Photodegradation of the pharmaceuticals amoxicillin, bezafibrate and paracetamol by the photo-Fenton process—Application to sewage treatment plant effluent

Trovó, Alam G.; Melo, Silene Alessandra Santos; Nogueira, Raquel Fernandes Pupo

doi:10.1016/j.jphotochem.2008.03.011

Cited by 195 publications

(76 citation statements)

References 28 publications

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“…The photodegradation experiments were carried out in Araraquara, Brazil (22°S 48°W), using a solar reactor composed of a 49.5 cm long glass tube with an internal diameter of 3.6 cm, previously described by Trovó et al 14 The experiments were performed during winter, between 10 am and 2 pm.…”

Section: Photodegradation Proceduresmentioning

confidence: 99%

“…12 The application of advanced oxidation processes (AOPs), based on the generation of highly oxidizing hydroxyl radicals ( · OH), can be a good alternative, due to their simplicity and the possibility of using sunlight, as in the photo-Fenton process and heterogeneous photocatalysis, which reduces energy costs. [13][14][15] Reports of the direct photolysis of DCF in lake and pure water under sunlight and UV irradiation, as well as its degradation using different oxidation processes such as H 2 O 2 /UV and ozonation, are indicative of significant dechlorination and mineralization. [16][17][18][19] Degradation using the photo-Fenton process has been demonstrated to be more efficient than heterogeneous photocatalysis, achieving total oxidation of DCF in half the time.…”

Section: Introductionmentioning

confidence: 99%

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Diclofenac abatement using modified solar photo-fenton process with ammonium iron(III) citrate

Trovó¹,

Nogueira²

2011

J. Braz. Chem. Soc.

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A influência do pH na degradação do fármaco diclofenaco (DCF) por processo foto-Fenton/ solar foi avaliada usando o complexo citrato de amônio e ferro(III) (FecitNH 4 ). Embora a eficiência de degradação diminua com o aumento do pH (no intervalo de pH de 5 a 8), a concentração de DCF ficou abaixo do limite de detecção após 45 min de irradiação enquanto que 77% do carbono orgânico total foi removido após 150 min em pH 7 (sem ajuste posterior). Foi verificada cinética de primeira ordem para a degradação de DCF, cuja constante de velocidade aumentou com o aumento das concentrações de FecitNH 4 e H 2 O 2 . Menor degradação de DCF foi observada quando presente na matriz efluente de estação de tratamento de esgoto (ETE), devido principalmente à alta concentração de carbonato e bicarbonato em pH 7. Entretanto, após ajuste de pH para 5, a concentração de DCF ficou abaixo do limite de detecção após 75 min de irradiação.The influence of pH on the degradation of the pharmaceutical diclofenac (DCF) by the solar/ photo-Fenton process was investigated using ammonium iron(III) citrate complex (FecitNH 4 ). Although the degradation efficiency decreased as the pH increased (in the pH range 5 to 8), the DCF concentration was lower than its limit of detection after 45 min irradiation while 77% of the total organic carbon was removed after 150 min irradiation at initial pH 7 (without further adjustment). A pseudo-first-order kinetics of DCF degradation was observed, which kinetic constant increased with the increase of the concentrations of FecitNH 4 and H 2 O 2 . Lower DCF degradation was observed when present in a sewage treatment plant (STP) effluent sample, mainly due to the high concentration of carbonate and bicarbonate at pH 7. However, after adjusting the pH to 5, the DCF concentration was lower than its detection limit after 75 min irradiation.

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Section: Photodegradation Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Diclofenac abatement using modified solar photo-fenton process with ammonium iron(III) citrate

Trovó¹,

Nogueira²

2011

J. Braz. Chem. Soc.

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“…Several studies have been conducted to find an effective method of acetaminophen degradation in aqueous solutions. Among then can be mentioned chemical [7,8], electrochemical [9][10][11], sonolysis [12], Fenton [13], photo-Fenton [14][15][16][17][18], solar/TiO 2 and solar/photo-Fenton [19], solar-photoelectro-Fenton [20], ozonation and H 2 O 2 /UV oxidation [21], ozonation catalyzed with photo-Fenton [18], TiO 2 photocatalysis [22][23][24][25], and electrocatalysis [26]. In these studies, partial degradation of acetaminophen was achieved, from 14% [15] to 88% [13], rather than a total mineralization.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Acetaminophen and Its Transformation Products in Aqueous Solutions by Using an Electrochemical Oxidation Cell with Stainless Steel Electrodes

Zavala

Estrada

2016

Water

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Abstract:In this study, a novel electrochemical oxidation cell using stainless steel electrodes was found to be effective in oxidizing acetaminophen and its transformation products in short reaction times. Aqueous solutions of 10 mg/L-acetaminophen were prepared at pH 3, 5, 7, and 9. These solutions were electrochemically treated at direct current (DC) densities of 5.7 mA/cm 2 , 7.6 mA/cm 2 , and 9.5 mA/cm 2 . The pharmaceutical and its intermediates/oxidation products were determined by using high pressure liquid chromatography (HPLC). The results showed that electrochemical oxidation processes occurred in the cell. Acetaminophen degradation rate constants increased proportionally with the increase of current intensity. High current densities accelerated the degradation of acetaminophen; however, this effect diminished remarkably at pH values greater than 5. At pH 3 and 9.5 mA/cm 2 , the fastest degradation of acetaminophen and its intermediates/oxidation products was achieved. To minimize the wear down of the electrodes, a current density ramp is recommended, first applying 9.5 mA/cm 2 during 2.5 min or 7.6 mA/cm 2 during 7.5 min and then continuing the electrochemical oxidation process at 5.7 mA/cm 2 . This strategy will hasten the acetaminophen oxidation, extend the electrode's life, and shorten the reaction time needed to degrade the pharmaceutical and its intermediates/oxidation products. DC densities up to 9.5 mA/cm 2 can be supplied by photovoltaic cells.

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“…It has been found in European Sewage Treatment Plants in concentrations around 6 µg L -1 (Ternes 1998) and several studies have demonstrated AOPs capability to degrade PCT from different matrixes, more specifically, ozonation (Andreozzi et al 2003), radiolysis (Szabó et al 2003), photolysis and UV/H 2 O 2 (Kim et al 2009), heterogeneous photocatalysis (Yang et al 2008) and Fenton and related process (Trovó et al 2008;Santos-Juanes et al 2011a and2011b;Durán et al 2011;De Luna et al 2012;Li et al 2012) have been used to degrade this EC at a wide range of concentrations (from 1x10 -6 to 25 mM). These investigations have confirmed that sole UV irradiation above 254 nm does not degrade PCT or mineralize samples, but the presence of H 2 O 2 may lead to total degradation and partial mineralization of the samples (Kim et al 2009;Trovó et al 2008;Yang et al 2008). …”

Section: Introductionmentioning

confidence: 99%

Photonic efficiency of the photodegradation of paracetamol in water by the photo-Fenton process

Yamal-Turbay

Ortega

Conte

et al. 2014

Environ Sci Pollut Res

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Photodegradation of the pharmaceuticals amoxicillin, bezafibrate and paracetamol by the photo-Fenton process—Application to sewage treatment plant effluent

Cited by 195 publications

References 28 publications

Diclofenac abatement using modified solar photo-fenton process with ammonium iron(III) citrate

Diclofenac abatement using modified solar photo-fenton process with ammonium iron(III) citrate

Degradation of Acetaminophen and Its Transformation Products in Aqueous Solutions by Using an Electrochemical Oxidation Cell with Stainless Steel Electrodes

Photonic efficiency of the photodegradation of paracetamol in water by the photo-Fenton process

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