Volume 47, Issue 3, January 2006, Pages 113–118

Adsorption of Cu(II), Cd(II), Zn(II), Mn(II) and Fe(III) ions by tannic acid immobilised activated carbon

A. Üçer,
A. Uyanik^,,
Ş.F. Aygün

Ondokuz Mayıs University, Department of Chemistry, 55139 Kurupelit, Samsun, Turkey

Received 1 February 2005. Revised 14 June 2005. Accepted 23 June 2005. Available online 11 August 2005.

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Abstract

In this study, adsorption of the toxic metal ions onto tannic acid immobilised activated carbon was investigated depending on pH, contact time, carbon dosage, adsorption capacity and adsorption isotherms by employing batch adsorption technique. In the optimum conditions, the percent adsorption of metal ions were determined for Cu(II) (23.5%), Cd(II) (17.8%), Zn(II) (14.0%), Mn(II) (11.3%) and Fe(III) (17.9%) and results were compared with that of the untreated activated carbon. The order of affinity based on uptake by tannic acid immobilised activated carbon and untreated activated carbon was the same as Cu(II) > Fe(III) > Cd(II) > Zn(II) > Mn(II), but differing in the adsorption capacities. In the studied conditions, the adsorption capacity of tannic acid immobilised activated carbon followed the order of Cu(2.23) > Fe(1.77) > Cd(1.51) > Zn(1.23) > Mn(1.13) in single systems and Fe(1.56) > Cd(1.48) > Zn(1.19) > Mn(1.11) in Cu(II) coupled competitive systems. The adsorption data was correlated to Langmuir and Freundlich isotherm for each metal ion and the data fitted better to the Langmuir isotherm model. A combined ion exchange, complex formation and surface adsorption processes were believed the major adsorption mechanisms playing role in the binding of metal ions. Adsorbed metal ions were effectively desorbed (90.2–98.4%) by using 0.1 M HCl without destroying the modified adsorbent.

Keywords

Adsorption;
Immobilisation;
Modification;
Heavy metal ions;
Activated carbon;
Tannic acid

Figures and tables from this article:

: Fig. 1. Adsorption of Cu(II) ions by Whatman 44, blue band ashless filter paper.; View Within Article

: Fig. 2. Effect of pH on adsorption: (a) on tannic acid modified activated carbon (TA-AC); and (b) untreated activated carbon (AC).; View Within Article

: Fig. 3. Effect of contact time on the adsorption of metal ions on tannic acid modified activated carbon (TA-AC).; View Within Article

: Fig. 4. Effect of on tannic acid modified activated carbon (TA-AC) dosage on the adsorption of metal ions.; View Within Article

: Fig. 5. Langmuir isotherm plots for the adsorption of metal ions on tannic acid modified activated carbon.; View Within Article

Table 1. Optimum experimental conditions and percent adsorption values for metal ions

(1): For untreated activated carbon, (2): for tannic acid immobilised activated carbon.

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Table 2. Adsorption capacities of tannic acid immobilised activated carbon for single and binary metal ions at optimum pH values

x/m₁ and x/m₂ adsorption capacities for metal ions in single and binary systems, respectively.

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Table 3. Langmuir and Freundlich data for metal ions on tannic acid immobilised activated carbon

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Table 4. Desorption data for metal ions (% recovery)

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Table 5. Previously reported adsorption capacities for various adsorbents for metal ion adsorptions

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: Corresponding author. Tel.: +90 362 4576020x5167; fax: +90 362 4576081.

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