Remediation of simulated aquatic sites contaminated with recalcitrant substrates by TiO2/ozonation under natural sunlight

Ōyama, Toshiyuki; Yanagisawa, Ippei; Takeuchi, Masashi; Koike, Takayoshi; Serpone, Nick; Hidaka, Hisao

doi:10.1016/j.apcatb.2009.05.031

Cited by 34 publications

(13 citation statements)

References 13 publications

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“…Before testing the combined processes, the solution was treated with O 3 for 90 min to allow a complete ozone solubilization. The ozone flow rate (30 L h -1 ), determined ex situ analytically as reported by Oyama et al (2009), was maintained throughout the duration of the degradation test in order to keep a constant dissolved ozone concentration of 3 mg L -1 . The photon sources for the photodegradation tests were provided by two 500 W iron halogenide lamps (Jelosil, model HG 500) emitting in the 315-400 nm wavelength range, photon flux 27 mW cm -2 (measured by Thorlabs S314C), symmetrically placed with respect to the Al/TiO 2 lamina by adopting a disposition similar to that previously reported (Ardizzone et al 2011).…”

Section: Photocatalytic Apparatusmentioning

confidence: 99%

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Bisphenol A endocrine disruptor complete degradation using TiO2 photocatalysis with ozone

et al. 2011

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Bisphenol A is an endocrine disruptor. Complete mineralization of bisphenol A is therefore a primary environmental issue. Here, the combination of ozonation and photocatalysis by TiO 2 is proposed for the degradation and final mineralization of bisphenol A. TiO 2 films deposited onto two sides of an Al lamina show good stability and high surface roughness. We used a specific experimental setup employing two facing ultraviolet lamps and TiO 2 layers, together with an ozone flux. High-performance liquid chromatography-mass spectrometry determinations on bisphenol A solutions sampled at different reaction times and Fourier Transform Infrared analyses of the oxide at the end of the reaction were performed to study the reaction intermediates and the overall degradation mechanism. Our results show that pollutant mineralization achieved with the combined method is far higher, of 55% in the case of 0.3 mM bisphenol A, than those obtained by individual treatments such as photolysis (\3%), ozonation (6%), photocatalysis (6%), and by other combined processes: photolytic ozonation (13%) and catalytic ozonation (15%). This finding is explained by the occurrence of highly synergistic effects.

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Section: Photocatalytic Apparatusmentioning

confidence: 99%

“…With respect to previous studies (Rivas et al 2009;Oyama et al 2009), TiO 2 thin films are employed instead of slurries, avoiding highly expensive filtration steps and the loss of radiation intensity due to the cloudiness of the suspension.…”

Section: Introductionmentioning

confidence: 99%

Bisphenol A endocrine disruptor complete degradation using TiO2 photocatalysis with ozone

et al. 2011

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“…Even if ozonation is an appropriate candidate for this purpose, just recently started to apply this combined procedure for the degradation of these pollutants (Oyama et al 2009). It has currently been observed in our laboratory that combination of heterogeneous photocatalysis with ozonation results in a synergistic effect in the increase of the mineralization rate of benzenesulfonate (Zsilák et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Degradation of industrial surfactants by photocatalysis combined with ozonation

Zsilák

Fónagy

Szabó-Bárdos

et al. 2014

Environ Sci Pollut Res

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The efficiency of titanium dioxide-mediated photocatalytic degradation of pollutants can be enhanced by combination with another advanced oxidation procedure such as ozonation.Mineralization of hydroxy-and dihydroxybenzenesulfonate based on these methods, both individually and combined, was investigated by monitoring the total organic carbon (TOC) content, sulfate concentration, pH, HPLC as well as the absorption spectral changes. The mineralization efficiency of the combined procedure significantly exceeded the sum of those of the individual techniques. The comparison of the disappearance of the starting material and the formation of the sulfate ions indicates that desulfonation is not the primary step of the degradation. Moreover, in the case of the combined method, ring-cleavage, and thus, partial mineralization can occur without desulfonation. Efficient degradation of other, widely used industrial surfactants, such as alkylbenzene sulfonates and alkyl ether sulfates, was also achieved by heterogeneous photocatalysis combined with ozonation, offering an applicable method for the removal of these pollutants.

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“…The difference in activity of the electrodes may be due to the concentration of ozone and the other oxidative intermediates. [1,13,14] In conclusion, the superiority of BDD microelectrodes over simple and easy-to-handle pinpoint ozone-water production unit, in terms of larger activities for the production of ozone and disinfection, was demonstrated with conventional methods and conditions. We are currently preparing more practical treatment tests, for example, biofilm degradation with smaller BDD microelectrodes.…”

mentioning

confidence: 93%

Application of Boron‐Doped Diamond Microelectrodes for Dental Treatment with Pinpoint Ozone‐Water Production

Ochiai¹,

Ishii²,

Tago³

et al. 2012

ChemPhysChem

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Remediation of simulated aquatic sites contaminated with recalcitrant substrates by TiO2/ozonation under natural sunlight

Cited by 34 publications

References 13 publications

Bisphenol A endocrine disruptor complete degradation using TiO2 photocatalysis with ozone

Bisphenol A endocrine disruptor complete degradation using TiO2 photocatalysis with ozone

Degradation of industrial surfactants by photocatalysis combined with ozonation

Application of Boron‐Doped Diamond Microelectrodes for Dental Treatment with Pinpoint Ozone‐Water Production

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