenks, William S.

doi:10.1016/j.apcatb.2009.06.027

Cited by 137 publications

(122 citation statements)

References 74 publications

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“…In contrast to quinoline, degradation of AN behaved almost identically with TiO 2 , S-TiO 2 , 29 and Se-TiO 2 . A lower degradation efficiency is noted for both doped catalysts, but product distributions were similar.…”

mentioning

confidence: 91%

“…[22][23][24][25] Main group elements have been a recent focus for TiO 2 modification, and several methods to prepare titania doped with nitrogen, sulfur, and carbon have been published. [9][10][11][26][27][28][29][30][31][32][33][34][35] Visiblelight sensitivity can be a result of localized states within the band gap and induced oxygen vacancies (Ti 3þ states). 26,31 In general, these photocatalysts have shown appreciable visible-light absorbance and some visible-light-induced photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

“…Undoped TiO 2 was prepared using a similar procedure without the selenium source. 29 Using the Se-TiO 2 obtained as described above, it was found that small amounts Se could be detected by ICP-MS in aqueous phase after photocatalytic degradations had been carried out. This was attributed to the hydrolysis of surface-bound Se species.…”

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confidence: 99%

“…For example, we previously reported that S-TiO 2 was less efficient than undoped TiO 2 in the UV-mediated degradation of quinoline. 29 Product analysis of quinoline degradations revealed that HO•-like chemistry was dominant at both pH 3 and pH 6 using Se-TiO 2 . This differed from both Pichat's report using P25 and our results using S-TiO 2 29 and TiO 2 made without dopant.…”

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confidence: 99%

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Selenium-Modified TiO₂and Its Impact on Photocatalysis

Rockafellow¹,

Haywood²,

Witte³

et al. 2010

Langmuir

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This work describes the preparation of a selenium-modified TiO2 photocatalyst and a preliminary evaluation of its photocatalytic activity. Se-TiO2 displayed greater visible absorption than undoped TiO2 and was still capable of degrading quinoline at a slightly faster rate than undoped TiO2 under UV light. Se-TiO2 was also able to degrade organic molecules under purely visible light by a single electron transfer pathway. Irradiation with >435 nm light showed no evidence of efficient production of HO•-like species. Se-TiO2 was also examined under hypoxic conditions, where the Se atoms were capable of trapping photogenerated electrons as evidenced by XPS. This work describes the preparation of a selenium-modified TiO 2 photocatalyst and a preliminary evaluation of its photocatalytic activity. Se-TiO 2 displayed greater visible absorption than undoped TiO 2 and was still capable of degrading quinoline at a slightly faster rate than undoped TiO 2 under UV light. Se-TiO 2 was also able to degrade organic molecules under purely visible light by a single electron transfer pathway. Irradiation with >435 nm light showed no evidence of efficient production of HO•-like species. Se-TiO 2 was also examined under hypoxic conditions, where the Se atoms were capable of trapping photogenerated electrons as evidenced by XPS.

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confidence: 91%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Selenium-Modified TiO₂and Its Impact on Photocatalysis

Rockafellow¹,

Haywood²,

Witte³

et al. 2010

Langmuir

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“…For example, Ohno et al [10] reported that cationic S-doped TiO 2 showed better visible light absorption and photocatalytic activity compared to anionic S-doped TiO 2 ; in contrast, Szatmary et al [11] reported low UV photocatalytic activity of cationic S-doped TiO 2 compared to Degussa P25. Chaudhuri and Paria [12] reported enhanced visible photocatalytic activity of anionic Sdoped TiO 2 , whereas the work of Rockafellow et al [13] showed that sulphur atoms may act as deep hole trappers reducing the oxidizing power of the holes and hindering the generation of hydroxyl radicals. In spite of the extensive reports on cationic and anionic doping of TiO 2 , the visible photocatalytic activity has remained quite low, because monodoping can generate recombination centers for the photoinduced electrons and holes inside the TiO 2 [14].…”

Section: Introductionmentioning

confidence: 99%

Chelated Nitrogen-Sulphur-Codoped TiO₂: Synthesis, Characterization, Mechanistic, and UV/Visible Photocatalytic Studies

Khan

Swati

Younas

et al. 2017

International Journal of Photoenergy

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This study presents in detail the physicochemical, photoluminescent, and photocatalytic properties of carboxylic acid chelated nitrogen-sulphur-codoped TiO 2 . From the Fourier transform infrared spectroscopic study, it was revealed that the formate group formed bidentate bridging linkage while the acetate group coordinated in a bidentate chelating mode with a titanium precursor. In compliance with X-ray diffraction data, the anatase to rutile transformation temperature was extended due to carboxylic acid chelation and NS codoping. Raman analysis indicated four Raman peaks at 146, 392, 512, and 632 cm −1 for the precalcined chelated TiO 2 ; on incorporation with NS dopants, an increase in Raman intensity for these peaks was recorded, indicating the structure stability of the anatase phase. Furthermore, X-ray photoelectron spectroscopic study revealed the presence of anionic doping of nitrogen and cationic doping of sulphur in the lattice of TiO 2 . When evaluating the UV-visible photodegradation rate of 4-chlorophenol, the modified TiO 2 (NS 0.06 -TFA) showed the highest photocatalytic activity. In connection with the activity tests, several scavenger agents were employed to elucidate the significance of the different reactive oxidizing species during the photocatalytic process. Moreover, the transfer pathways of photogenerated carriers and the photocatalytic reaction mechanism of modified TiO 2 were also explained in detail.

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Nanotechnology: Environmental Applications

Pelaez

Cui

Choi

et al. 2012

Encyclopedia of Environmetrics

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Nanomaterials are receiving particular interest due to their novel physical and chemical properties, which are important for a wide range of applications, including environmental remediation. This article presents an overview of the currentadvances on the most relevant nanomaterials and nanotechnologies employed for environmental remediation. Particular emphasis is given to nanostructured semiconductors for photocatalysis; the use of nanomaterials such as nano‐silver, single‐walled carbon nanotubes, fullerenes, and titania for disinfection purposes; reactive metal nanoparticles, in particular zero‐valent iron; ferrate and membrane nanotechnologies. These nanomaterials and nanotechnologies have been used for water and air purification or for the remediation of contaminated groundwater, soil, and sediments.

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Is sulfur-doped TiO2 an effective visible light photocatalyst for remediation?

Cited by 137 publications

References 74 publications

Selenium-Modified TiO₂and Its Impact on Photocatalysis

Selenium-Modified TiO₂and Its Impact on Photocatalysis

Chelated Nitrogen-Sulphur-Codoped TiO₂: Synthesis, Characterization, Mechanistic, and UV/Visible Photocatalytic Studies

Nanotechnology: Environmental Applications

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Is sulfur-doped TiO2 an effective visible light photocatalyst for remediation?

Cited by 137 publications

References 74 publications

Selenium-Modified TiO2and Its Impact on Photocatalysis

Selenium-Modified TiO2and Its Impact on Photocatalysis

Chelated Nitrogen-Sulphur-Codoped TiO2: Synthesis, Characterization, Mechanistic, and UV/Visible Photocatalytic Studies

Nanotechnology: Environmental Applications

Contact Info

Product

Resources

About

Selenium-Modified TiO₂and Its Impact on Photocatalysis

Selenium-Modified TiO₂and Its Impact on Photocatalysis

Chelated Nitrogen-Sulphur-Codoped TiO₂: Synthesis, Characterization, Mechanistic, and UV/Visible Photocatalytic Studies