The effect of pH in the adsorption of Alizarin and Eriochrome Blue Black R onto iron oxides

Pirillo, Silvina; Ferreira, Marı́a Luján; Rueda, Elsa H.

doi:10.1016/j.jhazmat.2009.02.007

Cited by 66 publications

(44 citation statements)

References 32 publications

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“…The removal of ARS is crucial process from both economical and environmental points of view 1 . Various techniques for the removal of ARS from wastewater have been studied over the years, such as co-precipitation 2 , photocatalysis 3 , gliding arc discharge 4 , Fenton and Fenton like process 1 , electrochemical treatment 5 , fungal degradation 6 , Photocatalysis 7 and adsorption [8][9] . Among those techniques, adsorption has been found to be promising process superior to the other techniques for dye wastewater treatment in many advantage terms including operational cost, relative simplicity of design, easier operation and insensitivity to toxic matters 10 .…”

Section: Introductionmentioning

confidence: 99%

Adsorption Capacity of The As-Synthetic Graphene Oxide for The Removal of Alizarin Red S Dye from Aqueous Solution

Nuengmatcha¹,

Mahachai²,

Chanthai

2016

Orient. J. Chem

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This research was aimed to study the adsorption of Alizarin Red S (ARS) dye using graphene oxide (GO) as an adsorbent compared with bare graphite powder (BGP). For optimum conditions, the effects of the initial concentration of ARS, solution pH, adsorbent dosage, and contact time were investigated in detail. The optimum conditions for this work were consisted of 350 mg/L initial concentration of ARS with 0.02 mg adsorbent at pH 2.0. The adsorption equilibrium was completely reached within 30 min. The maximum adsorption capacity of GO was 88.50 mg/g which was higher than that of BGP (34.13 mg/g). The adsorption kinetics well fitted using a pseudo second-order kinetic model. The intraparticle diffusion model described that the intraparticle diffusion was not the only rate-limiting step. In thermodynamics diversion, changes in free energy (DG), enthalpy (DH) and entropy (DS) were also evaluated. The overall adsorption process was exothermic and spontaneous in nature. The adsorption isotherms for GO and BGP fit well with the Langmuir and Freundlich models, respectively. It is, therefore, evident that the as-prepared GO can be used as a high potential adsorbent for the anionic dye and it can be reused for fourth time of adsorption.

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Section: Introductionmentioning

confidence: 99%

Adsorption Capacity of The As-Synthetic Graphene Oxide for The Removal of Alizarin Red S Dye from Aqueous Solution

Nuengmatcha¹,

Mahachai²,

Chanthai

2016

Orient. J. Chem

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“…(Figure 2c) contient, pour sa part, de la bayerite et de la goethite (α-FeO(OH)) et existe sous forme de grains compacts. il faut noter que les hydroxydes de fer (PiRiLLO et al, 2007(PiRiLLO et al, , 2009) et d'aluminium (Li et al, 2009;MARANGONi et al, 2009) sont connus pour leurs propriétés adsorbantes vis-à-vis des colorants. Certains auteurs (viLGERiTTER, 1997) utilisent des sels de fer ou d'aluminium pour l'élimination des matières organiques.…”

Section: Essais De Décoloration Avec Les Composésunclassified

“…il apparaît ainsi que l'élimination par adsorption est influencée par la valeur du pH qui modifie la charge ionique de la surface de l'adsorbant, ainsi que le degré d'ionisation de l'adsorbat. Lorsque le pH initial du milieu est basique, il y a inversion de charge des hydroxydes à la surface des particules, ce qui diminue l'adsorption du colorant sur les particules d'hydroxydes métalliques (PiRiLLO et al, 2009) inchangé avec la hausse de la teneur en structure A1, constituée principalement d'hydroxydes d'aluminium.…”

Section: Décoloration à L'aide Des Composésunclassified

Décoloration des effluents par des structures adsorbantes générées par électrocoagulation avec des électrodes d’aluminium et de fer

