Synthesis and photocatalytic activity of N-doped TiO2/ZrO2 visible-light photocatalysts

Cha, Ji-An; An, Sang-Hun; Jang, Hee-Jin; Kim, Chan-Soo; Song, Dong Keun; Kim, Tae-Oh

doi:10.1016/j.apt.2011.09.003

Cited by 33 publications

(17 citation statements)

References 33 publications

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“…8). IMPS indicates electron transfer time of the excited electrons and IMVS refers the time for excited electrons to be recombined to electrolytes and dyes, which is designated as electron life time or recombination time [26,27].…”

Section: Resultsmentioning

confidence: 99%

Copper and nitrogen doping on TiO2 photoelectrodes and their functions in dye-sensitized solar cells

Park

Kim

Okuyama

et al. 2016

Journal of Power Sources

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Section: Resultsmentioning

confidence: 99%

Copper and nitrogen doping on TiO2 photoelectrodes and their functions in dye-sensitized solar cells

Park

Kim

Okuyama

et al. 2016

Journal of Power Sources

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“…For example, Yuan et al 17 reported mesoporous TiO 2 -ZrO 2 nanocomposites with photocatalytic activity in degradation of rhodamine-B. Cha et al 18 prepared N-doped ZrO 2 /TiO 2 photocatalysts with enhanced photocatalytic degradation of NO. As far as we know, the coupling of nano-ZrO 2 with g-C 3 N 4 as a kind of photocatalyst to remove organic pollutant has been seldom observed.…”

Section: Introductionmentioning

confidence: 98%

ZrO₂/g-C₃N₄ with enhanced photocatalytic degradation of methylene blue under visible light irradiation

Guo

Wang

et al. 2014

J. Mater. Res.

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The ZrO 2 and graphitic carbon nitride (g-C 3 N 4 ) composite photocatalyst has been prepared by calcination process and hydrothermal treatment. The photocatalyst was characterized by x-ray diffraction, scanning electron microscopy, x-ray photoelectron spectroscopy, UV-vis diffuse reflection spectroscopy, Brunauer-Emmett-Teller and photoluminescence spectra. The photocatalytic activity of the photocatalysts was evaluated by degradation of methylene blue under visible light irradiation. The results showed that the activity of the composite photocatalyst ZrO 2 /g-C 3 N 4 for photodegradation of MB is much higher than that of either pure g-C 3 N 4 or ZrO 2 , which is ascribed to the effective electron-hole separation based on the photoluminescence spectra. The dO 2 À might be the main active species in MB photodegradation, and the dOH and photogenerated electrons are also partly involved in the process of photocatalytic degradation.

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“…Sputtering for 15 s led to cleaning of the superficial layer and the energy of the N 1 s peak increased to 400.5 eV. According to the literature, this peak can be attributed to the environment O‐Ti‐N, or the states of nitrogen doped in titania might be various and coexist in the form N‐Ti‐O and Ti‐O‐N . O 1 s shows a certain asymmetry due to the fact that it has contributions of two peaks, located at 530 and 531 eV.…”

Section: Resultsmentioning

confidence: 98%

“…On one hand, N doping involves a decrease in the band gap energy and, as a consequence, higher photolytic activity. On the other hand, an increase in particle diameter (lower specific area), formation of TiN (non‐transparent), and the number of oxygen vacancies (electron–hole recombination sites) are related to high N doping photocatalysts . In any case, this subject is controversial: some authors claim that N doping decreases particle size while electron–hole recombination is prevented by oxygen vacancies (photoluminescence intensity minimization) An increase in BET surface area as N percentage reaches a determined value has been reported, values above the optimum lead to a BET area decrease …”

Section: Resultsmentioning

confidence: 99%

Photocatalytic ozonation of pyridine‐based herbicides by N‐doped titania

Solís

Rivas

Gimeno

et al. 2015

J of Chemical Tech & Biotech

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BACKGROUND A mixture of three pyridine herbicides in water (clopyralid, triclopyr and picloram) has been treated with photocatalytic processes, involving oxygen or ozone. Nitrogen doped and undoped titania were used in the process. Toxicity evolution during photocatalytic ozonation was monitored considering BOD, Daphnia parvula and fitotoxicity trials. RESULTS N doped titania with an optimized photoactivity was tested in photocatalytic ozonation, leading to nearly 95% mineralization in 180 min. This catalyst was characterized by SEM, TEM, XRD and XPS techniques (13.5 nm crystal size, anatase phase, 1% N, and formation of O‐Ti‐N linkage). No loss of photocatalytic activity was observed after five consecutive runs. Although no toxicity from the parent compounds was observed, this parameter increased during the early stages of the oxidation process. When parent compounds were totally degraded and dechlorination was completed, toxicity decayed again to negligible values. CONCLUSION N doping improves bare titania photoactivity through an optimum amount of N. Photocatalysis/ozone showed better behavior than photocatalysis/oxygen in herbicide removal and mineralization, and no significant loss of activity was observed after five runs. Toxicity initially increased due to toxic byproducts formation; however, it decreased after their abatement. © 2015 Society of Chemical Industry

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Synthesis and photocatalytic activity of N-doped TiO2/ZrO2 visible-light photocatalysts

Cited by 33 publications

References 33 publications

Copper and nitrogen doping on TiO2 photoelectrodes and their functions in dye-sensitized solar cells

Copper and nitrogen doping on TiO2 photoelectrodes and their functions in dye-sensitized solar cells

ZrO₂/g-C₃N₄ with enhanced photocatalytic degradation of methylene blue under visible light irradiation

Photocatalytic ozonation of pyridine‐based herbicides by N‐doped titania

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Synthesis and photocatalytic activity of N-doped TiO2/ZrO2 visible-light photocatalysts

Cited by 33 publications

References 33 publications

Copper and nitrogen doping on TiO2 photoelectrodes and their functions in dye-sensitized solar cells

Copper and nitrogen doping on TiO2 photoelectrodes and their functions in dye-sensitized solar cells

ZrO2/g-C3N4 with enhanced photocatalytic degradation of methylene blue under visible light irradiation

Photocatalytic ozonation of pyridine‐based herbicides by N‐doped titania

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ZrO₂/g-C₃N₄ with enhanced photocatalytic degradation of methylene blue under visible light irradiation