Simultaneous degradation of the pharmaceuticals gemfibrozil, hydrochlorothiazide and naproxen and toxicity changes during UV-C and UV-C/H2O2 processes in different aqueous matrixes

Paniagua, Cleiseano E.S.; Ricardo, Ivo A.; Marson, Eduardo O.; Gonçalves, Bárbara R.; Trovó, Alam G.

doi:10.1016/j.jece.2019.103164

Cited by 21 publications

(14 citation statements)

References 45 publications

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“…Gemfibrozil solutions have been treated by conventional Fenton [54] and photo-Fenton [55] at pH 5.0, as well as by UVC and UVC/H2O2 [56]. Regarding the electrochemical AOPs, uniquely the performance of electro-peroxone [57] and electro-oxidation with electrogenerated H2O2…”

Section: Introductionmentioning

confidence: 99%

Magnetic MIL(Fe)-type MOF-derived N-doped nano-ZVI@C rods as heterogeneous catalyst for the electro-Fenton degradation of gemfibrozil in a complex aqueous matrix

Padilla

Xuriguera

et al. 2020

Applied Catalysis B: Environmental

176

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Section: Introductionmentioning

confidence: 99%

Magnetic MIL(Fe)-type MOF-derived N-doped nano-ZVI@C rods as heterogeneous catalyst for the electro-Fenton degradation of gemfibrozil in a complex aqueous matrix

Padilla

Xuriguera

et al. 2020

Applied Catalysis B: Environmental

176

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“…The concentrations of H 2 O 2 for each matrix were chosen based on a previous work of our group. 8 Using the ideal conditions (150 mg L −1 of TiO 2 and 6 mg L −1 of H 2 O 2 for DW and SW and only 450 mg L −1 of TiO 2 for STP 1 effluent), the irradiation time was doubled from 120 to 240 min for the DW and SW, and from 240 to 360 min for the STP effluent while monitoring the evolution of toxicity as well as mineralization.…”

Section: Photolytic and Photocatalytic Experimentsmentioning

confidence: 99%

“…Although present at low concentrations, they cause deleterious effects to aquatic biota. 7 A previous study of our research group 8 showed that the degradation of these pharmaceuticals by UV-C and UV-C/H 2 O 2 processes was strongly affected by the matrix composition. These results have motivated the evaluation of the degradation of these target compounds by heterogeneous photocatalysis, since this process has the advantage that sunlight can be used as a source of radiation, and the process has applications over a wide pH range.…”

Section: Introductionmentioning

confidence: 99%

“…These results have motivated the evaluation of the degradation of these target compounds by heterogeneous photocatalysis, since this process has the advantage that sunlight can be used as a source of radiation, and the process has applications over a wide pH range. 9 Alvarez-Corena et al 10 evaluated the influence of pH (3)(4)(5)(6)(7)(8)(9) and TiO 2 dosage (0.1-2.5 g L −1 ) by TiO 2 /UV-C during the simultaneous degradation of five contaminants including gemfibrozil in deionized water (DW) (initially with 2 mg L −1 for each compound). Optimal results were obtained with 1.5 g L −1 of the photocatalyst and at pH 5.0.…”

Section: Introductionmentioning

confidence: 99%

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Matrix Effects on the Degradation of Gemfibrozil, Hydrochlorothiazide, and Naproxen by Heterogeneous Photocatalysis

Paniagua¹,

Marson²,

Ricardo³

et al. 2020

J. Braz. Chem. Soc.

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The degradation of a pharmaceutical mixture (gemfibrozil, hydrochlorothiazide and naproxen) by TiO 2 /UV-A in different aqueous matrices was evaluated. The matrix components affected the operational conditions, rate constants, and removal efficiency of the pharmaceuticals, as well as toxicity. For sewage treatment plant effluent, a TiO 2 concentration threefold higher (450 mg L −1) and an irradiation time 1.5-3 times longer were required to reach the same efficiency of degradation as the pharmaceuticals in deionized water and surface water matrices. An improvement in the rate constants and the removal efficiency of the pharmaceuticals was achieved by adding 6 mg L −1 of H 2 O 2 and 150 mg L −1 of TiO 2 in deionized water and surface water, but not in the sewage treatment plant effluent, due to the coupling of 450 mg L −1 of TiO 2 and 50-200 mg L −1 of H 2 O 2. Overall, TiO 2 /UV-A efficiently degraded all compounds, but an additional step is needed for the removal of residual toxicity.

