Continuous treatment of an azo dye based on a combined ZVI/photo-Fenton setup. Process modelling by response surface methodology

Donadelli, Jorge A.; Berardozzi, Eliana; Carlos, Luciano; Einschlag, Fernando S. García

doi:10.1016/j.jwpe.2020.101480

Cited by 13 publications

(8 citation statements)

References 46 publications

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“…Artificial neural networks (ANN) have also been used as modeling alternatives together with the genetic algorithm for the optimization of several parameters such as H2O2 dosage, treatment time, and pH among others, allowing a prediction performance and validation of the optimal results through experimental data, confirming the reliability of this approach (Talwar et al 2019). The response surface methodology (RSM) has also had its contribution oriented to provide a simple model capable of quantitatively describing the system performance within the experimental domain studied, through an analysis of influential variables such as inlet pH, outlet pH, the hydraulic retention time (HRT) and the H2O2 dose concerning the response variable of the percentage decolorization of a dye, resulting in a simple polynomial equation capable of predicting color removal in a wide range of experimental conditions, and also showed that the pH of the reactor and the HRT are the key factors that influenced the system response (Donadelli et al 2020).…”

Section: +mentioning

confidence: 99%

Modelo estadístico de la descontaminación de aguas residuales que contienen Carbendazim mediante foto-Fenton

Becerra-Moreno,

Soto-Verjel,

Soto-Vergel

et al. 2024

Rev. U.D.C.A Act. & Div. Cient.

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Homogeneous photo-Fenton photocatalysis is one of the most widely used advanced oxidation processes in treating wastewater containing pesticides, where optimizing the catalyst dosage and oxidizing agent, with the response being mineralization in terms of total organic carbon (TOC) or removal of the specific contaminant, is the goal of any experimental design. Experimental development in treatment processes necessitates executing a significant number of experimental conditions that require the use of reagents, energy, and execution time. Therefore, modeling such phenomena emerges as an alternative to these limitations in wastewater treatment. In this research, the influence of factors FeSO4 and H2O2, each at three levels, on the mineralization of a synthetic solution of the insecticide Carbendazim (50 mg/L) in terms of TOC was evaluated using a multiple linear regression model optimized by response surface methodology. The main results established that the best model fit considers the interaction between FeSO4 and H2O2 (X1*X2) and the quadratic terms of each (X21,X22) with p-values < 0.05. The validation of the model using the Leave-One-Out Cross Validation (LOOCV) technique, as well as accuracy and precision through residual analysis and ordinary least squares assumptions, confirms the validity of the conclusions derived from it.

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Section: +mentioning

confidence: 99%

Modelo estadístico de la descontaminación de aguas residuales que contienen Carbendazim mediante foto-Fenton

Becerra-Moreno,

Soto-Verjel,

Soto-Vergel

et al. 2024

Rev. U.D.C.A Act. & Div. Cient.

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“…The 1/m value is directly proportional to the initial color removal rate of the dye. 1/b value; It expresses the maximum oxidation capacity at the end of the reaction ( 15): (15) The linear forms of Behnajady-Modirshahla-Ghanbery models are given in Eq. ( 16) [23,24]: (16)…”

Section: Kineticsmentioning

confidence: 99%

“…ZVI is a strong reducing agent as well as cheap and easy to produce. It has already been known as effective in removing organics as dye [14,15]. In the study of Minella et al, ZVI-Fenton was a suitable technique for the efficient degradation of ibuprofen and phenol under various operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Direct Blue 71 Degradation in the Presence of ZVI and H<sub>2</sub>O<sub>2</sub> Advanced Fenton Process: Determination of Optimum Conditions and Kinetics

Ertugay¹,

Acar²

2022

Pol. J. Environ. Stud.

