Boron doped TiO2 catalysts for photocatalytic ozonation of aqueous mixtures of common pesticides: Diuron, o-phenylphenol, MCPA and terbuthylazine

Quiñones, Diego H.; Rey, Ana; Álvarez, Pedro M.; Beltrán, Fernando J.; Puma, Gianluca Li

doi:10.1016/j.apcatb.2014.10.036

Cited by 118 publications

(33 citation statements)

References 36 publications

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“…In photolytic (UV) and UV/H2O2 treatments the abatement of TBA is due mainly to direct photolysis or oxidation by hydroxyl radicals, generated from the photolysis of H2O2 (Alvarez et al 2016). Direct photolysis of 5 mg L -1 of TBA in a 250 mL reactor did not produce significant degradation (Quinones et al 2015), while the removal rate increased significantly in the UV254/H2O2 combined process.…”

Section: Uv and Uv/h2o2 Photodegradationmentioning

confidence: 99%

“…Solar-driven advanced oxidation processes, in which solar energy is used to activate a semiconductor, have recently attracted growing attention in water treatment applications (Quinones et al 2015). A 250 mL reactor was charged with an aqueous solution of TBA (5.0 mg L −1 ) and irradiated by a solar simulator, providing an irradiance at the solution level of 581 W m −2 .…”

Section: Solar Aopsmentioning

confidence: 99%

“…The adsorption capacity increased in the doped catalysts, and is probably due to their higher surface areas. The combination of ozonation and photocatalysis, obtained by a mixture of ozone-oxygen (5 mg L −1 ozone concentration), fed to the reactor at a flow rate of 10 L h −1 , led to 100% removal of the pesticides within 90 min, with 75% mineralization after 2 h (Quinones et al 2015). The formation of H2O2 and its behaviour as an electron acceptor on the TiO2 surface was experimentally confirmed, as O3 is confirmed to be photolysed, giving rise to many other reactive oxygen species, which enhance the mineralization rate (Sanchez et al 2003).…”

Section: Solar Aopsmentioning

confidence: 99%

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Terbuthylazine and desethylterbuthylazine: Recent occurrence, mobility and removal techniques

2018

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The herbicide terbuthylazine (TBA) has displaced atrazine in most of EU countries, becoming one of the most regularly used pesticides and, therefore, frequently detected in natural waters. The affinity of TBA for soil organic matter suggests prolonged contamination; degradation leads to the release of the metabolite desethylterbuthylazine (DET), which has higher water solubility and binds more weakly to organic matter compared to the parent compound, resulting in higher associated risk for contamination of groundwater resources. Additionally, TBA and DET are chemicals of emerging concern because of their persistence and toxicity towards aquatic organisms; moreover, they are known to have significant endocrine disruption capacity to wildlife and humans. Conventional treatments applied during drinking water production do not lead to the complete removal of these chemicals; activated carbon provides the greatest efficiency, whereas ozonation can generate by-products with comparable oestrogenic activity to atrazine. Hydrogen peroxide alone is ineffective to degrade TBA, while UV/HO advanced oxidation and photocatalysis are the most effective processes for oxidation of TBA. It has been determined that direct photolysis gives the highest degradation efficiency of all UV/HO treatments, while most of the photocatalytic degradation is attributed to OH radicals, and TiO solar-photocatalytic ozonation can lead to almost complete TBA removal in ∼30 min. Constructed wetlands provide a valuable buffer capacity, protecting downstream surface waters from contaminated runoff. TBA and DET occurrence are summarized and removal techniques are critically evaluated and compared, to provide the reader with a comprehensive guide to state-of-the-art TBA removal and potential future treatments.

