Utilization of natural zeolite as ion-exchange and sorbent material in the removal of iron

Al-Anber, Mohammed A.; Al-Anber, Zaid Ahmed

doi:10.1016/j.desal.2007.07.006

Cited by 94 publications

(36 citation statements)

References 36 publications

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“…The significant increase in the uptake was observed when the dose increased from 10 to 50 g/L, while further addition of the adsorbent beyond this concentration did not cause any significant change in the adsorption which may be due to the formation of clusters of adsorbent particles leading to a decrease in the surface area. These results are parallel with studies carried out with natural zeolite, quartz and white silica sand [26][27][28].…”

Section: Effect Of Adsorbent Dosesupporting

confidence: 78%

Purification of Crude Phosphoric Acid and Leached Apatite by Solvent Extraction with CYANEX 923 in Kerosene

Ahmed

Ammanoeil

Saad

et al. 2018

Period. Polytech. Chem. Eng.

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Section: Effect Of Adsorbent Dosesupporting

confidence: 78%

Purification of Crude Phosphoric Acid and Leached Apatite by Solvent Extraction with CYANEX 923 in Kerosene

Ahmed

Ammanoeil

Saad

et al. 2018

Period. Polytech. Chem. Eng.

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“…Several authors have used adsorption models to describe experimental data for ion exchange in zeolites and other materials (Misak, 1995;Malekian et al, 2010;Ostroski et al, 2009;Al-Anber and Al-Anber, 2008, Silva et al, 2003, Torab-Mostaedi et al, 2010, Senthil Kumar et al, 2010. In applying such models, one should bear in mind that the ion exchange process is the most important sorption mechanism although the subsequent adsorption phenomena should not be neglected.…”

Section: Isotherm Constructionmentioning

confidence: 99%

Determination of the maximum retention of cobalt by ion exchange in h-zeolites

Zola

Barros

Sousa-Aguiar

et al. 2012

Braz. J. Chem. Eng.

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-This work aimed to determine the maximum content of cobalt that can be incorporated by ion exchange in zeolites H-USY, H-Beta, H-Mordenite, and H-ZSM-5. To reach this goal, batch isotherms at 75ºC were constructed after addition of zeolite samples in flasks filled with cobalt nitrate solution. The equilibrium data were fitted to Langmuir, Freundlich, and Tóth adsorption isotherm models. Langmuir was the best model for zeolites H-Beta, H-Mordenite, and H-ZSM-5, whereas experimental data for H-USY were better fitted to the Freundlich isotherm model. From the isotherms, it was possible to determine the maximum cobalt exchange level (q max ) that can be incorporated in each zeolite through ion exchange. In this sense, H-USY presented the highest q max value (2.40 meq/g zeol ), while H-ZSM-5 showed the lowest one (0.64 meq/g zeol ).These results also show the influence of the zeolite framework related to the channel system, pore opening, presence of cavities and secondary porosity and SiO 2 /Al 2 O 3 ratio (SAR) on the maximum capacity and behavior of cobalt ion exchange in protonic zeolites.

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“…Several isotherm models (Table 6) are available to describe the equilibrium sorption distribution. In most studies the following two models, Langmuir and Freundlich models, were used [51]. where qe is metal concentration on the zeolite at equilibrium (mg of metal ion/g of zeolite);…”

Section: Adsorption Isothermsmentioning

confidence: 99%

“…The degree of goodness of the linear plot of these kinetic models can be judged from the value of the coefficient of determination of the plot, which can also be regarded as the criterion in the determination of adequacy of a kinetic model [51,[63][64].…”

Section: Kinetics Of the Adsorption Processmentioning

confidence: 99%

Natural Zeolites in Water Treatment – How Effective is Their Use

Margeta¹,

Logar²,

Šiljeg³

et al. 2013

Water Treatment

166

150

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Additional information is available at the end of the chapter http://dx.doi.org/10.5772/50738 IntroductionNatural zeolites are environmentally and economically acceptable hydrated aluminosilicate materials with exceptional ion-exchange and sorption properties. Their effectiveness in different technological processes depends on their physical-chemical properties that are tightly connected to their geological deposits. The unique treedimensional porous structure gives natural zeolites various application possibilities. Because of the excess of the negative charge on the surface of zeolite, which results from isomorphic replacement of silicon by aluminum in the primary structural units, natural zeolites belong to the group of cationic exchangers. Numerous studies so far have confirmed their excellent performance on the removal of metal cations from wastewaters. However, zeolites can be chemically modified by inorganic salts or organic surfactants, which are adsorbed on the surface and lead to the generation of positively charged oxihydroxides or surfactant micelles, and which enables the zeolite to bind also anions, like arsenates or chromates, in stable or less stable complexes. Natural zeolites have advantages over other cation exchange materials such as commonly used organic resins, because they are cheap, they exhibit excellent selectivity for different cations at low temperatures, which is accompanied with a release of non-toxic exchangeable cations (K + , Na + , Ca 2+ and Mg 2+ ) to the environment, they are compact in size and they allow simple and cheap maintenance in the full-scale applications. The efficiency of water treatment by using natural and modified zeolites depends on the type and quantity of the used zeolite, the size distribution of zeolite particles, the initial concentration of contaminants (cation/anion), pH value of solution, ionic strength of solution, temperature, pressure, contact time of system zeolite/solution and the presence of other organic compounds and anions. For water treatment with natural zeolites, standard procedures are used, usually a procedure in column or batch process. Ion exchange and adsorption properties of natural zeolites in comparison with other chemical and biological processes have the advantage of Water Treatment 82removing impurities also at relatively low concentrations and allows conservation of water chemistry, if the treatment is carried out in the column process [1]. Subject of further academic and industrial research should be to improve the chemical and physical stability of modified zeolites and to explore their catalytic properties, which would allow their use in catalytic degradation of organic pollutants. More careful consideration of their superb metal removal properties and awareness of possible regeneration or further use of contaminant/metal-loaded forms can considerably increase their environmental application possibilities, with a focus the reduction of high concentrations of cations and anions in drinking water and wastewater, for surface, und...

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Utilization of natural zeolite as ion-exchange and sorbent material in the removal of iron

Cited by 94 publications

References 36 publications

Purification of Crude Phosphoric Acid and Leached Apatite by Solvent Extraction with CYANEX 923 in Kerosene

Purification of Crude Phosphoric Acid and Leached Apatite by Solvent Extraction with CYANEX 923 in Kerosene

Determination of the maximum retention of cobalt by ion exchange in h-zeolites

Natural Zeolites in Water Treatment – How Effective is Their Use

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