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This study investigated color and COD removal of azo dye Direct Blue 71 (DB71) by a Fenton-like process in zero-valent iron (Fe 0 = ZVI). The UV-vis spectra of DB71 exhibit three main absorption bands -two in the UV region and one in the visible region. UV-vis spectra showed that the azo linkages in the molecule structure of the dyes were destroyed during the decolorization. The influence of various operational parameters such as pH, ZVI dosages, hydrogen peroxide (H 2 O 2 ) concentrations and temperature are studied to determine the optimum conditions for color and COD removal. pH is highly effective parameter of decolorization and COD destruction in this work. However, H 2 O 2 concentration and ZVI dosages were not only effective in the removal of COD for 100 mgL -1 initial DB71 concentration. Therefore, the optimum ZVI:H 2 O 2 ratio is based on determining the value of COD removal. Optimum conditions were accepted to be pH of 2.5, ZVI:H 2 O 2 ratio 4:1 and 20ºC temperature. The result indicated that 100% of decolorization efficiency was achieved within 20 min in the range of 150-400 mg/L initial DB71 concentrations by using optimal conditions. Residual COD values were 15.38, 22.35, 22.58, 27.04, 31.86 mg/L for 150, 200, 250, 300, 400 mg/L initial DB71 concentrations at the end of reaction time, respectively. Additionally, increasing the reaction temperature from 20 to 40ºC negatively affected the decolorization and degradation rate DB71. The experimental kinetic data are fitted very well the Behnajady-Modirshahla-Ghanbery model for color removal of DB71 dye.

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“…An appealing alternative for ZVI-based Fenton processes is splitting them into two individual steps, the first one with ZVI alone, followed by a second (photo)-Fenton step. The main advantages of this strategy could be enhancement of the parent pollutant reactivity by removing the groups that inhibit oxidation steps (i.e., dehalogenation) [17], less H 2 O 2 consumption and possible use in continuous mode, which can certainly facilitate the scaling up of the process [18]. In this regard, few works investigating this approach have been published.…”

Section: Introductionmentioning

confidence: 99%

A Rational Analysis on Key Parameters Ruling Zerovalent Iron-Based Treatment Trains: Towards the Separation of Reductive from Oxidative Phases

et al. 2021

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The development of treatment trains for pollutant degradation employing zerovalent iron has been attracting a lot of interest in the last few years. This approach consists of pre-treatment only with zerovalent iron, followed by a Fenton oxidation taking advantage of the iron ions released in the first step. In this work, the advantages/disadvantages of this strategy were studied employing commercial zerovalent iron microparticles (mZVI). The effect of the initial amount of mZVI, H2O2, pH, conductivity, anions and dissolved oxygen were analysed using p-nitrobenzoic acid (PNBA) as model pollutant. 83% reduction of PNBA 6 µM into p-aminobenzoic acid (PABA) was achieved in natural water at an initial pH 3.0 and 1.4 g/L of mZVI, under aerobic conditions, in 2 h. An evaluation of the convenience of removing mZVI after the reductive phase before the Fenton oxidation was investigated together with mZVI reusability. The Fenton step against the more reactive PABA required 50 mg/L of H2O2 to achieve more than 96% removal in 15 min at pH 7.5 (final pH from the reductive step). At least one complete reuse cycle (reduction/oxidation) was achieved with the separated mZVI. This approach might be interesting to treat wastewater containing pollutants initially resistant to hydroxyl radicals.

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Continuous treatment of an azo dye based on a combined ZVI/photo-Fenton setup. Process modelling by response surface methodology

Cited by 13 publications

References 46 publications

Modelo estadístico de la descontaminación de aguas residuales que contienen Carbendazim mediante foto-Fenton

Modelo estadístico de la descontaminación de aguas residuales que contienen Carbendazim mediante foto-Fenton

Direct Blue 71 Degradation in the Presence of ZVI and H<sub>2</sub>O<sub>2</sub> Advanced Fenton Process: Determination of Optimum Conditions and Kinetics

A Rational Analysis on Key Parameters Ruling Zerovalent Iron-Based Treatment Trains: Towards the Separation of Reductive from Oxidative Phases

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