Adsorption potential of lead(II) ions from aqueous solutions onto Capsicum annuum seeds

Ozcan A. S., Ozcan A., Tunali S., AKAR T., KIRAN İ., Gedikbey T.

Separation Science and Technology, vol.42, no.1, pp.137-151, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 42 Issue: 1
  • Publication Date: 2007
  • Doi Number: 10.1080/01496390600956977
  • Journal Name: Separation Science and Technology
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.137-151
  • Keywords: agricultural by-products, adsorption, heavy metals, isotherm, kinetics, Capsicum annuum seeds, HEAVY-METALS, REMOVAL, BIOSORPTION, BIOMASS, EQUILIBRIUM, COPPER(II), BIOSORBENT, KINETICS, PB(II), BLUE
  • Eskisehir Osmangazi University Affiliated: Yes

Abstract

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 (qmax) 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.