Photodegradation of non-ionic surfactant with different ethoxy groups in aqueous effluents by the photo-Fenton process

Silva, Syllos S. da; Chiavone‐Filho, Osvaldo; Neto, Eduardo Lins de Barros; Mota, André Luís Novais; Foletto, Edson Luiz; Nascimento, Cláudio Augusto Oller do

doi:10.1080/09593330.2013.873485

Cited by 12 publications

(4 citation statements)

References 32 publications

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“…In the Prof. Chiavone-Filho and Prof. Nascimento research groups, several homogenous photo-chemical reactors [23][24][25][26] have been tested over the years, and for none of the cases, the stoichiometric excess of H2O2 was pointed out categorially. Even though dating back to the outstanding fast mineralization earliest obtained by Silva et al [23], the signals of the role played by the H2O2 excess were hidden there, but the H2O2 excess had remained unnoted by Silva et al…”

Section: Discussionmentioning

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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Section: Discussionmentioning

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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“…With a high production value estimated over 18 million tons [80], their wide use generates the disposal of large amounts of these compounds in WWTPs or improperly directly into the aquatic environment without any kind of treatment. Their amphoteric character allows them to be accumulated in sediments, sludge and biota, generating concern about the potential related hazard to the environment [81].…”

Section: Surfactantsmentioning

confidence: 99%

Introduction: Personal Care Products in the Aquatic Environment

Molins-Delgado

Díaz˗Cruz

Barceló

2014

The Handbook of Environmental Chemistry

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This chapter presents an overview of the main aspects relating to the occurrence and impact of ingredients in personal care products to the aquatic environment: methodologies of analysis, prevalence data, elimination processes, threats to the aquatic ecosystem, effects on biota and legislation with a special focus in European regulation. Water is a valuable resource for the environment as well as for human activities. Although it covers most of the Earth's surface, the amount of usable water is finite. Since ancient times until now, the use of water in human activities has been rapidly increasing along with the increase of the population, producing a continuous release of pollutants into the aquatic environment. Personal care products are a widely used group of substances that have been raising concerns during the last decades due to its continuous release into the environment and its proven effects (mostly on in vitro and in vivo assays) as a threat to all kinds of living organisms. Recent studies suggest that its continuous application on the skin or the intake of contaminated food may cause some concerning hazardous effects in human beings. In order to ensure the protection of this key ecosystem, a series of worldwide initiatives have been taking place during the last two decades, impelling monitoring programmes and governmental regulations worldwide. The common grounds of the European Union establish a series of regulations, such as the Water

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“…Not surprisingly, the oxidant concentration has been the most controversial parameter with regard to the extent of mineralization. To illustrate the problem, we recall that sometimes the hydrogen peroxide (H2O2) is suggested to be added in a continuous flow, (da Silva et al, 2014;Esteves et al, 2019a;Moraes et al, 2004;Vilar et al, 2020) that means the overall oxidant content is fragmented over time into several doses of small quantities (Esteves et al, 2019b;Mota et al, 2018) , or even suggested to be added all at once in the treatment onset (Cunha-Filho et al, 2020) . What would be the most costeffective dosing program of the precursor oxidant, namely the H2O2?…”

Section: Time-resolved Analysis Of the Radiation Dose Commensurate Wi...mentioning

confidence: 99%

Efficiency of the H2O2 consumption by the mineralization of hydrochlorothiazide via photo-Fenton UVA: a time dependent analysis

Mota-Lima

Cunha-Filho²,

Chiavone‐Filho³

et al. 2022

Braz. J. Chem. Eng.

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In the photo-chemical conversion of hydrogen peroxide (H2O2) into radical ⦁OH, the impact of radiation dose (the quantum yield) on the oxidation kinetics has been properly reported, whereas the H2O2 dose is mostly treated as an attempt-and-error variable. This present work formally analyses the oxidant dose in terms of the efficiency of ⦁OH consumption by the micropollutant mineralization, which ultimately enables a generalist strategy for more cost-effective dosimetry of the oxidant. The experimental timedependent measure of two reagents (pollutant and oxidant) and one product (CO2) enables assessment to the micro-kinetics from the perspective of the chemical dynamic. The analysis was demonstrated for photo-Fenton (FP) oxidation of hydrochlorothiazide (HCT) using a tubular photo-reactor and UVA radiation. The average value of ~ 38% was on top of the best efficiencies in association with some of the fastest rates of mineralization. Such efficiencies are demonstrated to depend on the stochiometric concentration of the oxidant. Here, the variable stoichiometric H2O2 excess for mineralization is proposed as a universal metric to quantify the (under-) over-dose of H2O2. Overall, H2O2 excess between 2 and 5 leads to H2O2 consumption efficiencies above 30% together with a fast rate of CO2 formation (mineralization), whereas any value below 1 invariably leads to a sluggish oxidation rate, leading even to the full depletion of the oxidant. Aside from proposing a selection criterion for the most cost-effective H2O2dose and providing some examples, this work carefully analyzes the commitment of the H2O2 excess with respect to the energy costs (EEO).

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Photodegradation of non-ionic surfactant with different ethoxy groups in aqueous effluents by the photo-Fenton process

Cited by 12 publications

References 32 publications

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

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

Introduction: Personal Care Products in the Aquatic Environment

Efficiency of the H2O2 consumption by the mineralization of hydrochlorothiazide via photo-Fenton UVA: a time dependent analysis

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