Effect of solution pH, ionic strength, and temperature on adsorption behavior of reactive dyes on activated carbon

Al‐Degs, Yahya S.; El‐Barghouthi, Musa I.; El‐Sheikh, Amjad H.; Walker, Gavin

doi:10.1016/j.dyepig.2007.03.001

Cited by 1,122 publications

(511 citation statements)

References 35 publications

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“…Similar result was reported elsewhere by Hameed and El-Khaiary (2008). In case of azo dye AB, if the electrostatic interaction was the only step involved in the adsorption process, then, the % adsorption would have been maximum at pH ranging from 2.5 to 5.5 where the adsorbent surface will be negatively charged and the dye will be protonated as -SO 3 H. But in the observed process, JSAC might have interacted with the dye molecules through hydrogen bonding and hydrophobic-hydrophobic mechanisms as reported elsewhere by Al-Degs et al (2008). Hence the adsorption of AB onto JSAC was maximum at pH 2.3.…”

Section: Influence Of Initial Phmentioning

confidence: 89%

Adsorption isotherms, kinetics and mechanism for the adsorption of cationic and anionic dyes onto carbonaceous particles prepared from Juglans regia shell biomass

Nethaji

Sivasamy

Mandal

2012

Int. J. Environ. Sci. Technol.

333

177

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In the present study, Juglans regia shells were used to prepare activated carbon by acid treatment method. J. regia shell-based activated carbon was used for the adsorption of two synthetic dyes namely, a basic dye malachite green and an acid dye amido black 10B. The prepared adsorbent was crushed and sieved to three different mesh sizes 100, 600 and 1,000 lm. The adsorbent was characterized by scanning electron microscopy, surface acidity and zero-point charge. Batch experiments were carried out by varying the parameters like initial aqueous phase pH, adsorbent dosage and initial dye concentration. The equilibrium data were tested with Langmuir, Freundlich, Redlich-Peterson and Sips isotherm at three different temperatures 293, 300 and 313 K and it was found that the Freundlich isotherm best fitted the adsorption of both the dyes. Kinetic data were tested with pseudo first-order model and pseudo second-order model. The mechanism for the adsorption of both the dyes onto the adsorbent was studied by fitting the kinetic data with intraparticle diffusion model and Boyd plot. External mass transfer was found to be the rate-determining step. Based on the ionic nature of the adsorbates, the extent of film diffusion and intraparticle diffusion varied; both being system specific. Thermodynamic parameters were also calculated. Finally, the process parameters of each adsorption system were compared to develop the understanding of the best suitable system.

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Section: Influence Of Initial Phmentioning

confidence: 89%

Adsorption isotherms, kinetics and mechanism for the adsorption of cationic and anionic dyes onto carbonaceous particles prepared from Juglans regia shell biomass

Nethaji

Sivasamy

Mandal

2012

Int. J. Environ. Sci. Technol.

333

177

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“…As mentioned above, the pH of the point of zero charge (pH zpc ) is one of the parameters that characterises the surface chemical properties of the studied materials. The pH zpc is pH above which total surface of the sorbent is negatively charged while the surface has a positive charge at pH < pH zpc [19].…”

Section: Impact Of Ph On Sorption Of Metalloidsmentioning

confidence: 99%

“…The pH of the point of zero charge is understood as the pH above which the total surface of a sorbent is negatively charged while the surface at pH < pH zpc has a positive charge [19].…”

Section: Characterisation Of Sorbentsmentioning

confidence: 99%

Sorption of V and VI group metalloids (As, Sb, Te) on modified peat sorbents

Ansone-Bertina

Kļaviņš

2016

Open Chemistry

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Abstract:The present work investigates arsenic, antimony and tellurium sorption using iron modified peat. The results were obtained using batch tests and the sorption was studied as a function of initial metalloid concentration, pH and sorption time, as well as the presence of competing substances. The obtained results indicate that modification of peat with Fe compounds significantly enhances the sorption capacity of the sorbents used for sorption of arsenic, antimony and tellurium. The optimal pH interval for the sorption of Sb(III) is 6.5-9 and for As(V) and Sb(V) -3-6, while As(III) and tellurium sorption using Fe-modified peat is favourable in a wider interval of 3-9. The presence of competing ions as well as HA affect sorption of metalloids on Fe-modified peat. A minor impact on the reduction of metalloid sorption was detected in the presence of nitrate, sulphate, carbonate and tartrate ions, while in the presence of phosphate and HA the sorption ability of metalloids can be considerably reduced. The obtained results of kinetic experiments indicate that sorption of metalloids on Fe-modified peat mainly occurs relying on mechanisms of physical sorption processes.Keywords: peat, sorbents, arsenic, antimony, tellurium, metalloids Environmental contextGrowing attention is being paid to environmental pollution with metalloids (As, Sb, Te) requiring new approaches for removal of these elements from water. The present work investigates arsenic, antimony and tellurium sorption using iron modified peat. Iron modified peat has high sorption capacity in respect to all environmentally relevant metalloid speciation forms [As(V), As(III), As(org.), Sb(III), Sb(V), Te(IV) and Te(VI)]. The sorption takes place according to mechanisms of physical sorption and is affected by pH of a solution as well as competing ions.

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“…So it's necessary to produce relatively inexpensive adsorbents which can be used for the treatment of waste water. Recently many researches were more interested in the use of various low-cost adsorbents, which also seem to be suitable to late substitute activated carbon [9]. A wide variety of low-cost materials such as natural clay [10], oil shale ash [11], bagasse fly ash [12,13], sawdust [14], maize cob [15], peat [16,17], white rice husk ash [18], cornelian cherry, apricot kernel, almond shell [19], orange peel [20], wheat bran [21] ... has been used successfully for the removal of dyes in aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Direct Yellow 50 Dye Adsorption onto Marble Powder Sorbents

Diouri¹,

Chaqroune²,

Kherbeche³

et al. 2014

IJIRSET

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ABSTRACT:The aim of this present work is evaluation of the effect of marble powder, which is an industrial discharge, in the adsorption of a direct "yellow 50" dye, used in traditional industries of textile. On the other hand, various techniques for characterizing the adsorbent were used, in particular X-ray Diffraction (XRD), X-ray Fluorescence spectroscopy, Scanning Electron Microscopy (SEM), Fourier Transform Infrared spectroscopy (FTIR) and Raman spectroscopy. The effect of various experimental factors; adsorbent dose, contact time (equilibrium is established after 20 minutes), dye concentration and pH media, were studied by using the batch technique. The isotherms of adsorption data were analyzed by various adsorption isotherm models such as Langmuir and Freundlich. The dye yellow adsorption by marble powder made have excellent performance related to the adsorption potential.

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Effect of solution pH, ionic strength, and temperature on adsorption behavior of reactive dyes on activated carbon

Cited by 1,122 publications

References 35 publications

Adsorption isotherms, kinetics and mechanism for the adsorption of cationic and anionic dyes onto carbonaceous particles prepared from Juglans regia shell biomass

Adsorption isotherms, kinetics and mechanism for the adsorption of cationic and anionic dyes onto carbonaceous particles prepared from Juglans regia shell biomass

Sorption of V and VI group metalloids (As, Sb, Te) on modified peat sorbents

Kinetics of Direct Yellow 50 Dye Adsorption onto Marble Powder Sorbents

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