Photocatalytical Degradation of Toluene and Cyclohexane Using LED Illumination

Mioduska, Joanna; Zielińska‐Jurek, Anna; Hupka, Jan

doi:10.15244/pjoes/67533

Cited by 5 publications

(2 citation statements)

References 14 publications

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“…The photocatalytic activity of the electrochemically deposited photocatalysts was determined according to the procedure described earlier [30,31]. Two model compounds (150 ppm cyclohexane and 100 ppm toluene) were decomposed in air.…”

Section: Characterization Of the Deposited Filmsmentioning

confidence: 99%

Photocatalytic Decomposition of Air Pollutants Using Electrodeposited Photocatalysts on Stainless Steel

Hánel¹,

Janczarek²,

Lieder³

et al. 2019

Pol. J. Environ. Stud.

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The aim of our research was to develop an immobilization method for photocatalysts that is an alternative to the sol-gel or dip-coating methods and can be simply scaled up for technical applications. The investigated photocatalyst was TiO 2 , which was electrochemically deposited onto a cathode made of stainless steel. This deposited film was photocatalytically active. In order to enhance the photoactivity of the TiO 2 film, commercially available P25 photocatalyst nanoparticles were occluded into the film. The effect of deposition current density as well as the amount of occluded nanoparticles on the photocatalytic activity and photoelectrochemical behavior was investigated. The photocatalytic activity was evaluated in a UV-LED reactor. The decomposition rate of toluene and cyclohexane in air was examined for all prepared stainless steel-photocatalyst composites. It was observed that deposits prepared with 5 g dm-3 of P25 in the deposition bath showed the best photocatalytic activity and highest photocurrent.

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Section: Characterization Of the Deposited Filmsmentioning

confidence: 99%

Photocatalytic Decomposition of Air Pollutants Using Electrodeposited Photocatalysts on Stainless Steel

Hánel¹,

Janczarek²,

Lieder³

et al. 2019

Pol. J. Environ. Stud.

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“…Although TiO 2 exists in 3 polymorphs (anatase, rutile, and brookite), only the first two have value in photocatalysis [10]. When illuminated with light of wavelength ≤380 nm, the TiO 2 particle (anatase form) produces excited-state electrons and hole pairs (e C …”

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confidence: 99%

Effective Removal of Humic Acid Using Strontium-Doped TiO2 Coated on Porous Ceramic Filter Media in Water Resource

Tung¹,

Xu²,

Zhang³

et al. 2018

Pol. J. Environ. Stud.

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Humic substances are among the most important natural organic matters (NOM) existing in ground and surface waters and are known as one of the main disinfection by-product (DBPs) precursors that may act as health risk factors [1]. Humic substances -mainly humic acids (HA), which constitute the major fraction of NOM in water supplies -have been suggested as a standard for mimicking NOM in the laboratory. HA are non-biodegradable and have color, odor, and also exhibit a wide range of distribution in molecular weight and Pol. J. Environ. Stud. Vol. 27, No. 6 (2018), 2765-2774 AbstractA photocatalyst comprised of strontium-doped TiO 2 coated on porous ceramic filter media (Sr-TiO 2 /PCFM) was prepared using the heat-treated process. The main objective of this study was to investigate the effects of catalyst dosage, initial HA concentrations, pH, and temperature on the adsorption and degradation of humic acid (HA) in a solution containing Sr-TiO 2 /PCFM under irradiation of UV light. Removal efficiency of 84.25% for HA was achieved under experimental conditions for a Sr-TiO 2 /PCFM dosage of 80 g at an initial concentration of 15 mg/L over a period of 8 h. Higher degradation was found for HA in the acidic environment and at higher operating temperatures. The rate of the adsorption reaction followed the pseudo second-order kinetics with the sorption isotherm well fitted to the Freundlich and Langmuir isotherm models. The oxidation rate constants of HA were evaluated by using pseudo first-order kinetics that can describe the photodegradation process. Furthermore, the photocatalytic stability of Sr-TiO 2 /PCFM was performed with 3 cycles reused. These findings suggest that the Sr-TiO 2 /PCFM was found to be an effective and promising approach to eliminating HA in water resources.

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Photodegradation of cyclohexane and toluene using TiO2/UV/O3 in gas phase

Marchiori

Doubek

Ribeiro

et al. 2018

Environ Sci Pollut Res

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Volatile organic compounds (VOC) are air pollutants usually found in urban and industrial areas. Heterogeneous photocatalysis is an interesting technique used to degrade these compounds. Several approaches may enhance this process; some studies have shown higher VOC conversions by adding ozone to the experimental system, once ozone increases the number of reactive radicals in the reaction. In this context, this work studied the conversion of cyclohexane and toluene by heterogeneous photocatalysis in gas phase, in the presence of titanium dioxide (TiO), UV light, and different concentrations of ozone. For fixed space times from 13.1 to 48.8 s, an average increase of 9% was reached in cyclohexane conversion when comparing the system with maximum concentration of ozone (0.8%) and the system without it. In addition, difference of less than 2% in the conversion of cyclohexane with different moisture fractions was observed. Toluene photodegradation was also analyzed in the presence of ozone and although the conversion was only about 40% for the space time of 25 s, this result was maintained during 4 h of experiment, with no catalyst deactivation as usually reported in the literature for aromatic compounds. Based on the results, ozone addition is an advantageous technique to improve the photodegradation of VOC.

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Photocatalytical Degradation of Toluene and Cyclohexane Using LED Illumination

Cited by 5 publications

References 14 publications

Photocatalytic Decomposition of Air Pollutants Using Electrodeposited Photocatalysts on Stainless Steel

Photocatalytic Decomposition of Air Pollutants Using Electrodeposited Photocatalysts on Stainless Steel

Effective Removal of Humic Acid Using Strontium-Doped TiO2 Coated on Porous Ceramic Filter Media in Water Resource

Photodegradation of cyclohexane and toluene using TiO2/UV/O3 in gas phase

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