The oxidation study of methyl orange dye by hydrogen peroxide using Dawson-type heteropolyanions as catalysts

Bechiri, Ouahiba; Abbessi, Mostefa; Ouahab, Lahcène

doi:10.1007/s11164-012-0807-3

Cited by 10 publications

(6 citation statements)

References 40 publications

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“…Beyond this value, there is a decrease of the discoloration efficiency. The excess of the catalyst does not appear to ply a positive role in the AO7 oxidation using [12,13,17]: the decrease of the discoloration efficiency of AO7 when increasing the mass of the catalyst can be explained by the presence of side reaction consuming the radicals hydroxyls. The mass of catalyst that gives the best result is 0.01 g.…”

Section: Effect Of Solution Phmentioning

confidence: 98%

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Degradation of organic dye using a new homogeneous Fenton-like system based on hydrogen peroxide and a recyclable Dawson-type heteropolyanion

2016

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Section: Effect Of Solution Phmentioning

confidence: 98%

“…The cell used during the experiments was made of 1 cm thick quartz. The oxidation efficiency (discoloration) was determined as it is shown below [12]:…”

Section: Procedures and Analysismentioning

confidence: 99%

Degradation of organic dye using a new homogeneous Fenton-like system based on hydrogen peroxide and a recyclable Dawson-type heteropolyanion

2016

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“…The activation enthalpy and the entropy were calculated using the Eyring equation in the thermodynamic formulation [25,26]: where ΔH * is the activation enthalpy; ΔS * is the activation entropy; k b = the boltzeman constant; h = the plank constant. The Eq.…”

Section: The Thermodynamic Studymentioning

confidence: 99%

The vanadium-substituted heteropolytungstate catalyzed oxidation of the organic dye by H2O2 in an aqueous solution

2020

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The main objective of this work is to study the oxidation of the acid orange 7 (AO7) in an aqueous solution by using the hydrogen peroxide in the presence of vanadium substituted heteropolytungstate (α 1 P 2 W 17 VO 62 ) 6− as a catalyst. The effects of various experimental parameters on the oxidation reaction of the dye were investigated. And they are as follow: The H 2 O 2 concentration, the mass of the catalyst, and the dye concentration. The optimum conditions were determined. In addition, it was found that the efficiency of the degradation is obtained after 80 min of reaction, and it was about 100%. The optimal parameters were: initial pH = 4; [H 2 O 2 ] 0 = 1 mM; catalyst mass = 0.05 g; for a concentration of the dye [AO7] 0 = 2 mg/L. The kinetic oxidation of the AO7 by this catalytic system was also elucidated and based on experimental data. The oxidation of the AO7 follows a pseudo second-order Kinetic model. The activation energy, as well as the activation enthalpy and the entropy were calculated by using respectively the Arrhenius and the Eyring equations. The oxidation of the AO7 by the H 2 O 2 and the (α 1 P 2 W 17 VO 62 ) 6− requires a small amount of energy and has an endothermic nature. KeywordsThe Vanaduim-substituted heteropolyanions · A homogeneous catalysis · The azo dyes · The hydrogen peroxide · A kinetic and thermodynamic study · The water treatment * Ouahiba Bechiri, bechirio@yahoo.fr |

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“…At a strongly acidic pH (\3), there is a risk that the catalyst will dimerize, while the catalyst is likely to deteriorate when the pH is above 8 (Bechiri et al 2012). Fig.…”

Section: Effect Of the Solution Phmentioning

confidence: 99%

“…The mass of the catalyst is a critical parameter in catalytic oxidation processes (Bechiri et al 2012). Thus, the effect of varying the catalyst mass on the AY99 decolorization efficiency was investigated in this work by varying the concentration of P 2 W 12 Mo 6 Fe 3?…”

Section: Effect Of the Catalyst Concentrationmentioning

confidence: 99%

Study of the degradation of a toxic dye by the catalytic system (H1.5Fe1.5P2W12Mo6O61, 22H2O)/H2O2

Tabaï

Bechiri

Abbessi

2017

Euro-Mediterr J Environ Integr

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acting as a catalyst was studied. The effects of different parameters-the initial pH, the initial H 2 O 2 concentration, the mass of the catalyst, and the initial dye concentrationon the oxidation of the dye were investigated. The optimal conditions that led to maximum decolorization were found to be: pH 3, catalyst mass = 0.05 g, and [H 2-O 2 ] 0 = 0.03 mM for an initial dye concentration of 30 mg L -1 .

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The oxidation study of methyl orange dye by hydrogen peroxide using Dawson-type heteropolyanions as catalysts

Cited by 10 publications

References 40 publications

Degradation of organic dye using a new homogeneous Fenton-like system based on hydrogen peroxide and a recyclable Dawson-type heteropolyanion

Degradation of organic dye using a new homogeneous Fenton-like system based on hydrogen peroxide and a recyclable Dawson-type heteropolyanion

The vanadium-substituted heteropolytungstate catalyzed oxidation of the organic dye by H2O2 in an aqueous solution

Study of the degradation of a toxic dye by the catalytic system (H1.5Fe1.5P2W12Mo6O61, 22H2O)/H2O2

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