Modeling the mineralization and discoloration in colored systems by (US)Fe2+/H2O2/S2O82− processes: A proposed degradation pathway

Grčić, Ivana; Vujević, Dinko; Koprivanac, Natalija

doi:10.1016/j.cej.2009.10.042

Cited by 48 publications

(8 citation statements)

References 41 publications

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“…Concentrations of each dye were calculated by applying the Lambert-Beer equation to the measured absorbances at their respective l max . The concentrations of oxalic acid were determined according to the procedure described in previous publications 18,19 . To rule out the possible error due to removal of unreacted pollutant molecules absorbed to the surface of TiO 2 nanoparticles, additional adsorption tests in the dark were performed.…”

Section: Photocatalytic Experiments and Analysesmentioning

confidence: 99%

“…The corrected incident photon fluxes obtained by the proposed procedure were used for the calculation of e a in the photoreactor. Molar extinction coefficients for each dye at 254 and 365 nm of irradiation were given in previous works 14,18,19 .…”

Section: Light Absorption and Scatteringmentioning

confidence: 99%

“…aliphatic (oxalic acid) and aromatic (azo dyes). Having in mind the absorption of incident UVA and UVC irradiation by azo group in dye molecule, there is a significant difference in the incident light absorption properties and the complexity of corresponding degradation mechanisms 18,19 . In this study, photocatalytic efficiencies of two different commercially available TiO 2 powders; P25 by Evonik and PC500 by Millenium for degradation of azo dyes (C.I.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Oxidation of Azo Dyes and Oxalic Acid in Batch Reactors and CSTR: Introduction of Photon Absorption by Dyes to Kinetic Models

Grčić

Koprivanac

2018

Chem.Biochem.Eng.Q.

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The possibilities of treating industrial effluents and water purification by advanced oxidation processes have been extensively studied; photocatalysis has emerged as a feasible alternative solution. In order to apply the photocatalytic treatment on a larger scale, relevant modeling approaches are necessary. The scope of this work was to investigate the applicability of recently published kinetic models in different reactor systems (batch and CSTR) under UVA or UVC irradiation and in combination with two types of TiO 2 catalyst, AEROXIDE® P25 and PC-500 for degradation of azo dyes (C.I. Reactive Violet 2, and C.I. Mordant Yellow 10), oxalic acid and their mixtures. The influences of reactor geometry and irradiation intensities on pollutant oxidation efficiency were examined. The effect of photon absorption by dyes in water matrix was thoroughly studied. Relevant kinetic models were introduced to the mass balance for particular reactor system. Resulting models were sufficient for description of pollutant degradation in batch reactors and CSTR. Experimental results showed 1.15 times higher mineralization extents achieved after 7 cycles in CSTR than in batch photoreactor of similar geometry within the equivalent time-span. The application of CSTR in-series could simplify the photocatalytic water treatment on a larger scale.

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Section: Photocatalytic Experiments and Analysesmentioning

confidence: 99%

Section: Light Absorption and Scatteringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Oxidation of Azo Dyes and Oxalic Acid in Batch Reactors and CSTR: Introduction of Photon Absorption by Dyes to Kinetic Models

Grčić

Koprivanac

2018

Chem.Biochem.Eng.Q.

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“…It is reported that AOPs are effective techniques to degrade a wide range of azo dyes 1. Fenton reaction (Fe 2+ or Fe 3+ /H 2 O 2 ) and Photo‐Fenton reaction (H 2 O 2 /Fe 2+ or Fe 3+ /UV) are regarded as two of the most promising AOPs for the treatment of dye contaminated water, due to advantages such as safety, simplicity, cleanliness and energy conservation without causing secondary pollution 5,6. The incorporation of UV radiation into the Fenton process causes a dramatic increase in the · OH formation efficiency 7.…”

Section: Introductionmentioning

confidence: 99%

Green Oxidative Degradation of Methyl Orange with Copper(II) Schiff Base Complexes as Photo‐Fenton‐Like Catalysts

Fei¹,

Yan²,

Wang³

et al. 2014

Zeitschrift anorg allge chemie

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“…Several studies have been carried out with sulfate radicals for the degradation of a variety of chemical contaminants [19,20]. Peroxydisulfate anion, S2O8 −2 , by itself, is a strong oxidant and can be used as the source of sulfate radicals, but it slowly reacts with many organics [21].…”

Section: So4mentioning

confidence: 99%

Efficient Decolorization and Degradation of Amaranth Azo Dye via Photoelectrocatalytic Processes

El-Zomrawy

2012

Al-Azhar Bulletin of Science

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This work assesses the electrocatalytic (EC), photocatalytic (PC), and photoelectroncatalytic degradation (PEC) of Amaranth azo dye with ammonium persulfate (APS). The results were observed that the photoelectrocatalytic degradation technique more efficient than other techniques. The effects of operational parameters such as initial pH and APS concentrations on color removal efficiency were investigated. Decolorization and degradation were found to depend strongly on the system parameters. The dye decolorization was enhanced using pH 2.0. The rate of degradation of Amaranth with APS followed pseudo-first order kinetics in the dye concentration. Decolorization efficiency (%) and degradation rates of amaranth were increase with increasing APS concentration.

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Modeling the mineralization and discoloration in colored systems by (US)Fe2+/H2O2/S2O82− processes: A proposed degradation pathway

Cited by 48 publications

References 41 publications

Photocatalytic Oxidation of Azo Dyes and Oxalic Acid in Batch Reactors and CSTR: Introduction of Photon Absorption by Dyes to Kinetic Models

Photocatalytic Oxidation of Azo Dyes and Oxalic Acid in Batch Reactors and CSTR: Introduction of Photon Absorption by Dyes to Kinetic Models

Green Oxidative Degradation of Methyl Orange with Copper(II) Schiff Base Complexes as Photo‐Fenton‐Like Catalysts

Efficient Decolorization and Degradation of Amaranth Azo Dye via Photoelectrocatalytic Processes

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