Photocatalytic degradation of oxytetracycline using TiO2 under natural and simulated solar radiation

Pereira, João; Vilar, Vítor J.P.; Borges, Maria Teresa Mendes Ribeiro; González, Óscar Clavería; Esplugas, Santiago; Boaventura, Rui A.R.

doi:10.1016/j.solener.2011.08.012

Cited by 157 publications

(59 citation statements)

References 34 publications

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“…The photocatalytic degradation of oxytetracycline was also reported to be removed in solution without pH modification. [52] The change in pH was monitored throughout the course of the irradiation reaction. The pH values after 2 h of irradiation changed to pH , 4 for the acidic and neutral conditions tested, whereas for the basic conditions a pH , 6 was recorded.…”

Section: Table 4 Pseudo-first-order Rate Constants (K) For the Variomentioning

confidence: 99%

Photolysis and TiO2-catalysed degradation of diclofenac in surface and drinking water using circulating batch photoreactors

Kanakaraju¹,

Cherie²,

Motti³

et al. 2014

Environ. Chem.

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Environmental context. Diclofenac, a common non-steroidal anti-inflammatory drug, is not completely removed from surface and drinking water by conventional treatment methods. Consequently, this drug is present in the aquatic environment and has been subsequently linked to toxic effects on organisms. We show that photolysis and TiO 2 -catalysed degradation in circulating batch reactors efficiently results in diclofenac removal under a variety of conditions. These photochemical methods thus may lead to more effective water treatment processes.Abstract. The occurrence of diclofenac (DCF) as an emerging pollutant in surface waters and drinking water has been attributed to elevated global consumption and the inability of sewage treatment plants to remove DCF. In this study, DCF spiked drinking water and river water was subjected to photolysis and TiO 2 photocatalytic treatments in a circulating laboratory-scale (immersion-well) and a demonstration-scale loop reactor (Laboclean). The operational parameters for the immersion-well reactor were optimised as follows: TiO 2 P25 loading, 0.1 g L À1 ; natural pH, 6.2; initial concentration, 30 mg L À1 ; water type, distilled water. Complete DCF removal was realised within 15 min under the optimised conditions using the immersion-well reactor. Sunlight-mediated photochemical degradation required a prolonged exposure period of up to 360 min for complete DCF removal. DCF in distilled and drinking water was efficiently degraded in the larger Laboclean reactor. Differences were, however, observed based on their pseudo-first-order rate constants, which implies that the water matrix has an effect on the degradation rate. Six major photoproducts, 2-(8-chloro-9H-carbazol-1-yl)acetic acid, 2-(8-hydroxy-9H-carbazol-1-yl)acetic acid, 2,6-dichloro-N-o-tolylbenzenamine, 2-(phenylamino)benzaldehyde, 1-chloromethyl-9H-carbazole and 1-methyl-9H-carbazole, generated from TiO 2 photocatalysis of DCF were identified by liquid chromatography-mass spectrometry (LCMS) and Fourier transform-ion cyclotron resonance-mass spectrometry (FT-ICR-MS). This work has shown that photocatalytic degradation kinetics of DCF are dependent on both the geometry of the photoreactor and the nature of the water matrices.

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Section: Table 4 Pseudo-first-order Rate Constants (K) For the Variomentioning

confidence: 99%

Photolysis and TiO2-catalysed degradation of diclofenac in surface and drinking water using circulating batch photoreactors

Kanakaraju¹,

Cherie²,

Motti³

et al. 2014

Environ. Chem.

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“…Conventional sewage treatment technologies are ineffective in the removal of such pollutants present at trace levels [1][2][3][4], demonstrating an urgent need for innovative technologies that can effectively deal with these compounds [5][6][7]. Photocatalysis is an alternative since it allows their rapid and efficient removal from water, transforming them into by-products with lower toxicity [5,6].…”

Section: Introductionmentioning

confidence: 99%

Orthogonal experimental design of titanium dioxide—Poly(methyl methacrylate) electrospun nanocomposite membranes for photocatalytic applications

Vild

Teixeira

Kühn

et al. 2016

Journal of Environmental Chemical Engineering

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“…In a previous work it was reported the effect of solar and simulated solar photolysis on OTC degradation [33], which can be expected from the relative overlapping of the UV absorbance spectrum of OTC with both solar and xenon lamp spectra, as seen in Fig. 1c.…”

Section: Conventional Fe 2+ /H2o2/uv-vis Reactionmentioning

confidence: 63%

Process enhancement at near neutral pH of a homogeneous photo-Fenton reaction using ferricarboxylate complexes: Application to oxytetracycline degradation

Pereira

Queirós

Reis

et al. 2014

Chemical Engineering Journal

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This work demonstrates the application at near neutral pH of a photo-Fenton reaction mediated by ferri-carboxylates on the treatment of aqueous solutions containing the antibiotic Oxytetracycline (OTC) under solar irradiation. The formation of a Fe:OTC complex after Fe 2+ oxidation to Fe 3+ , in the presence of H2O2, showed the inconvenience of using the conventional Fe 2+ /H2O2/UV-Vis process at near neutral pH levels, as the complex is retained in the filter. To overcome this, a Fe 3+ /Oxalate/UV-Vis or Fe 3+ /Citrate/H2O2/ UV-Vis process was proposed. The higher tendency of Fe 3+ to form complexes with carboxylates avoids the formation of Fe:OTC complexes and allows for proper OTC detection along reaction times. The photo-Fenton process itself is improved by the extension of the iron solubility to higher and more practical pH values, by the increase of the quantum yield of Fe 2+ production and by presenting stronger radiation absorption at wavelengths up to 580 nm. In this way, process efficiency 2 was evaluated for different variables such as Fe 3+ concentration, pH, temperature and irradiance, using a compound parabolic collector (CPC) photoreactor at lab-scale under simulated solar radiation. Reaction rates were compared in the presence of different inorganic anions and humic acids, and in two different real wastewater matrixes. Results obtained in a CPC pilot-scale plant under natural solar light, using an iron/oxalate molar ratio of 1:3 ([Fe 3+ ]=2 mg L -1 , the maximum allowable discharge limit imposed by Portuguese regulations), at an initial pH of 5.0, showed that the antibiotic is quickly removed from solution, with consequent loss of activity on Escherichia coli (DSM 1103). The original DOC was decreased by 51%, with a remaining high percentage of low-molecular-weight carboxylate anions, and the final pH is within the legal discharge limits.

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Photocatalytic degradation of oxytetracycline using TiO2 under natural and simulated solar radiation

Cited by 157 publications

References 34 publications

Photolysis and TiO2-catalysed degradation of diclofenac in surface and drinking water using circulating batch photoreactors

Photolysis and TiO2-catalysed degradation of diclofenac in surface and drinking water using circulating batch photoreactors

Orthogonal experimental design of titanium dioxide—Poly(methyl methacrylate) electrospun nanocomposite membranes for photocatalytic applications

Process enhancement at near neutral pH of a homogeneous photo-Fenton reaction using ferricarboxylate complexes: Application to oxytetracycline degradation

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