Wells–Dawson polyoxometelates [HP2W18–nMonO62]Fe2.5, xH2O; n = 0, 6: Synthesis, spectroscopic characterization and catalytic application for oxidation of dyes

Bechiri, Ouahiba; Abbessi, Mostefa; Belghiche, Robila; Ouahab, Lahcène

doi:10.1016/j.crci.2013.07.002

Cited by 11 publications

(8 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2 show that the optimum pH value for the oxidation of AY99 by H 2 O 2 using the iron-substituted Wells-Dawson-type heteropolyanion HFe 2.5 P 2 W 12 Mo 6 O 62 .22H 2 O as catalyst is 3. This result agrees with those reported in Bechiri et al (2014), in which the oxidation of an azo dye (methyl violet) by H 2 O 2 in aqueous solution using a Dawson-type heteropolyanion (HFe 2.5 P 2 W 12 Mo 6 O 62 .22H 2 O) as catalyst was studied; in that work, the optimum pH was found to be about 3.…”

Section: Effect Of the Solution Phsupporting

confidence: 82%

“…The purity of the synthesized heteropolyanions was confirmed by 31 P NMR spectroscopy (Bechiri et al 2014). …”

Section: Experimental Section Reagentsmentioning

confidence: 99%

“…The catalyst HFe 1.5 P 2 W 12 Mo 6 O 61 , 22H 2 O was prepared starting from H 6 P 2 W 12 Mo 6 O 62 .24H 2 O according to the protocol described in Bechiri et al (2014).…”

Section: Experimental Section Reagentsmentioning

confidence: 99%

See 2 more Smart Citations

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

Self Cite

View full text Add to dashboard Cite

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 .

show abstract

Section: Effect Of the Solution Phsupporting

confidence: 82%

“…The purity of the synthesized heteropolyanions was confirmed by 31 P NMR spectroscopy (Bechiri et al 2014). …”

Section: Experimental Section Reagentsmentioning

confidence: 99%

See 1 more Smart Citation

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

Self Cite

View full text Add to dashboard Cite

show abstract

“…The Fe(III)-substituted heteropolyanions "HFe 2,5 Mo 6 P 2 W 18 O 62 ,23H 2 O" and the "HFe 2,5 P 2 W 12 Mo 6 O 62 ,22H 2 O" are used as catalysts in Fenton-like oxidation of the methyl violet dye, although the reaction is favored in the acidic medium. The same catalysts were used for the oxidation of the Acid yellow 99 and the acid orange 7 by H 2 O 2 [10,11]. However, there were no research reports done before on application of the vanadium-substituted heteropolyanion (α 1 P 2 W 17 VO 62 ) 6− as a catalyst for the oxidation of the organic compounds by the hydrogen peroxide.…”

Section: Introductionmentioning

confidence: 99%

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

2020

Self Cite

View full text Add to dashboard Cite

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 |

show abstract

“…However, Wells-Dawson type HPAs is shown to be more active for both acid-catalyzed and redox reactions (20,21). These catalytic systems were mainly used in oxidative desulfurization of fuel oil (10), epoxidation of olefins (14), oxidation of dyes (22), direct production of clean gasoline fuel through Fischer-Tropsch synthesis (23), Hydroisomerization-cracking (24) and other organic reactions (25). However, in this work, Wells-Dawson heteropoly acid/TiO 2 /beta zeolite was used as the photocatalytic system in the degradation of methyl orange.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Performance of H₆P₂W₁₈O₆₂/TiO₂ Nanocomposite Encapsulated into Beta Zeolite under UV Irradiation in the Degradation of Methyl Orange

Moosavifar

2018

Photochem & Photobiology

View full text Add to dashboard Cite

In this work, neat and supported H P W O into nanocage of β-zeolite were synthesized. However, H P W O into nanocage of β-zeolite was synthesized via template synthesis method. In addition, TiO was supported on H P W O /β zeolite by impregnation method. The obtained materials were characterized by XRD, FT-IR, UV-Vis, FESEM and EDS techniques. Also, W and Ti contents of the catalyst were determined by ICP and EDS technique. The results reveal that the photocatalyst performance depends on catalyst loading, pH effect, and methyl orange concentration. Photocatalytic degradation of methyl orange follows a pseudo-first order kinetic. The chemical oxygen demand (COD) experimental proved mineralization of methyl orange. Another reason for degradation and mineralization of methyl orange is the absence of hydrazine at the end of reaction which is one of the photodecolorization products. The plausible mechanism for photodegradation of MO was proposed.

show abstract

Wells–Dawson polyoxometelates [HP2W18–nMonO62]Fe2.5, xH2O; n = 0, 6: Synthesis, spectroscopic characterization and catalytic application for oxidation of dyes

Cited by 11 publications

References 25 publications

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

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

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

Photocatalytic Performance of H₆P₂W₁₈O₆₂/TiO₂ Nanocomposite Encapsulated into Beta Zeolite under UV Irradiation in the Degradation of Methyl Orange

Contact Info

Product

Resources

About

Wells–Dawson polyoxometelates [HP2W18–nMonO62]Fe2.5, xH2O; n = 0, 6: Synthesis, spectroscopic characterization and catalytic application for oxidation of dyes

Cited by 11 publications

References 25 publications

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

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

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

Photocatalytic Performance of H6P2W18O62/TiO2 Nanocomposite Encapsulated into Beta Zeolite under UV Irradiation in the Degradation of Methyl Orange

Contact Info

Product

Resources

About

Photocatalytic Performance of H₆P₂W₁₈O₆₂/TiO₂ Nanocomposite Encapsulated into Beta Zeolite under UV Irradiation in the Degradation of Methyl Orange