Binary ion exchange of metal ions in Y and X zeolites

Barros, Maria Angélica Simões Dornellas de; Zola, Andréia Soares; Arroyo, Pedro Augusto; Sousa-Aguiar, Eduardo Falabella; Tavares, Célia Regina Granhen

doi:10.1590/s0104-66322003000400008

Cited by 49 publications

(38 citation statements)

References 10 publications

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“…However, the preference of a zeolite for a particular cation in a multicomponent system depends on various factors, viz. Si/Al ratio, the exchangeable cation in the zeolite which should be analyzed for a better understanding of the ion-exchange mechanism [29].…”

Section: Nitrogen Management Through Zeolite Based Interventionsmentioning

confidence: 99%

Enhancing Nutrient Use Efficiency Using Zeolites Minerals—A Review

Bernardi¹,

Polidoro²,

Monte³

et al. 2016

ACES

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On tropical soils, liming and balanced nutrient supply are essential to ensure high crop yield and quality. An adequate agronomic nutrient management should be a balanced nutrition and fertilizers are the key factor on supplying nutrients. Urea is the most commonly used fertilizer-N source, despite potential losses by NH 3 volatilization. Thus, new fertilizers technologies are needed to support the increasing demand and avoid the low N use efficiency (NUE). The reduction of NH 3 -N volatilization can be achieved by the use of natural aluminosilicates with nitrogenous fertilizer materials. This review consolidates the current status on the subject and the experience with the application of aluminosilicates as a slow release plant-nutrient fertilizer. Volatilization losses of nitrogenous fertilizers on the soil surface could be reduced with addition of natural aluminosilicates. Clay minerals (zeolites) are widely used in many countries to reduce NH 3 volatilization from amide N fertilizers, such as urea, besides several organic forms of nitrogenous sources. The reduction in ammonia losses by volatilization and the increased efficiency of N utilization and slow release nature of urea-zeolite mixtures when urea is used together with aluminosilicates was demonstrated in laboratory, greenhouse and field experiments with different crops and environments. These results indicate that aluminosilicates minerals used with urea mineral fertilizer can enhance the efficiency of this source by improving the nitrogen use through the control of retention of ammonium ion, contributing to increasd N uptake and crop yields.

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Section: Nitrogen Management Through Zeolite Based Interventionsmentioning

confidence: 99%

Enhancing Nutrient Use Efficiency Using Zeolites Minerals—A Review

Bernardi¹,

Polidoro²,

Monte³

et al. 2016

ACES

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“…Tech., 7 (3), 497-508, Summer 2010 Effect of competitive ions The presence of competitive ions affects the sorption of cadmium. For example calcium could compete with cadmium sorption; and cadmium and chromate could compete with humic acid sorption (Barros et al, 2003 ;Chandra Rao et al, 2006;Terdkiatburana et al, 2008). The effect of calcium competition with cadmium was investigated by adding 100, 200, 500, 1000, 2000 and 1000 mg/L to a solution containing 100 mg/L of Cd.…”

Section: Pearson Correlation Test Showed Thatmentioning

confidence: 99%

Removal of cadmium and humic acid from aqueous solutions using surface modified nanozeolite A

Tashauoei

Attar

Amin

et al. 2010

Int. J. Environ. Sci. Technol.

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ABSTRACT:The sorption of cadmium and humic acids from aqueous solutions using surface-modified nanozeolite A has been investigated under various examination conditions. The morphology of untreated and treated nanozeolite was studied under scanning electron microscope and transmission electron microscope. Isotherms of cadmium adsorption onto surfacemodified nanozeolite A were studied at different pH, solid to liquid ratio, adsorbate concentration and interaction time. Kinetic and equilibrium studies were conducted and the equilibrium data have been analyzed using Langmuir and Freundlich isotherm models. The study revealed that experimental results were in agreement with the Freundlich model. The Langmuir monolayer adsorption capacity was found to be 1666.67 g cadmium and 6.75 g humic acid per gram of modified nanozeolite A, which is higher than that of reported value for other zeolites. The sorption ability was enhanced by surface modification and reduction in size and enabled the zeolite to adsorb cadmium. The adsorption of cadmium and humic acid on nanozeolite was found to be the highest at pH 6 and 3, respectively. Results showed that solid to liquid ratio and pH are the most important factors for cadmium and humic acid removal, respectively. Effect of competitive ions was studied and results showed that there is no competition between cadmium and humic acid sorption and presence of these ions.

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“…In order to obtain, as far as possible, the homoionic sodium form, zeolites, as received, were contacted four times with 1 Mol/L solutions of NaCl at 60 • C with a ratio of zeolite to solution of 1:10. Samples were then washed each time with 2 L of hot deionised water and oven-dried at 100 • C ( Barros et al, 2003b). For dynamic runs, zeolites NaY and NaX were pelletized, screened and collected in an average diameter size of 0.180 mm.…”

Section: Zeolitesmentioning

confidence: 99%

Chromium uptake from tricomponent solution in zeolite fixed bed

et al. 2006

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Removal of Cr 3+ , Ca 2+ , Mg 2+ and K + in equilibrium isotherms and in tricomponent solutions (Cr/Ca/K, Cr/Ca/Mg and Cr/Mg/K) were investigated in NaX and NaY packed beds at 30 • C. The equilibrium selectivity was obtained as Cr +3 > Mg 2+ > Ca 2+ ≈ K + for zeolite NaY and Ca 2+ Cr 3+ > Mg 2+ ≈ K + for zeolite NaX. The breakthrough curves showed sequential ion exchange where chromium ions are able to replace the competing cations. Some mass transfer parameters, such as length of unused bed and overall mass transfer coefficient, were investigated. Chromium retention was also investigated through a mass balance. Based on the breakthrough results, it was concluded that chromium-uptake mechanism was hardly influenced by the competition and interaction between the entering ions. NaY showed a higher affinity towards Cr 3+ for both equilibrium and dynamic systems and its sites were more efficiently used in the ion exchange process. Chromium was less retained in NaX due to the high selectivity towards calcium ions.

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Binary ion exchange of metal ions in Y and X zeolites

Cited by 49 publications

References 10 publications

Enhancing Nutrient Use Efficiency Using Zeolites Minerals—A Review

Enhancing Nutrient Use Efficiency Using Zeolites Minerals—A Review

Removal of cadmium and humic acid from aqueous solutions using surface modified nanozeolite A

Chromium uptake from tricomponent solution in zeolite fixed bed

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