Adsorption kinetics and mechanism of cationic methyl violet and methylene blue dyes onto sepiolite

Doğan, Mehmet; Özdemir, Yasemin; Alkan, Mahir

doi:10.1016/j.dyepig.2006.07.023

Cited by 567 publications

(289 citation statements)

References 56 publications

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“…Similar results were found for methylene blue adsorption onto montmorillonite , methylene blue and crystal violet adsorption onto palygorskite (Al-Futaisi et al, 2007), basic yellow 28, methylene blue, and malachite green adsorption onto Iranian kaolin, (Tehrani-Bagha et al, 2011) and methylene blue and methyl violet adsorption onto sepiolite (Dogan et al, 2007). The results also indicated that an intra-particle diffusion mechanism played a significant role in the adsorption process, while the adsorption rate was controlled by a film-diffusion step (Ugurlu and Karaoglu, 2011;Yousef et al, 2011).…”

Section: Adsorption Kinetic Modelssupporting

confidence: 73%

“…Also, dyes can be effectively removed by an adsorption process in which dissolved dye compounds attach themselves to the surface of adsorbents. Various adsorbents such as: activated carbon (Khaled et al, 2009;Bangash and Alam, 2009;Schimmel et al, 2010), flay ash (Lin et al, 2008), sawdust (Bello et al, 2010), lignite (Pentari et al, 2009), bentonite (Bulut et al, 2008), sepiolite (Dogan et al, 2007), montmorillonite , polymers (Kim and Guiochon, 2005), resin (Coşkun, 2011), zeolite (Mesko et al, 2001), macroporous hydrogel (Li et al, 2010), orange peel (Mafra et al, 2013), chitosan (Piccin et al, 2011), etc. have been widely studied for dye removal from aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of adsorption of the dyestuff astrazon red violet 3rn (basic violet 16) on montmorillonite clay

Fìl

Yılmaz

Bayar

et al. 2014

Braz. J. Chem. Eng.

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-In this study, color removal by absorption from synthetically prepared wastewater was investigated using montmorillonite clay by adsorption. As dyestuff Astrazon Red Violet 3RN (Basic Violet 16) was used. Experimental parameters selected were pH, temperature, agitation speed, initial dyestuff concentration, adsorbent dosage and ionic strength. It was established that adsorption rate increased with increasing pH, temperature, dye concentration and agitation speed, but decreased with increased ionic strength and adsorbent dosage. Adsorption equilibrium data obtained by a series of experiments carried out in a water bath were employed with common isotherm equations such as Langmuir, Freundlich, Temkin, Elovich and Dubinin-Radushkevich. It was found that the Langmuir equation appears to fit the equilibrium data better than the other models. Furthermore, the fit of the kinetic data to common kinetic models such as the pseudofirst-order, second-order, Elovich and intraparticle diffusion models was tested to elucidate the adsorption mechanism. Kinetic data conformed to the pseudo-second-order model, indicating chemisorptions. In addition, the thermodynamic parameters activation energy, Ea, enthalpy ΔH*, entropy, ΔS*, and free energy change, ΔG*, were calculated. The values of the calculated parameters indicated that physical adsorption of ARV on the clay was dominant and that the adsorption process was endothermic.

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Section: Adsorption Kinetic Modelssupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Investigation of adsorption of the dyestuff astrazon red violet 3rn (basic violet 16) on montmorillonite clay

Fìl

Yılmaz

Bayar

et al. 2014

Braz. J. Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…However, strong chemical binding of the adsorbate with adsorbent requires a longer contact time for the attainment of equilibrium. Available adsorption studies in literature reveal also that the uptake of adsorbate species is fast at the initial stages of the contact period, and, thereafter, it becomes slower near the equilibrium (Dogan et al 2007). The initial rapid uptake of adsorbate species may be due to large numbers of available vacant sites on the adsorbent surface at the initial stage (Kavitha and Namasivayam 2007).…”

Section: Contact Timementioning

confidence: 99%

“…The mechanism of adsorption is generally considered to involve three steps, one or any combination of which can be the rate-controlling mechanism (Yang et al 2003). Thus, the intraparticle diffusion was not the only rate-limiting step, but other processes might control the rate of adsorption (Crini 2008;Dogan et al 2007). …”

Section: Comparison Of the Applicability Of Different Kinetic Modelsmentioning

confidence: 99%

“…Increasing the temperature is known to increase the rate of diffusion of the adsorbate molecules across the external boundary layer and in the internal pores of the adsorbent particles, owing to the decrease in the viscosity of the solution. In addition, changing temperature will change the equilibrium capacity of the adsorbent for a particular adsorbate (Dogan et al 2007). …”

Section: Initial Concentration and Temperaturementioning

confidence: 99%

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Adsorption of chromium (VI) from aqueous solution by the iron (III)-impregnated sorbent prepared from sugarcane bagasse

Zhu

Zhang

Zeng

et al. 2012

Int. J. Environ. Sci. Technol.

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An iron (III)-impregnated sorbent was prepared from sugarcane bagasse and ferric chloride solution via carbonization/activation in a muffle furnace at 500°C for 4 h. The adsorption removal of chromium (VI) from aqueous solution by the iron (III)-impregnated sorbent was then studied in a batch system. With increasing initial chromium (VI) concentration from 25 to 130 mg/L at an adsorbent dose of 300 mg/50 mL, the amount of adsorbed chromium (VI) increased from 4.15 to 12.20 mg/g at 20°C, from 4.16 to 12.50 mg/g at 30°C, and from 4.16 to 13.72 mg/g at 40°C. The dynamical data fit very well with the pseudo-second-order kinetic model, and the calculated adsorption capacities of 4.16, 8.37, and 13.37 mg/g were equal to the actual values of the experiments at the initial chromium (VI) concentrations of 25, 50, and 100 mg/L, respectively. The Langmuir isotherm could yield better fits than the Freundlich isotherm. The calculated isotherm parameters confirmed the favorable adsorption of chromium (VI) on the iron (III)-impregnated sorbent.

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Dye Wastewater Treatment by Adsorption

Ali

Qureshi

ALOthman

et al. 2017

Kirk-Othmer Encyclopedia of Chemical Technology

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The presence of dyes in waste effluents is a growing concern due to their health hazards and environmental pollution. The article focuses on the environmental impact and health hazards of dyes in industrial wastewater discharged into water bodies. Treatment and removal methods are discussed emphasizing removal by adsorption. Application of nanoadsorbents for the removal of dyes from polluted water is presented.

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Adsorption kinetics and mechanism of cationic methyl violet and methylene blue dyes onto sepiolite

Cited by 567 publications

References 56 publications

Investigation of adsorption of the dyestuff astrazon red violet 3rn (basic violet 16) on montmorillonite clay

Investigation of adsorption of the dyestuff astrazon red violet 3rn (basic violet 16) on montmorillonite clay

Adsorption of chromium (VI) from aqueous solution by the iron (III)-impregnated sorbent prepared from sugarcane bagasse

Dye Wastewater Treatment by Adsorption

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