Separation of Heavy Metal Chelates by Activated Carbon: Effect of Surface and Species Charge

Jevtitch, M.; Bhattacharyya, Dibakar

doi:10.1080/00986448308940474

Cited by 26 publications

(3 citation statements)

References 8 publications

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“…Strong chelating agents were added in order to improve the cadmium removal efficiency of the Filtrasorb 400 (Filtrasorb 400 adsorbs primarily anionic species). Jevtitch and Bhattacharyya [68] established the adsorption capacities of complexed heavy metal ions by activated carbons under equilibrium conditions. An extensive experimental investigation was conducted with activated carbons to establish the adsorption capacities of heavy metals (Cd, Ni and Zn) in the presence of complexing agents (EDTA, triethylenetetramine (TRIEN), citrate, etc.).…”

Section: Activated Carbon As Adsorbentmentioning

confidence: 99%

A comprehensive review on Cd(II) removal from aqueous solution

Purkayastha

Mishra

Biswas

2014

Journal of Water Process Engineering

170

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Section: Activated Carbon As Adsorbentmentioning

confidence: 99%

A comprehensive review on Cd(II) removal from aqueous solution

Purkayastha

Mishra

Biswas

2014

Journal of Water Process Engineering

170

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“…Most experiments were conducted with OL 20 x 50 activated carbon which the pH of zero point of charge (pH,,,) was found to be 9.0 ? 0.2 [14]. Comparative experiments were also done with Filtrasorb 400 activated carbon which exhibited a lower pH,,, of 7.0 ?…”

Section: Kinetics Studymentioning

confidence: 99%

Activated carbon adsorption of heavy metal chelates from single and multicomponent systems

Bhattacharyya

Cheng

1987

Environ. Prog.

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Depart men t of C h em i cal Eng i neer i ng , U n iversi ty of Kentucky , Lexi ng ton, Kent u c ky 40506-0046 An extensive experimental investigation was conducted with activated carbon to establish the adsorption (equilibrium and kinetics) behavior of several metals from single and two metals systems in the presence of complexing agents. Triethylenetetramine (TRZEN) and EDTA were used as complexing agents. The extent of adsorption was found to be a function of metal and ligand types, ligand to metal ratio, p H , and metal chelate species distribution. Selective separation of valuable metals can also be achieved by the addition of complexing ligands to a mixture of strongly complexable metal (such as Cd2+ and Ni2+) and weakly complexable metal (such as Ba2+ and Ca2+).

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“…However, it was not possible to assess the full effect of these chelating agents because a large fraction of the cadmium(II) remained as free metal ions due to the use of low ligand‐to‐metal ratios. Jevtitch and Bhattacharyya16 and Bhattacharyya and Cheng17 reported comprehensive results on the adsorption of metal ions chelated by triethylenetetramine and EDTA on activated carbon. The extent of adsorption was found to be a function of metal and ligand types, ligand to metal ratio and solution pH.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of copper(II) and EDTA-chelated copper(II) onto granular activated carbons

Chu

Hashim

2000

J. Chem. Technol. Biotechnol.

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Waste streams generated by electroless copper plating in the printed circuit boards manufacturing industry often contain copper complexed by strong chelating agents such as EDTA. The consequence of metal complexation by chelating agents is that alternative treatment to chemical precipitation is often necessary to achieve the low metal concentrations required by increasingly stringent environmental regulations. This paper examines the feasibility of using activated carbon to remove EDTA-chelated copper(II) species as well as free copper(II) ions from aqueous solution. The adsorption characteristics of copper(II) and EDTA-chelated copper(II) on two granular activated carbons prepared from coal and coconut shell were evaluated. Adsorption equilibrium data of copper(II) on the two carbons corresponded well to the Langmuir model. The coconut shell-based carbon exhibited a greater adsorption capacity for copper(II) than the coal-based carbon under similar experimental conditions. Solution pH had a considerable in¯uence on copper(II) adsorption by the two carbons. Low adsorption levels of copper(II) at pH 3 and high adsorption levels in the pH range of 4±6 were observed. However, a reverse adsorption trend was observed when the chelating agent EDTA was added to the copper(II) solution. Adsorption of EDTA-chelated copper(II) by the two carbons was higher at pH 3 than at pH 6. The contrasting adsorption behaviour of copper(II) ions and EDTAchelated copper(II) species can be readily explained in terms of electrostatic interaction in that solution pH in¯uences the surface charge of the carbons as well as the charge property of copper(II) ions and EDTA-chelated copper(II) species.

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Separation of Heavy Metal Chelates by Activated Carbon: Effect of Surface and Species Charge

Cited by 26 publications

References 8 publications

A comprehensive review on Cd(II) removal from aqueous solution

A comprehensive review on Cd(II) removal from aqueous solution

Activated carbon adsorption of heavy metal chelates from single and multicomponent systems

Adsorption of copper(II) and EDTA-chelated copper(II) onto granular activated carbons

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