Adsorption Potential of Lead(II) Ions from Aqueous Solutions onto Capsicum annuum Seeds

The purpose of this work was to evaluate the adsorption potential of Capsicum annuum seeds, in a batch system for the removal of lead(II) ions from aqueous solutions. The experimental results showed that this agricultural by-product was effective in removing lead(II) ions. The FT-IR analysis indicat...

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Bibliographic Details
Published in:Separation science and technology 2007-01, Vol.42 (1), p.137-151
Main Authors: Özcan, A. Safa, Özcan, Adnan, Tunali, Sibel, Akar, Tamer, Kiran, Ismail, Gedikbey, Tevfik
Format: Article
Language:English
Subjects:
adsorption
Agricultural by-products
Capsicum annuum seeds
heavy metals
isotherm
kinetics
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Summary:The purpose of this work was to evaluate the adsorption potential of Capsicum annuum seeds, in a batch system for the removal of lead(II) ions from aqueous solutions. The experimental results showed that this agricultural by-product was effective in removing lead(II) ions. The FT-IR analysis indicated that the mechanism involved in adsorption of lead(II) ions by seeds of C. annuum was mainly attributed to lead(II) binding of amino and hydroxyl groups. Adsorption equilibrium approached within 40 min. The adsorption data fitted well to the Langmuir isotherm model. The maximum adsorption capacity (q max ) was 1.87×10 −4  mol g −1 . Pseudo-second-order kinetic model was applicable to all the adsorption data over the entire time range. The thermodynamic parameters indicated that the adsorption process is spontaneous since Gibbs free energy values are negative, which are between −26.92 and −30.77 kJ mol −1 at the temperature range of 20-50°C.
ISSN:0149-6395
1520-5754
DOI:10.1080/01496390600956977