Solar photocatalitycal treatment of carbofuran at lab and pilot scale: Effect of classical parameters, evaluation of the toxicity and analysis of organic by-products

Lopez-Alvarez, Blady; Torres-Palma, Ricardo A.; Peñuela, Gustavo A.

doi:10.1016/j.jhazmat.2011.04.060

Cited by 68 publications

(37 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The · OH-initiated photocatalytic oxidation of quinolones [21], i.e., flumequine and nalidixic acid, using NTO under solar light passed through fourteen stable intermediates that were identified using liquid chromatography-time of flight-mass spectrometry. In another example, five hydroxylated intermediates (Scheme 1a) were identified in the degradation of a pesticide, carbofuran [22]. The role of · OH in the initiation of this photocatalytic degradation was confirmed by the knowledge of carbofuran adsorption on P25 catalyst and by conduction of the experiments using a non-aqueous solvent, acetonitrile.…”

Section: Mechanism and Kineticsmentioning

confidence: 86%

“…Photocatalytic degradation pathways of (a) carbofuran and (b) lamivudine (Reproduced from [22] and [25] respectively, copyright (2011), with permission from Elsevier).…”

Section: Methodsmentioning

confidence: 99%

“…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%

“…The absence of adsorption eliminates the possibility of the direct oxidation of carbofuran by surface-generated holes [22], which is considered to be a minor secondary reaction in NTO photocatalytic degradation [25,26] on TiO 2 catalysts under UV illumination. When this experiment was conducted in the non-aqueous solvent, acetonitrile, total inhibition of carbofuran degradation was observed [22], due to the low production of · OH in acetonitrile. These findings show that the photocatalytic degradation of aqueous pollutants is initiated mainly by · OH attack.…”

Section: Mechanism and Kineticsmentioning

confidence: 99%

See 3 more Smart Citations

Photocatalytic Water Treatment by Titanium Dioxide: Recent Updates

Varghese²,

2012

View full text Add to dashboard Cite

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.

show abstract

Section: Mechanism and Kineticsmentioning

confidence: 86%

“…Photocatalytic degradation pathways of (a) carbofuran and (b) lamivudine (Reproduced from [22] and [25] respectively, copyright (2011), with permission from Elsevier).…”

Section: Methodsmentioning

confidence: 99%

Section: Mechanism and Kineticsmentioning

confidence: 99%

Section: Mechanism and Kineticsmentioning

confidence: 99%

See 2 more Smart Citations

Photocatalytic Water Treatment by Titanium Dioxide: Recent Updates

Varghese²,

2012

View full text Add to dashboard Cite

show abstract

“…Effects of water characteristics 3.1.1. Effect of the initial pH Solution pH can entail into structural modifications of organic compounds, the catalyst properties and the oxidative species formed leading to important changes during organic pollutant degradation (Hazime et al, 2012;Ince et al, 2009;Lopez-Alvarez et al, 2011). Consequently, toward a better selection of the AOP, it is crucial to evaluate the influence of initial pH.…”

Section: Resultsmentioning

confidence: 99%

Selecting the best AOP for isoxazolyl penicillins degradation as a function of water characteristics: Effects of pH, chemical nature of additives and pollutant concentration

Villegas-Guzmán

Silva-Agredo

Flórez

et al. 2017

Journal of Environmental Management

Self Cite

View full text Add to dashboard Cite

a b s t r a c tTo provide new insights toward the selection of the most suitable AOP for isoxazolyl penicillins elimination, the degradation of dicloxacillin, a isoxazolyl penicillin model, was studied using different advanced oxidation processes (AOPs): ultrasound (US), photo-Fenton (UV/H 2 O 2 /Fe 2þ ) and TiO 2 photocatalysis (UV/TiO 2 ). Although all processes achieved total removal of the antibiotic and antimicrobial activity, and increased the biodegradability level of the solutions, significant differences concerning the mineralization extend, the pH of the solution, the pollutant concentration and the chemical nature of additives were found. UV/TiO 2 reached almost complete mineralization; while~10% mineralization was obtained for UV/H 2 O 2 /Fe 2þ and practically zero for US. Effect of initial pH, mineral natural water and the presence of organic (glucose, 2-propanol and oxalic acid) were then investigated. UV/H 2 O 2 /Fe 2þ and US processes were improved in acidic media, while natural pH favored UV/TiO 2 system. According to both the nature of the added organic compound and the process, inhibition, no effect or enhancement of the degradation rate was observed. The degradation in natural mineral water showed contrasting results according to the antibiotic concentration: US process was enhanced at low concentration of dicloxacillin followed by detrimental effects at high substrate concentrations. A contrary effect was observed during photo-Fenton, while UV/TiO 2 was inhibited in all of cases. Finally, a schema illustrating the enhancement or inhibiting effects of water matrix is proposed as a tool for selecting the best process for isoxazolyl penicillins degradation.

show abstract

Specific Methods for the Destruction of Hazardous Chemicals in the Laboratory

2023

Destruction of Hazardous Chemicals in the Laboratory

View full text Add to dashboard Cite

Solar photocatalitycal treatment of carbofuran at lab and pilot scale: Effect of classical parameters, evaluation of the toxicity and analysis of organic by-products

Cited by 68 publications

References 34 publications

Photocatalytic Water Treatment by Titanium Dioxide: Recent Updates

Photocatalytic Water Treatment by Titanium Dioxide: Recent Updates

Selecting the best AOP for isoxazolyl penicillins degradation as a function of water characteristics: Effects of pH, chemical nature of additives and pollutant concentration

Specific Methods for the Destruction of Hazardous Chemicals in the Laboratory

Contact Info

Product

Resources

About