Removal of lead ions by acid activated and manganese oxide-coated bentonite

Eren E., Afsin B., ÖNAL Y.

JOURNAL OF HAZARDOUS MATERIALS, vol.161, no.2-3, pp.677-685, 2009 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 161 Issue: 2-3
  • Publication Date: 2009
  • Doi Number: 10.1016/j.jhazmat.2008.04.020
  • Journal Name: JOURNAL OF HAZARDOUS MATERIALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.677-685
  • Keywords: Bentonite, Adsorption, Thermodynamic, Manganese oxide, Lead, AQUEOUS-SOLUTION, ADSORPTION CHARACTERISTICS, MX-80 BENTONITE, PB(II), THERMODYNAMICS, EXCHANGE, CU2+, NI2+, IR, MONTMORILLONITE
  • Ondokuz Mayıs University Affiliated: Yes

Abstract

This paper presents the adsorption of Pb(II) from aqua solutions onto Unye (Turkey) bentonite in raw (RB), acid activated (AAB) and manganese oxide-coated (MCB) forms. Adsorption of Pb(H) by RB, AAB and MCB sample was investigated as a function of the initial Pb(II) concentration, solution pH, ionic strength, temperature and inorganic ligand (Cl-). Changes in the surfaces and structure were characterized by means of XRD, IR and potentiometric titration. The Langmuir monolayer adsorption capacities of RB, AAB and MCB in 0.1 M KNO3 solution were estimated as 16.70, 8.92 and 58.88 mg/g, respectively. The spontaneity of the adsorption process is established by decrease in Delta G which varied from -21.60 to -28.60kJ/mol (RB), -22.63 to -29.98 kJ/moI (AAB) and -19.57 to -26.22 (MCB) in temperature range 303-338 K. (C) 2008 Elsevier B.V. All rights reserved.