Separation of heavy metal chelates by activated carbon: Effect of surface and species charge

M. M. Jevtitch; D. Bhattacharyya

doi:10.1080/00986448308940474

Separation of heavy metal chelates by activated carbon: Effect of surface and species charge

M. M. Jevtitch, D. Bhattacharyya

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

An extensive experimental Investigation was conducted with activated carbons to establish the adsorption capacities of heavy metals (Cd²⁺, Ni²⁺, Cu²⁺, and Zn²⁺) in the presence of complexing agents (EDTA, triethylenetetramine (TRIEN), citrate, etc.). Adsorption equilibria are explained by species charges and carbon surface charge characteristics. In the pH range 7.5—8.0, the active sites are positively charged. The adsorption capacities of Cd²⁺ (and other heavy metals), free ligands, and cadmium-ligands are also a function of feed metal concentration, types of ligands, molar ratio of ligand/metal, and pH. Complete metal-ligand species distributions are calculated by computer solutions of multiple reaction equilibria. For an equilibrium cadmium concentration of 0.1 mM (pH 7.5-8.0), the sequence in adsorption capacity for cadmium chelates is Q_cd-EDTA > Q_cd-chrate > Q_cd-TRIEN > Q_cd-tartrate. A relationship between the adsorption capacity, surface charge of activated carbon, and the average species charge for various cadmium ligands systems is presented.

Original language	English
Pages (from-to)	191-213
Number of pages	23
Journal	Chemical Engineering Communications
Volume	23
Issue number	4-6
DOIs	https://doi.org/10.1080/00986448308940474
State	Published - Nov 1 1983

Bibliographical note

Funding Information:
This research was supported in part by the U.S. Environmental Protection Agency Grant CR-80 7760 and a graduate fellowship (to M. Jevtitch) from the Rotary Foundation. The authors gratefully acknowledge the valuable contributions of Alfred B. Craig, Jr. of the U.S. EPA.

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering

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10.1080/00986448308940474

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title = "Separation of heavy metal chelates by activated carbon: Effect of surface and species charge",

abstract = "An extensive experimental Investigation was conducted with activated carbons to establish the adsorption capacities of heavy metals (Cd2+, Ni2+, Cu2+, and Zn2+) in the presence of complexing agents (EDTA, triethylenetetramine (TRIEN), citrate, etc.). Adsorption equilibria are explained by species charges and carbon surface charge characteristics. In the pH range 7.5—8.0, the active sites are positively charged. The adsorption capacities of Cd2+ (and other heavy metals), free ligands, and cadmium-ligands are also a function of feed metal concentration, types of ligands, molar ratio of ligand/metal, and pH. Complete metal-ligand species distributions are calculated by computer solutions of multiple reaction equilibria. For an equilibrium cadmium concentration of 0.1 mM (pH 7.5-8.0), the sequence in adsorption capacity for cadmium chelates is Qcd-EDTA > Qcd-chrate > Qcd-TRIEN > Qcd-tartrate. A relationship between the adsorption capacity, surface charge of activated carbon, and the average species charge for various cadmium ligands systems is presented.",

author = "Jevtitch, {M. M.} and D. Bhattacharyya",

note = "Funding Information: This research was supported in part by the U.S. Environmental Protection Agency Grant CR-80 7760 and a graduate fellowship (to M. Jevtitch) from the Rotary Foundation. The authors gratefully acknowledge the valuable contributions of Alfred B. Craig, Jr. of the U.S. EPA.",

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PY - 1983/11/1

Y1 - 1983/11/1

N2 - An extensive experimental Investigation was conducted with activated carbons to establish the adsorption capacities of heavy metals (Cd2+, Ni2+, Cu2+, and Zn2+) in the presence of complexing agents (EDTA, triethylenetetramine (TRIEN), citrate, etc.). Adsorption equilibria are explained by species charges and carbon surface charge characteristics. In the pH range 7.5—8.0, the active sites are positively charged. The adsorption capacities of Cd2+ (and other heavy metals), free ligands, and cadmium-ligands are also a function of feed metal concentration, types of ligands, molar ratio of ligand/metal, and pH. Complete metal-ligand species distributions are calculated by computer solutions of multiple reaction equilibria. For an equilibrium cadmium concentration of 0.1 mM (pH 7.5-8.0), the sequence in adsorption capacity for cadmium chelates is Qcd-EDTA > Qcd-chrate > Qcd-TRIEN > Qcd-tartrate. A relationship between the adsorption capacity, surface charge of activated carbon, and the average species charge for various cadmium ligands systems is presented.

AB - An extensive experimental Investigation was conducted with activated carbons to establish the adsorption capacities of heavy metals (Cd2+, Ni2+, Cu2+, and Zn2+) in the presence of complexing agents (EDTA, triethylenetetramine (TRIEN), citrate, etc.). Adsorption equilibria are explained by species charges and carbon surface charge characteristics. In the pH range 7.5—8.0, the active sites are positively charged. The adsorption capacities of Cd2+ (and other heavy metals), free ligands, and cadmium-ligands are also a function of feed metal concentration, types of ligands, molar ratio of ligand/metal, and pH. Complete metal-ligand species distributions are calculated by computer solutions of multiple reaction equilibria. For an equilibrium cadmium concentration of 0.1 mM (pH 7.5-8.0), the sequence in adsorption capacity for cadmium chelates is Qcd-EDTA > Qcd-chrate > Qcd-TRIEN > Qcd-tartrate. A relationship between the adsorption capacity, surface charge of activated carbon, and the average species charge for various cadmium ligands systems is presented.

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Separation of heavy metal chelates by activated carbon: Effect of surface and species charge

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