Fe–clay as effective heterogeneous Fenton catalyst for the decolorization of Reactive Blue 4

Hassan, H.; Hameed, B.H.

doi:10.1016/j.cej.2011.04.040

Cited by 206 publications

(70 citation statements)

References 26 publications

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“…In fact, after the thermal treatment, most of the hydroxyl groups have been removed by dehydroxylation (Hassan et al, 2011). All peaks that correspond to Si-O-Si groups are grouped in a single large band at 1060 cm…”

Section: Results and Discussion Characterizationmentioning

confidence: 99%

Improvement adsorption capacity of methylene blue onto modified Tamazert kaolin

Boukhemkhem

Rida

2017

Adsorption Science & Technology

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In this study, three adsorbents were prepared with the raw kaolin issued from the Tamazert region in Algeria (Tamazert kaolin (KT)), for the removal of basic dye methylene blue (MB) from aqueous solutions. The first absorbent, KT-1, was obtained by thermal treatment; the second, KT-2, was obtained by thermal followed by acid treatment; and the third, KT-3, was obtained by thermal followed by acid and alkaline treatments. These adsorbents were characterized by powder X ray diffraction, Fourier transform infrared spectroscopy, Brunauer-Emmett-Teller surface area, and scanning electron microscopy. Adsorption equilibrium isotherms of MB were correlated with common isotherm equations such as Langmuir and Freundlich models. The modified kaolins (KT-1, KT-2, and KT-3) showed different capacities of the equilibrium adsorption in comparison with raw kaolin (KT). The maximal adsorption capacity (111 mg g À1 ) was observed with modified kaolin (KT-3). The effect of operating parameters such as the initial dye concentration, contact time, adsorbent dose, pH, and temperature were studied onto KT-3. The removal of MB by adsorbent increased with an increase in adsorbent dose and initial concentration. Kinetics models, the pseudo-first-order, and pseudo-second-order rate equations were applied. The obtained results show that the adsorption of MB by KT-3 was well described by the pseudo-second-order kinetic model. The thermodynamic study revealed that the adsorption process was spontaneous, endothermic, and the positive value of ÁS indicated the affinity of MB molecules to the adsorbent surface. This study showed that this new adsorbent could be a good candidate for some activated carbons.

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Section: Results and Discussion Characterizationmentioning

confidence: 99%

Improvement adsorption capacity of methylene blue onto modified Tamazert kaolin

Boukhemkhem

Rida

2017

Adsorption Science & Technology

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“…However, with further increase in the amount of copper ions beyond the 5 wt.%, the decolorization efficiency of Methyle Orange reduced. This may be explained by the fact that higher concentration of copper ions could lead to the scavenging of • OH radicals by copper ions and induce the decrease in decolorization of Methyl Orange [23]. …”

Section:  Effect Of Catalyst Loadingmentioning

confidence: 99%

“…Consequently, the degradation rate is expected to be enhanced. But at high dosage, H 2 O 2 is a powerful HO • scavenger [23]. Addition of excess of H 2 O 2 results in a decrease in reaction rate.…”

Section:  Effect Of Peroxide Concentration On Dyementioning

confidence: 99%

Preparation and Characterisation A Catalytic System Cu-Clay for Catalytic Oxidation of Methyl Orange with H2O2

Idrissi¹,

Miyah²,

Lahrichi³

et al. 2014

IJIRSET

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ABSTRACT:In this work, the decolorization of Methyl Orange was conducted using catalysts prepared by impregnation of copper on natural clay in the presence of H 2 O 2 . The catalysts Cu-clay, prepared from the concentrated metal precursor of (impregnation ratio, W(Cu(NO 3 ) 2 )/W(clay) = 1,5%-7,5%) were characterized by several methods such as X-ray diffraction (XRD), electronic scan microscopy (SEM), x-ray fluorescence (FX), and Brunauer-EmmettTeller (BET). Important factors affecting catalyst activity and methyl orange removal efficiencies were studied: the effects of temperature, oxidant concentration, and catalyst dosage. The results showed, a very significant activation of hydrogen peroxide by the catalyst, the Methyl Orange depletion percentage reaching 94 % after 2 h, and very stability of the catalyst. It was also observed that the best catalyst, at a reaction temperature of 25°C. 2,5ml of H 2 O 2 and 4.0 g/L of 5% Cu-clay, 94% decolorization was achieved within 120 min treatment. Although the Cu show high activity, their stability and reusability still need improvement.

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“…The k app value was 0.323 min −1 at 55°C, which was more than seven times higher than that of 25°C. This can be explained by the fact that higher temperature provides reactant molecules with more energy, which allows more of them to overcome activation energy barrier of the chemical reactions involved (Hassan et al 2011). Simultaneously, higher heat energy provides more collision opportunities between PMS and catalyst's active sites and accelerates the formation of SO 4 − ·.…”

Section: Optimization Of Operational Parametersmentioning

confidence: 97%

Synthesis of magnetic CoFe2O4/ordered mesoporous carbon nanocomposites and application in Fenton-like oxidation of rhodamine B

Deng

Chen

Lü

et al. 2017

Environ Sci Pollut Res

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CoFeO/ordered mesoporous carbon (OMC) nanocomposites were synthesized and tested as heterogeneous peroxymonosulfate (PMS) activator for the removal of rhodamine B. Characterization confirmed that CoFeO nanoparticles were tightly bonded to OMC, and the hybrid catalyst possessed high surface area, pore volume, and superparamagnetism. Oxidation experiments demonstrated that CoFeO/OMC nanocomposites displayed favorable catalytic activity in PMS solution and rhodamine B degradation could be well described by pseudo-first-order kinetic model. Sulfate radicals (SO·) were verified as the primary reactive species which was responsible for the decomposition of rhodamine B. The optimum loading ratio of CoFeO and OMC was determined to be 5:1. Under optimum operational condition (catalyst dosage 0.05 g/L, PMS concentration 1.5 mM, pH 7.0, and 25 °C), CoFeO/OMC-activated peroxymonosulfate system could achieve almost complete decolorization of 100 mg/L rhodamine B within 60 min. The enhanced catalytic activity of CoFeO/OMC nanocomposites compared to that of CoFeO nanoparticles could be attributable to the increased adsorption capacity and accelerated redox cycles between Co(III)/Co(II) and Fe(III)/Fe(II).

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Fe–clay as effective heterogeneous Fenton catalyst for the decolorization of Reactive Blue 4

Cited by 206 publications

References 26 publications

Improvement adsorption capacity of methylene blue onto modified Tamazert kaolin

Improvement adsorption capacity of methylene blue onto modified Tamazert kaolin

Preparation and Characterisation A Catalytic System Cu-Clay for Catalytic Oxidation of Methyl Orange with H2O2

Synthesis of magnetic CoFe2O4/ordered mesoporous carbon nanocomposites and application in Fenton-like oxidation of rhodamine B

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