The ionic exchange process of cobalt, nickel and copper(II) in alkaline and acid-layered titanates

Cardoso, Viviane de A.; Souza, A. G.; Sartoratto, P.P.C.; Nunes, Liliane M.

doi:10.1016/j.colsurfa.2004.09.012

Cited by 64 publications

(25 citation statements)

References 21 publications

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“…The most widely used methods for removing heavy metals are chemical or electrochemical precipitation, both of which pose a significant problem in terms of disposal of the precipitated wastes [2,3], and ion-exchange treatments, which do not appear to be economical [4]. It has been reported that some aquatic plants [5,6], agricultural byproducts [7][8][9], sawdust [10], * Tel.…”

Section: Introductionmentioning

confidence: 99%

Use of clinoptilolite for the removal of nickel ions from water: Kinetics and thermodynamics

Argun

2008

Journal of Hazardous Materials

194

130

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Section: Introductionmentioning

confidence: 99%

Use of clinoptilolite for the removal of nickel ions from water: Kinetics and thermodynamics

Argun

2008

Journal of Hazardous Materials

194

130

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“…There are many methods for the removal of toxic metals from industrial effluents such as chemical or electrochemical precipitation (Esalah et al 2000), ion exchange (Cardoso et al 2004), adsorption on minerals, and reverse osmosis (Weirich et al 2002). Compared with the other processes, adsorption of metal ions onto insoluble compounds as adsorbent is the most effective and widely used method (Zhou et al 2004).…”

mentioning

confidence: 99%

Adsorption of Lead and Cadmium from Aqueous Solution by Using Almond Shells

Mehrasbi

Farahmandkia

Taghibeigloo

et al. 2008

Water Air Soil Pollut

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The potential of almond shells was assessed for adsorption of heavy metal ions such as Pb 2+ and Cd 2+ from aqueous solution. Almond shells were pretreated separately with 0.4 mol/L NaOH, 0.4 mol/L HNO 3 , and distilled water and their adsorption abilities were compared. Batch adsorption experiments were carried out as a function of the initial ion concentration, pH, and adsorbent dosage. Adsorption isotherms of metal ions on adsorbents were determined and correlated with common isotherm equations such as Langmuir, Freundlich, and BET models. The alkali-modified almond shells had adsorption capacities for Pb 2+ from 2 to 9 mg/g and for Cd 2+ from 2 to 7 mg/g, which was much higher than acidand water-pretreated adsorbents. Experimental results showed that the best pH for adsorption was 5-6 and the adsorption values decreased with lowering pH. Isotherm models indicated the best fit for Langmuir model for alkali-modified almond shells. In comparing the parameters of the models, it was observed that the affinity of almond shells for adsorption of lead is stronger than affinity for adsorption of cadmium.Keywords Adsorption . Heavy metal . Low-cost adsorbent . Almond shell . Plant waste Nomenclature q amount of metal ion adsorbed per specific amount of adsorbent (milligrams per gram) C residual metal ion concentration (milligrams per liter) C 0 initial metal ion concentration (milligrams per liter) q m amount of metal ions required to form a monolayer (milligrams per gram) nFreundlich equilibrium constant indicative of bond energies between metal ion and adsorbent K L Langmuir equilibrium constant related to the energy of adsorption (liters per milligram) K B BET constant K F Freundlich equilibrium constant related to bond strength (milligrams per gram) C s solute concentration at the saturation of all layers (milligrams per liter) m adsorbent mass R 2 correlation coefficients 1 Introduction

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“…Шаруваті титанати різного складу широко використовують як неорганіч-ні іонообмінні матеріали. Титанати натрію та калію ефективно видаляють іони міді, нікелю та кобальту та показують іонообмінну ємність до 2,6 ммоль/г [11].…”

Section: літературний оглядunclassified