Adsorption characteristics of natural zeolites as solid adsorbents for phenol removal from aqueous solutions: Kinetics, mechanism, and thermodynamics studies

Yousef, Rushdi I.; El‐Eswed, Bassam; Al-Muhtaseb, Ala’a H.

doi:10.1016/j.cej.2011.05.012

Cited by 467 publications

(211 citation statements)

References 37 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%

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%

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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“…Activated carbons, zeolites, biomaterials, clay minerals, and some industrial solid wastes have been used as sorbents for removal of ions and organics from water (Banat et al 2000;Kadirvelu et al 2000;Aksu and Yener 2001;Mohan and Singh 2002;Sljivic et al 2009;Yousef et al 2011;Quintelas et al 2012). Among these sorbent materials, activated carbons are the most widely used and exhibit good adsorption capacities for many organic pollutants due to their porous structures and large surface areas (Aksu and Yener 2001;Anbia and Ghaffari 2009;Nath and Bhakhar 2010;Zhou et al 2014).…”

Section: Responsible Editor: Philippe Garrigues Submitted To: Environmentioning

confidence: 99%

“…Chlorophenols are a class of widely occurring water pollutants released from industrial sources, including oil refining, coal conversion, and petrochemical production (Juang et al 1996;Banat et al 2000;Wang et al 2007;Shah et al 2011;Yousef et al 2011). They are also widely used as intermediates in the production of dyes, plastics, pharmaceuticals, pesticides, and insecticides (Radhika and Palanivelu 2006;Anbia and Lashgari 2009;Lua and Jia 2009;Liu et al 2010;Yang et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Sorption of chlorophenols on microporous minerals: mechanism and influence of metal cations, solution pH, and humic acid

Yang

Cheng

2016

Environ Sci Pollut Res

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Sorption of 2-chlorophenol (2-CP), 2,4-dichlorophenol (2,4-DCP), and 2,4,6-trichlorophenol (2,4,6-TCP) on a range of dealuminated zeolites were investigated to understand the mechanism of their sorption on microporous minerals, while the influence of common metal cations, solution pH, and humic acid was also studied. Sorption of chlorophenols was found to increase with the hydrophobicity of the sorbates and that of the microporous minerals, indicating the important role of hydrophobic interactions, while sorption was also stronger in the micropores of narrower sizes because of greater enhancement of the dispersion interactions. The presence of metal cations could enhance chlorophenol sorption due to the additional electrostatic attraction between metal cations exchanged into the mineral micropores and the chlorophenolates, and this effect was apparent on the mineral sorbent with a high density of surface cations (2.62 sites/nm 2 ) in its micropores. Under circum-neutral or acidic conditions, neutral chlorophenol molecules adsorbed into the hydrophobic micropores through displacing the Bloosely bound^water molecules, while their sorption was negligible under moderately alkaline conditions due to electrostatic repulsion between the negatively charged zeolite framework and anionic chlorophenolates. The influence of humic acid on sorption of chlorophenols on dealuminated Y zeolites suggests that its molecules did not block the micropores but created a secondary sorption sites by forming a Bcoating layer^on the external surface of the zeolites. These mechanistic insights could help better understand the interactions of ionizable chlorophenols and metal cations in mineral micropores and guide the selection and design of reusable microporous mineral sorbents for sorptive removal of chlorophenols from aqueous stream.

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“…Most important parameter, volumetric ratio had a maximum amount for phenol adsorption. The optimum conditions for coefficients of phenol was obtained rate=1.48 ml/h, voltage=300 kv, chitosan/ PVA volumetric ratio=50/50 and distance=20 cm [27][28][29][30][31][32][33][34].…”

Section: Optimization Of Electrospinning Parameters Ccd For Phenolmentioning

confidence: 99%

Characterization of Electrospinning Parameters of Chitosan/Poly(vinyl alcohol) Nanofibers to Remove Phenol via Response Surface Methodology

Ay¹,

Zilouei²,

Sn³

2018

Polym Sci

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Adsorption characteristics of natural zeolites as solid adsorbents for phenol removal from aqueous solutions: Kinetics, mechanism, and thermodynamics studies

Cited by 467 publications

References 37 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

Sorption of chlorophenols on microporous minerals: mechanism and influence of metal cations, solution pH, and humic acid

Characterization of Electrospinning Parameters of Chitosan/Poly(vinyl alcohol) Nanofibers to Remove Phenol via Response Surface Methodology

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