Removal of lead from aqueous solutions by using the natural and Fe(III)-modified zeolite

Kragović, Milan; Daković, Aleksandra; Sekulić, Živko; Trgo, Marina; Ugrina, Marin; Perić, Jelena; Gatta, G. Diego

doi:10.1016/j.apsusc.2011.12.002

Cited by 116 publications

(48 citation statements)

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“…Recent studies of desorption efficiency of metal ions and regeneration natural zeolite -clinoptilolite are presented in Sorption of ions on to iron modified natural zeolite depends on the success of chemical modification and creation of iron hydroxide on its surface. Effect of solution pH and initial concentration of arsenic ions in water are very important for removal efficiency of arsenic ions [7,44]. The sorption efficiency of arsenic ions on to iron modified zeolite (Serbia) decreases in the order: Pb (II)> As (V)> Mn (II)> As (III)  Cr (VI) (Figure 10 (left).…”

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confidence: 99%

“…According to literature data, two mechanisms of arsenic binding on the surface of iron oxi-hydroxide are: the mechanism of surface precipitation and the mechanism of surface complexation. Surface complexation mechanism can be monodentate, dominant at a low surface coverage of modified zeolite, or bidendate at higher surface coverage when iron forms complexes with arsenic [42][43][44]. …”

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confidence: 99%

“…Reaction occurs spontaneously at a given temperature if ΔG 0 is negative. The standard Gibbs free energy change (ΔG 0 ) for the adsorption of ions by natural or modified zeolite can be calculated using the following thermodynamic equation (7):where T is the absolute temperature and R is the gas constant (8.314 J/molK) [44]. Table 7.…”

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Natural Zeolites in Water Treatment – How Effective is Their Use

Margeta¹,

Logar²,

Šiljeg³

et al. 2013

Water Treatment

146

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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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Natural Zeolites in Water Treatment – How Effective is Their Use

Margeta¹,

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Šiljeg³

et al. 2013

Water Treatment

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“…However, in some reports, not all parameters have been taken into consideration, and, in other cases, the values used for these parameters were not experimentally justified. See, for example, the results reported by Inglezakis et al (2002Inglezakis et al ( , 2003 and Kragovic et al (2012).…”

Section: Introductionmentioning

confidence: 85%

“…Particularly, clinoptilolite-type zeolite has been used successfully for removing lead from contaminated water (Bailey et al 1999;Inglezakis et al 1999;Inglezakis et al 2002Inglezakis et al , 2003Babel and Kurniawan Electronic supplementary material The online version of this article (doi:10.1007/s13762-016-0956-9) contains supplementary material, which is available to authorized users. & M. S. Pomares-Alfonso mpomares@imre.oc.uh.cu 2003; Ramos et al 2004;Sprynskyy et al 2006;Castaldi et al 2008;Wang and Peng 2010;Misaelides 2011;Kragovic et al 2012). More recently, sorption of lead and other heavy metals in natural and Fe(III)-modified zeolite has been reported (Kragovic et al 2013a, b;Sirotiak et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Cuban zeolite for lead sorption: application for water decontamination and metal quantification in water using nondestructive techniques

Enamorado-Horrutiner

Villanueva-Tagle

Behar

et al. 2016

Int. J. Environ. Sci. Technol.

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In the present paper, a Cuban clinoptilolite-type zeolite was used as lead sorbent. The effect of chemical conditioning with 1 mol L -1 NaCl, NaOH and NH 3 solutions at room temperature on the ion exchange capacity for lead uptake by clinoptilolite has been investigated. According to the batch experiments, NH 3 -treated clinoptilolite exhibited the highest sorption capacity. For this material, the effect that contact time, solid-to-liquid ratio and pH have on the removal of lead from aqueous solutions was comprehensively analyzed, and the most suitable values for these parameters were selected afterward. The pseudo-second-order kinetic model was appropriate for the description of the kinetic performance of the sorption. The Langmuir and Freundlich isotherm models were applied to describe sorption process, and the best fit was reached by using the Freundlich model. The nondestructive techniques, namely particle-induced X-ray emission and X-ray fluorescence, have successfully been evaluated for determining lead concentration in water by its concentration in zeolite. In addition, the more traditional flame atomic absorption spectrometry determination of lead in water was also improved.

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