Zidane

Qassid

Basri

et al. 2012

rseau

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Tous droits réservés © Revue des sciences de l 'eau, 2012 Ce document est protégé par la loi sur le droit d'auteur. L'utilisation des services d'Érudit (y compris la reproduction) est assujettie à sa politique d'utilisation que vous pouvez consulter en ligne.https://apropos.erudit.org/fr/usagers/politique-dutilisation/ Cet article est diffusé et préservé par Érudit.Érudit est un consortium interuniversitaire sans but lucratif composé de l'Université de Montréal, l'Université Laval et l'Université du Québec à Montréal. Il a pour mission la promotion et la valorisation de la recherche. abstractThe presence of dyes in industrial effluents represents a serious issue in many countries. This type of effluent is mainly discharged by textile and pulp and paper mill industries. The discharge of such effluents causes excessive oxygen demand in the receiving water and the effluents need to be treated before any discharge. This study describes a new option for the removal of this type of pollutant, which is the decolourization with adsorbing structures generated by electrocoagulation using aluminum and iron electrodes. Three solid structures have been produced in a 10 -2 mol NaCl•L -1 electrolyte solution. X-ray diffraction (XRD) and scanning electron microscope (SEM) analyses have shown that the structures produced using aluminum electrodes are constituted of bayerite (Al(OH) 3 ), whereas the structures produced using iron electrodes are principally composed of magnetite (Fe 3 O 4 ) and lepidocrocite (γ-FeO(OH)). The structures generated with both types of electrodes notably contain bayerite and goethite (α-FeO(OH)). ). The results demonstrated very high dye (94-99%) and COD (≤ 96%) removal yields, these removal percentages being sensitive to the solution pH.

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“…As a result, numerous studies report on the use of iron-containing minerals as adsorbents (Nowack et al, 2006;Rovira et al, 2008;Zeng et al, 2004;Spiteri et al, 2008;Guo et al, 2007;Zhang et al, 2004;Pirillo et al, 2009) and catalysts (Costa et al, 2008;Huang et al, 2000;Centi et al, 2000;Andreozzi et al, 2003;Du et al, 2008) for the removal of pollutants from wastewaters.…”

Section: Introductionmentioning

confidence: 99%

Catalytic wet peroxide oxidation of formic acid in wastewater with naturally-occurring iron ore

Erasmus¹,

Claassen²,

Westhuizen³

2016

WSA

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The catalytic wet oxidation of formic acid, using hydrogen peroxide as the oxidizing agent over naturally-occurring iron ore, was explored. Firstly, the decomposition of hydrogen peroxide to its hydroxyl radicals (HO • and HOO • ) over naturally-occurring iron ore was investigated. The reaction was monitored by ATR FTIR by following the disappearance of the O-H peak of H 2 O 2 at 2 860 cm -1 . Decomposition occurred according to the Fenton mechanism and resulted in observed first-order rate constants one order of magnitude faster than that without the catalyst. Turnover frequencies (TOF) of 1.97-8.85 x 10 -9 s -1 were obtained for the decomposition of H 2 O 2 . The wet oxidation of formic acid using hydrogen peroxide as the oxidizing agent over naturally-occurring iron ore reaction was also monitored by ATR FTIR, following the disappearance of the carbonyl stretching frequency of formic acid at 1 727 cm -1 . Experiments were performed at different hydrogen peroxide (2, 4, 6 and 8M) and formic acid (1.26, 2.52, 6.3 and 12.6 M) concentrations as well as with varying amounts of naturally-occurring iron ore catalyst, at pH = 2. Elevated hydrogen peroxide and formic acid concentrations led to increased observed first-order kinetics, as high as k obs = 21.75 x 10 -4 min -1 with a TOF = 1.73 x 10 -8 -1.12 x 10 -6 s -1 .

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The effect of pH in the adsorption of Alizarin and Eriochrome Blue Black R onto iron oxides

Cited by 66 publications

References 32 publications

Adsorption Capacity of The As-Synthetic Graphene Oxide for The Removal of Alizarin Red S Dye from Aqueous Solution

Adsorption Capacity of The As-Synthetic Graphene Oxide for The Removal of Alizarin Red S Dye from Aqueous Solution

Décoloration des effluents par des structures adsorbantes générées par électrocoagulation avec des électrodes d’aluminium et de fer

Catalytic wet peroxide oxidation of formic acid in wastewater with naturally-occurring iron ore

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