Advanced Oxidative Degradation Processes: Fundamentals and Applications

Loures, Carla Cristina Almeida; Alcântara, Marco Aurélio Kondracki de; Filho, Hélcio José Izário; Teixeira, Antônio Carlos Silva Costa; Silva, Flávio T.; Paiva, Teresa Cristina Brazil de; Samanamud, Gisella Rossana Lamas

doi:10.15866/ireche.v5i2.6909

Cited by 44 publications

(43 citation statements)

References 71 publications

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“…The hydroxyl ion is very significant due to its high oxidation power and the reduction in environmental pollution caused by organic matter [21,22]. This method is applicable to the degradation of resistant compounds in comparison to other methods and, in view of its high oxidizing power; it converts them into mineral forms under special conditions [23]. In addition, recent advances on the removal of dyes using Fe-based metallic glasses/AOPs are also attractive [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Application of response surface methodology in the degradation of Reactive Blue 19 using H2O2/MgO nanoparticles advanced oxidation process

et al. 2018

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The release of dye containing effluent is a great threat to the world today. The purpose of this study is to optimize the removal of Reactive Blue 19 (RB19) dye from aqueous solutions using advanced oxidation process (AOP). Magnesium oxide nanoparticles (MgO NPs) and hydrogen peroxide (H 2 O 2 ) were used as the catalyst and oxidizer, respectively. Central composite design (CCD) based on response surface methodology (RSM) was applied for optimization of the AOP process. The effects of pH (3-7), molar H 2 O 2 /MgO NPs ratio (1-3), initial concentration of RB19 (20-80 mg/L), and contact time (30-90 min) were investigated on the oxidation process. The CCD was applied to determine the interactive effects of the process parameters and their optimum conditions. One-way analysis of variance (ANOVA) was applied for statistical data analysis. A quadratic model was generated by the CCD to represent the AOP on RB19 degradation. The experimental values obtained for percentage RB19 decolorization were found to be very close to the predicted response values. Based on the design, optimum conditions of pH 3, contact time of 60 min, RB19 concentration of 80 mg/L and H 2 O 2 /MgO NPs molar ratio of 3 were obtained which resulted in 93.77% RB19 removal. High value for the coefficient of determination, R 2 (0.912) and adjusted R 2 (0.805) showed that the removal of RB19 dye using AOP can be described by the RSM. The ANOVA results showed that the quadratic model developed from the RSM was statistically significant for RB19 decolorization. From the study, it could be concluded that the RSM can be a useful tool for optimization and moderation of the process parameters to maximize RB19 dye removal from aqueous solutions and the advanced H 2 O 2 /MgO NPs oxidation process.

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Section: Introductionmentioning

confidence: 99%

Application of response surface methodology in the degradation of Reactive Blue 19 using H2O2/MgO nanoparticles advanced oxidation process

et al. 2018

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“…Increasing chloride concentration deriving from gold precursor consumption can lead to the formation of various transition metal complexes absorbing in this region. In particular, at pH = 3.5 the most abundant complexes are FeOH 2+ , Fe(OH) 2 + and CrOH 2+ , Cr 3 (OH) 4 5+ [42][43][44]. Consequently, this additional contribution cannot be separated from that of the gold precursor.…”

Section: Effect Of the Stainless Steel Compositionmentioning

confidence: 98%

Gold Nanoparticles Synthesis Using Stainless Steel as Solid Reductant: A Critical Overview

et al. 2020

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Gold nanoparticles (AuNPs) were produced using stainless steel as a solid reductant to assist the synthesis of metal NPs, using HAuCl4 as a precursor. This method is very easy, quick, and cost-effective, allowing the synthesis of highly stable NPs without additional capping agents. However, the reaction mechanism is still under debate. In order to contribute to the investigation of the synthesis of AuNPs using stainless steel, different experimental conditions were tested. Cl− concentration, pH of the precursor solution, as well as stainless steel composition were systematically changed. The syntheses were performed recording the open circuit potential to potentiometrically explore the electrochemical properties of the system, under operando conditions. Spectroscopic and morphological characterizations were carried out along with potentiometric monitoring, aiming at correlating the synthesis parameters with the AuNPs characteristics. As a result, an overview of the process features, and of its most reasonable mechanism were obtained.

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“…Hydroxyl radical (OH  ) is known to have a higher oxidation potential (2.85 eV) than other widely used oxidants such as hydrogen peroxide (1.77 eV), ozone (2.07 eV) [10], atomic oxygen (2.42 eV) and chlorine (1.6 eV) [11]. OH  radicals are non-selective and their reactivity with most organic contaminants is higher than that of other oxidizing agents.…”

Section: Introductionmentioning

confidence: 99%

Assessing some advanced oxidation processes in the abatement of phenol aqueous solutions

Jaramillo-Sierra¹,

Mercado-Cabrera²,

Peña‐Eguiluz³

et al. 2019

Environ. Protect. Eng.

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In this work, phenol oxidation in aqueous solution promoted by the effect of the oxidizing agents H2O2, O3 and UV radiation and their synergy in four different advanced oxidation processes (O3, O3/UV, H2O2/O3 and O3/H2O2/UV) were assayed. Studies were performed with a closed-loop hydraulic circuit set up with a relatively high volume of solution (500 cm 3) during 90 min of treatment time. Parameters such as concentration for oxidizing species, pH, presence of UV irradiation were evaluated. The resulting degradation efficiencies were evaluated using GC-MS. The agents here used were selected considering their ease of handling and low toxicity, generation of deposited matter or sludge, so a filtration treatment for the analysis of the samples was not required. In all cases, it was observed that with increasing treatment time better degradation efficiencies were obtained. The best results were obtained with the combination of O3/H2O2/UV where up to 95% degradation was attained at pH 9, which is due to active species generated in the process, e.g., O3 and OH  , on the contaminant. SPE was performed for determining the presence of several by-products, mainly: catechol, resorcinol and hydroquinone, which were identified.

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Advanced Oxidative Degradation Processes: Fundamentals and Applications

Cited by 44 publications

References 71 publications

Application of response surface methodology in the degradation of Reactive Blue 19 using H2O2/MgO nanoparticles advanced oxidation process

Application of response surface methodology in the degradation of Reactive Blue 19 using H2O2/MgO nanoparticles advanced oxidation process

Gold Nanoparticles Synthesis Using Stainless Steel as Solid Reductant: A Critical Overview

Assessing some advanced oxidation processes in the abatement of phenol aqueous solutions

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