An innovative ultrasound, Fe2+ and TiO2 photoassisted process for bisphenol a mineralization

Torres-Palma, Ricardo A.; Nieto, Jessica I.; Combet, Evelyne; Pétrier, Christian; Pulgarín, C.

doi:10.1016/j.watres.2009.12.050

Cited by 101 publications

(46 citation statements)

References 32 publications

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“…These technologies include electrocatalysis [35,[136][137][138], sonocatalysis/Fenton process [139], biodegradation [140][141][142][143][144], and wetland technology [145]. The combination of NTO photocatalysis with any of these techniques can not only improve the total efficiency of the degradation but also has the advantage of treating large quantities of wastewater (in real systems), especially with electrocatalysis, biodegradation, and wetland technology.…”

Section: Coupling With Other Treatment Technologiesmentioning

confidence: 99%

“…The removal of bromate by reduction to bromide [137] and the degradation of chlortetracycline [138] in high efficiencies were also achieved by photoelectrocatalysis using Ti/TiO 2 as the photocathode and photoanode, respectively. Another example for the synergic effect of different AOPs is the combined ultrasound-, Fenton-, and TiO 2 -photoassisted mineralization of bisphenol A [139]. By this combined approach, 93% dissolved organic carbon (DOC) removal was achieved, whereas DOC removals by the individual processes were 5, 6, and 22% for TiO 2 photocatalysis, ultrasound, and photo-Fenton, respectively [139].…”

Section: Coupling With Other Treatment Technologiesmentioning

confidence: 99%

“…Another example for the synergic effect of different AOPs is the combined ultrasound-, Fenton-, and TiO 2 -photoassisted mineralization of bisphenol A [139]. By this combined approach, 93% dissolved organic carbon (DOC) removal was achieved, whereas DOC removals by the individual processes were 5, 6, and 22% for TiO 2 photocatalysis, ultrasound, and photo-Fenton, respectively [139]. Here, ultrasound eliminated the initial substrate and provided H 2 O 2 for the photocatalytic reactions.…”

Section: Coupling With Other Treatment Technologiesmentioning

confidence: 99%

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Photocatalytic Water Treatment by Titanium Dioxide: Recent Updates

Varghese²,

2012

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Photocatalytic water treatment using nanocrystalline titanium dioxide (NTO) is a well-known advanced oxidation process (AOP) for environmental remediation. With the in situ generation of electron-hole pairs upon irradiation with light, NTO can mineralize a wide range of organic compounds into harmless end products such as carbon dioxide, water, and inorganic ions. Photocatalytic degradation kinetics of pollutants by NTO is a topic of debate and the mostly reporting Langmuir-Hinshelwood kinetics must accompanied with proper experimental evidences. Different NTO morphologies or surface treatments on NTO can increase the photocatalytic efficiency in degradation reactions. Wisely designed photocatalytic reactors can decrease energy consumption or can avoid post-separation stages in photocatalytic water treatment processes. Doping NTO with metals or non-metals can reduce the band gap of the doped catalyst, enabling light absorption in the visible region. Coupling NTO photocatalysis with other water-treatment technologies can be more beneficial, especially in large-scale treatments. This review describes recent developments in the field of photocatalytic water treatment using NTO.

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Section: Coupling With Other Treatment Technologiesmentioning

confidence: 99%

Section: Coupling With Other Treatment Technologiesmentioning

confidence: 99%

Section: Coupling With Other Treatment Technologiesmentioning

confidence: 99%

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Photocatalytic Water Treatment by Titanium Dioxide: Recent Updates

Varghese²,

2012

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“…Previous results have proved that the combination of different oxidation processes can increase the overall degradation of several pollutants (Agustina et al 2005;Augugliaro et al 2006). However, very few papers are devoted to the application of combined AOPs to endocrine disruptors removal (Guo and Feng 2009;Rivas et al 2009;Torres-Palma et al 2010).…”

Section: Introductionmentioning

confidence: 99%

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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“…Various studies have used different AOPs to treat BPA, including ozone [8,9], UV/ozone [8], UV/TiO 2 [10][11][12][13][14], visible-light/TiO 2 [15][16][17], sunlight/TiO 2 [18], UV/Zr-TiO 2 [19], UV/Pt-TiO 2 [12], UV/Au-TiO 2 [13], Fenton [14,20,21], UV/Fenton [20], ultrasound (US) [22,23], US/Fenton [21], US/TiO 2 /Fe 2+ [14], visible-light/N-TiO 2 [17], and visiblelight/C-N-TiO 2 [24,25] systems. Notably, BPA can be readily eliminated by the US process (∼90 min); however, over 80% of the total organic carbon (TOC) remained in the solution after US irradiation for 9 h [23].…”

Section: Introductionmentioning

confidence: 99%

Preparation of N-TiO2Using a Microwave/Sol-Gel Method and Its Photocatalytic Activity for Bisphenol A under Visible-Light and Sunlight Irradiation

Kuo

Lin

et al. 2013

International Journal of Photoenergy

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This study applied the microwave/sol-gel method to prepare nitrogen-doped TiO 2 (N-TiO 2 ). The N-TiO 2 was immobilized in glass balls to form N-TiO 2 /glass beads and applied to degrade Bisphenol A (BPA) under visible-light and sunlight irradiation. The characteristics of the prepared photocatalysts were analyzed by X-ray diffraction (XRD), UV-Vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). Experimental results demonstrate that the percentage of anatase increased as the amount of N in N-TiO 2 increased. Compared with the undoped TiO 2 (420 nm), spectra show that the absorption edge shifted to a longer wavelength (445 nm) after N doping. The XPS characterization confirms the substitution of crystal lattice O to N species in N-TiO 2 , forming Ti-O-N and N-Ti-O. With an increased N/Ti ratio, photodegradation efficiency increased and then decreased; moreover, the optimal amount for N doping was determined as an N/Ti mole ratio of 0.08 (0.1 NT). The efficiency of 0.1 NT in doing BPA photodegradation was greater than that of Degussa P25. After reaction for 61 min, the mineralization percentage of 0.1 NT under visible-light irradiation reached 41%. Photocatalyst efficiency decreased as the number of repeats increased in the visible-light/N-TiO 2 system; however, these systems were stable during reaction.

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An innovative ultrasound, Fe2+ and TiO2 photoassisted process for bisphenol a mineralization

Cited by 101 publications

References 32 publications

Photocatalytic Water Treatment by Titanium Dioxide: Recent Updates

Photocatalytic Water Treatment by Titanium Dioxide: Recent Updates

Bisphenol A endocrine disruptor complete degradation using TiO2 photocatalysis with ozone

Preparation of N-TiO2Using a Microwave/Sol-Gel Method and Its Photocatalytic Activity for Bisphenol A under Visible-Light and Sunlight Irradiation

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