Kinetic modeling of photocatalytic degradation reactions: Effect of charge trapping

Jarandehei, Asefeh; Golpayegani, Mojgan Karimi; Visscher, Alex De

doi:10.1016/j.apcatb.2008.03.006

Cited by 8 publications

(3 citation statements)

References 51 publications

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“…This process is known as recombination. [82,83] It is facilitated by lattice defects, crystal imperfections and impurities. [84] According to Hoffmann et al, [85] charge recombination is a semi-fast process occurring on a time scale of 10-100 ns, whereas the initial charge generation is very fast (fs time scale) and interfacial charge transfer is rather slow …”

Section: )mentioning

confidence: 99%

TiO2 photocatalysis for the degradation of pollutants in gas phase: From morphological design to plasmonic enhancement

Verbruggen

2015

Journal of Photochemistry and Photobiology C: Photochemistry Re

291

123

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Please cite this article as: S.W. Verbruggen, TiO 2 photocatalysis for the degradation of pollutants in gas phase: from morphological design to plasmonic enhancement, Journal of Photochemistry and Photobiology C:Photochemistry Reviews (2015), http://dx. ABSTRACTTiO 2 -based photocatalysis has become a viable technology in various application fields such as (waste)water purification, photovoltaics/artificial photosynthesis, environmentally friendly organic synthesis and remediation of air pollution. Because of the increasing impact of bad air quality worldwide, this review focuses on the use and optimization of TiO 2 -based photocatalysts for gas phase applications. Over the past years various specific aspects of TiO 2 photocatalysis have been reviewed individually. The intent of this review is to offer a broad tutorial on (recent) trends in TiO 2 photocatalyst modification for the intensification of photocatalytic air treatment. After briefly introducing the fundamentals of photocatalysis, TiO 2 photocatalyst modification is discussed both on a morphological as well as an electronic level from the perspective of gas phase applications. The main focus is laid on recent developments, but also possible opportunities to the field. This review is intended as a solid introduction for researchers new to the field, as well as a summarizing update for established investigators.

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Section: )mentioning

confidence: 99%

TiO2 photocatalysis for the degradation of pollutants in gas phase: From morphological design to plasmonic enhancement

Verbruggen

2015

Journal of Photochemistry and Photobiology C: Photochemistry Re

291

123

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“…Trichloroethylene oxidation in gas phase has been carried out in a flat-plate photoreactor at inlet concentrations of 100-500 ppm, relative humidities (RH) of 0-62%, gas residence times of 2.5-60.3 s, and incident irradiance of 2.86 × 10 −4 meinstein g −1 s −1 [37][38][39][40]. In the first step, trichloroethylene converts to dichloroacetyl chloride (Cl 2 CHCClO) and in the second one dichloroacetyl chloride converts to phosgene (COCl 2 ), CO 2 and Cl 2 with the aid of one electron-hole pair [37]: Literature reports a mechanism mediated by OH radicals formed by holes attacking adsorbed water, whereas other researchers found the highest photocatalytic degradation rate of trichloroethylene in the absence of water [41]. Two mechanisms, indeed, can be responsible for the inhibitive effect of water: competitive adsorption of water and trichloroethylene on the catalyst surface, and inhibition of an oxidative chain reaction involving the chlorine radical.…”

Section: Aliphatic Oxidationmentioning

confidence: 99%

Overview on oxidation mechanisms of organic compounds by TiO2 in heterogeneous photocatalysis

Augugliaro¹,

Bellardita²,

Loddo³

et al. 2012

Journal of Photochemistry and Photobiology C: Photochemistry Re

291

121

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: http://www.elsevier.com/copyright

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“…The extracted contaminants may be treated using advanced oxidation process(AOPs). The heterogeneous photocatalytic degradation of contaminants using TiO 2 is a promising alternative technology that is an inexpensive, environment-friendly, and can be combined with solar energy/artificial light to enhance degradation [13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Photocatalytic Degradation of Triton X-100 in Aqueous TiO2 Suspensions

Zhang¹

2014

AJEP

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The increasing utilization of surfactants generates a great amount of wastes. Surfactants and their more toxic degradation by-products in the environment affect the biota greatly. In particular, the low biodegradation of nonionic surfactants requires efficient oxidation treatments. In addition, the extracted contaminants by high concentrations of non-ionic surfactants in soil remediation may be completely treated using advanced oxidation process and thus the degradation of non-ionic surfactants needs to be checked in this case. The photocatalytic degradation of Triton X-100, a non-ionic surfactant, in aqueous titania suspensions was investigated as a function of catalyst dosage, pH, addition of hydrogen peroxide, potassium persulfate, and Tert-butyl alcohol. For the treatment of 20 mg/L Triton X-100 solutions, the optimum catalyst dosage and pH were determined to be 1 g/L and 6, respectively. The degradation efficiency of Triton X-100 by potassium persulfate was higher than that by hydrogen peroxide when the same mol of oxidants were used. Tert-butyl alcohol can strongly inhibit the photocatalytic oxidation reactions of Triton X-100. The degradation rates as a function of initial surfactant concentrations were interpreted by using a Langmuir-Hinshelwood model. With 0.2 g/L titania or even an additional 0.1 g/L hydrogen peroxide to completely degrade 1 mg/L phenanthrene in a 2 g/L Triton X-100 solution within 30 min, in this case the degradation efficiency of Triton X-100 was less than 5%. This proved that the strategy that surfactants were used as solubilizing agents for the removal of contaminants from soils followed by heterogeneous photocatalytic degradation was feasible.Within 120 min, 2 g/L of Triton X-100 can be degraded up to 67% by the addition of both 1 g/L titania and 1 g/L hydrogen peroxide. Under the right conditions, Triton X-100 can be completely degraded.

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Kinetic modeling of photocatalytic degradation reactions: Effect of charge trapping

Cited by 8 publications

References 51 publications

TiO2 photocatalysis for the degradation of pollutants in gas phase: From morphological design to plasmonic enhancement

TiO2 photocatalysis for the degradation of pollutants in gas phase: From morphological design to plasmonic enhancement

Overview on oxidation mechanisms of organic compounds by TiO2 in heterogeneous photocatalysis

Heterogeneous Photocatalytic Degradation of Triton X-100 in Aqueous TiO2 Suspensions

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