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“…Advanced oxidative processes (AOPs) [1][2][3][4][5] are suitable for attaining effective oxidation of HCT. Among the AOPs currently tested for oxidizing HCT, it is found processes like UV-H2O2 [6,7], UV/K2S2O8 [7], ozonation [8][9][10], photo-(electro)catalytic oxidation [11], electro-oxidation [12] and also the unusual H2O2 chemical oxidation in subcritical water [13]. All of them are capable to fully degrade HCT but rarely mineralize it.…”

Section: Introductionmentioning

confidence: 99%

Stoichiometric Excess of H2O2 as Strategy of Oxidant Dosing for Intensifying Both Degradation and Mineralization of the Hydrochlorothiazide via UVCH2O2, Dark-Fenton, and Photo-Fenton

Cunha-Filho¹,

Mota-Lima²,

Nascimento³

et al. 2020

Preprint

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<div>Hydrochlorothiazide (HCT) is a pharmaceutical micropollutant highly toxic to the environment, being strictly mandatory to oxidize it completely toward CO2. In this context, how could the HCT oxidation via advanced oxidative processes benefit from the accelerated oxidation rates promoted by the mineralization stoichiometric excess of H2O2 ? Overall, this work elucidates the role of stoichiometric H2O2 concentration on promoting fast degradation/mineralization rates across Advanced Oxidative Processes (AOP). Employing 0.68 excess of H2O2, it was found absolute (100%) HCT degradation within 60 minutes and 95% within 30 min for UVC-H2O2 oxidation; however, the mineralization of HCT suffered limited optimization even at high H2O2 excess, being at the best performance 26.76% HCT mineralized via UVC photo-Fenton within 60 min at initial 2.00 H2O2 excess. Very presumably, the evaporation of H2O2 was the underlying reason for a low mineralization performance. Together with a detailed mathematical methodology, the time-synchronized evolution of both the residual H2O2 concentration and the TOC depletion were employed to infer the quantity of radical ∙OH that effectively was consumed by the micropollutant mineralization. The global mean efficiency of radicals •OH consumption by the HCT mineralization laid around 15% for UVC Fenton considering H2O2 excess of 2.00. Under these conditions, the residual H2O2 concentration depletes significantly within 30 minutes of UVC photo-Fenton oxidation, which indicates that either the solution heating or stirring is very likely to promote a substantial loss of H2O2 by evaporation in the beaker-assembled reactor<br></div>

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Simultaneous degradation of the pharmaceuticals gemfibrozil, hydrochlorothiazide and naproxen and toxicity changes during UV-C and UV-C/H2O2 processes in different aqueous matrixes

Cited by 21 publications

References 45 publications

Magnetic MIL(Fe)-type MOF-derived N-doped nano-ZVI@C rods as heterogeneous catalyst for the electro-Fenton degradation of gemfibrozil in a complex aqueous matrix

Magnetic MIL(Fe)-type MOF-derived N-doped nano-ZVI@C rods as heterogeneous catalyst for the electro-Fenton degradation of gemfibrozil in a complex aqueous matrix

Matrix Effects on the Degradation of Gemfibrozil, Hydrochlorothiazide, and Naproxen by Heterogeneous Photocatalysis

Stoichiometric Excess of H2O2 as Strategy of Oxidant Dosing for Intensifying Both Degradation and Mineralization of the Hydrochlorothiazide via UVCH2O2, Dark-Fenton, and Photo-Fenton

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