Removal of copper ions by modified sepiolite samples

Eren E., Eren B.

Desalination and Water Treatment, vol.20, no.1-3, pp.114-122, 2010 (SCI-Expanded, Scopus) identifier

  • Publication Type: Article / Article
  • Volume: 20 Issue: 1-3
  • Publication Date: 2010
  • Doi Number: 10.5004/dwt.2010.1186
  • Journal Name: Desalination and Water Treatment
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.114-122
  • Keywords: Adsorption, Clay, Copper ions, Sepiolite, Thermodynamic
  • Bilecik Şeyh Edebali University Affiliated: Yes

Abstract

This paper presents the adsorption of Cu(II) from aqueous solution by raw sepiolite (RS), manganese oxide coated sepiolite (MCS), and base activated sepiolite (BAS) samples. Adsorption of Cu(II) by sepiolite samples was investigated as a function of the initial Cu(II) concentration, solution pH, ionic strength, temperature and the presence of an inorganic ligand (Cl-). Changes in the surface and structure were characterized by means of XRD, IR and N2 gas adsorption data. The Langmuir monolayer adsorption capacities of RS, MCS and BAS in 0.1 M KNO3 solution were calculated to be 5.55, 6.70 and 13.46 mg/g, respectively. ΔG, ΔH and ΔS were determined as -18.94 kJ/mol (at 303 K), 25 kJ/mol and 145 J/mol K, -19.51 kJ/mol (at 303 K), 2 kJ/mol and 71 J/mol K and -20.51 kJ/mol (at 303 K), 31 kJ/mol and 170 J/mol K for RS, MCS, and BAS, respectively. © 2010 Desalination Publications.