On the kinetics and mechanisms of photolytic/TiO2-photocatalytic degradation of substituted pyridines in aqueous solutions

Stapleton, David R.; Konstantinou, Ioannis; Mantzavinos, Dionissios; Hela, Dimitra; Papadaki, Maria

doi:10.1016/j.apcatb.2009.12.015

Cited by 54 publications

(22 citation statements)

References 45 publications

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“…2-HPY (P 1 ), is directly produced from 2-CPY and it is subsequently forming Dewar pyridinone (product P 2 ) as in the case of other 2-halogenated pyridines while a small amount of 2-CPY reacts directly to form Dewar pyridinone [2]. Products P 2 (5-azabicyclo[2.2.0]hex-2-en-6-one), P 3 (1H-pyrrole-2-carboxaldehyde), P 4 (6-hydroxy-2(1H)-pyridinone), P 5 (N-formyl-3-carbamoylpropenal) and P 11 (2-pyridinecarbonitrile) have been also identified in the degradation of other 2-halogenated pyridines [2], while products P 5 and P 9 (6-chloro-2-pyridinecarboxylic acid) were also found to form during 2-CPY photocatalysis [32]. Moreover, products P 5 and P 11 were also identified during 2-fluoropyridine photocatalysis [32].…”

Section: Photolytic Treatment Of 2-cpymentioning

confidence: 94%

Genotoxicity study of photolytically treated 2-chloropyridine aqueous solutions

Vlastos

Skoutelis

Theodoridis

et al. 2010

Journal of Hazardous Materials

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Section: Photolytic Treatment Of 2-cpymentioning

confidence: 94%

Genotoxicity study of photolytically treated 2-chloropyridine aqueous solutions

Vlastos

Skoutelis

Theodoridis

et al. 2010

Journal of Hazardous Materials

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“…Photocatalytic destruction of pollutants in aqueous solutions using NTO is facilitated mainly by a series of hydroxylation reactions initiated by hydroxyl radicals (· OH) [20][21][22][23][24][25][26]. Possible modes of · OH generation during NTO photocatalysis are shown in Figure 2.…”

Section: Mechanism and Kineticsmentioning

confidence: 99%

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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“…Pyridine and pyridine derivatives have received wide attention because of their occurrence in the environment and their hazardous effects on ecosystems and human health [4]. Picloram (4-amino-3,5,6-trichloro-2-pyridincarboxylic acid) is a potent herbicide that effectively controls the growth of broadleaf weed in pasture and rangeland, as well as in fields cultivated for wheat, barley, oats and woody plant species [5].…”

Section: Introductionmentioning

confidence: 99%