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Section: Uv and Uv/h2o2 Photodegradationmentioning

confidence: 99%

Section: Solar Aopsmentioning

confidence: 99%

Section: Solar Aopsmentioning

confidence: 99%

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Terbuthylazine and desethylterbuthylazine: Recent occurrence, mobility and removal techniques

2018

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“…photocatalysis, of various emerging contaminants in natural water matrices. These studies reported high removal rates for pharmaceuticals and pesticides (He, Sutton, Rijnaarts, & Langenhoff, 2016;Prieto-Rodriguez et al, 2012;Quiñones, Rey, Alvarez, Beltr an, & Li Puma, 2015). Lab-scale combinations of subsurface flow CWs and photocatalysis were successful in the removal of these contaminants as well.…”

Section: Cw Design Considerationsmentioning

confidence: 95%

A review on the removal of conditioning chemicals from cooling tower water in constructed wetlands

Wagner

Parsons

Rijnaarts

et al. 2018

Critical Reviews in Environmental Science and Technology

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Large volumes of freshwater are used globally for cooling towers. The reuse of discharged cooling tower water in cooling towers itself could mitigate freshwater scarcity problems. Prior to its reuse, the cooling tower blowdown has to be desalinated. However, physicochemical desalination techniques are hampered by conditioning chemicals (CC) that are added to the cooling tower water circuit to prevent corrosion, mineral scaling, and biofouling and can damage physicochemical desalination equipment. The potential of constructed wetlands (CWs) for the cost-effective removal of these CC prior to desalination is discussed in this review. The characteristics of CWs that determine their suitability for the removal of CC from cooling tower blowdown are elucidated, such as multiple removal pathways working simultaneously. In addition, specific challenges for the design of a constructed wetland for cooling tower blowdown treatment are reviewed, such as configuration options, the toxicity of CC, and the formation and removal of harmful byproducts.

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“…Therefore, there is a need for the development of visible light responsive photocatalyst. Recently many efforts have been taken to improve the visible light active photocatalytic properties of TiO 2 such as by doping with metals [10][11][12][13][14] and nonmetals [15][16][17][18], deposition of noble metals [19][20][21], surface fluorination [22] and controlling crystal facets [23], by creating heterojunction by coupling with other semiconductor materials having suitable band gap [24][25][26][27][28]. Design of nano structures having different morphologies like nanoflower [29], nanofibers [30], nanorod [31], coupling with carbanious materials like grapheme [32], carbon nanotube [33], and development of porous nanostructures [19] have also been proposed to increase visible light absorbance and to reduce the electron-hole pair recombination rate of TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

In-situ synthesis of mixed phase electrospun TiO2 nanofibers: a novel visible light photocatalyst

et al. 2019

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TiO 2 nanofibers were synthesized by electrospinning method using mixed titanum isopropoxide and polyvinylpyrrolidone precursors in ethanol followed by calcination at high temperature. The obtained TiO 2 e-spun nanofibers were characterized by FESEM, TEM, XRD, XPS and BET surface area analytical techniques. XRD result shows that the nanofibers contain both anatase and rutile mixed phases. FESEM and TEM study indicates the development of precise fine tiny nanoparticles with diameter in the range of 10-20 nm, which are oriented along one dimensional direction to form the fibrous structure with diameter in the range of 300-500 nm. The mixed phase TiO 2 nanofibers were used as photocatalysts for degradation of Rhodamine-B and Methyl orange under solar light irradiation and also under visible light irradiation. More than 99% degradation was achieved within 90 min of irradiation time for both the dyes. Furthermore, it is observed that the TiO 2 photocatalyst is efficiently degrading (98%) the tetracycline hydrochloride solution within 70 min of contact time. The excellent visible light photocatalytic activity may be attributed to the combine factors of hetero-conjunction at anatase-rutile interface and immediate charge transfer due to 1D structure, which inhibit the electron-hole recombination. Graphical abstract Rutile-Anatase dual phase TiO2 nanofibers exhibit excellent visible light photocatalytic activity due to the combine factors of hetero-conjunction at anatase-rutile interface and immediate charge transfer due to 1D structure, which inhibits the electron-hole recombination.

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Boron doped TiO2 catalysts for photocatalytic ozonation of aqueous mixtures of common pesticides: Diuron, o-phenylphenol, MCPA and terbuthylazine

Cited by 118 publications

References 36 publications

Terbuthylazine and desethylterbuthylazine: Recent occurrence, mobility and removal techniques

Terbuthylazine and desethylterbuthylazine: Recent occurrence, mobility and removal techniques

A review on the removal of conditioning chemicals from cooling tower water in constructed wetlands

In-situ synthesis of mixed phase electrospun TiO2 nanofibers: a novel visible light photocatalyst

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