Equilibrium and kinetic studies on biosorption of Hg(II), Cd(II) and Pb(II) ions onto microalgae Chlamydomonas reinhardtii

Yükleniyor...
Küçük Resim

Tarih

2005

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

Academic Press Ltd- Elsevier Science Ltd

Erişim Hakkı

info:eu-repo/semantics/closedAccess

Özet

The microalgae Chlamydomonas reinhardtii was used for the biosorption of Hg(II), Cd(II) and Pb(II) ions. The maximum adsorption of Hg(II) and Cd(II) ions on Chlamydomonas reinhardtii biomass was observed at pH 6.0 and the corresponding value for Pb(II) ions was 5.0. The biosorption of Hg(II), Cd(II) and Pb(II) ions by microalgae biomass increased as the initial concentration of Hg(II), Cd(II) and Pb(II) ions increased in the biosorption medium. The maximum biosorption capacities of microalgae for Hg(II), Cd(II) and Pb(II) ions were 72.2 +/- 0.67, 42.6 +/- 0.54 and 96.3 +/- 0.86 mg/g dry biomass, respectively. The affinity order for algal biomass was Pb(II) > Hg(II) > Cd(II). FT-IR analysis of algal biomass revealed the presence of amino, carboxyl, hydroxyl and carbonyl groups, which were responsible for biosorption of metal ions. Biosorption equilibrium was established in about 60 min and the equilibrium was well described by the Freundlich biosorption isotherms. Temperature change in the range of 5 - 35 degrees C did not affect the biosorption capacity. The microalgae could be regenerated using 0.1 M HCl, with up to 98% recovery, which allowed the reuse of the biomass in six biosorption-desorption cycles without any considerable loss of biosorption capacity. (c) 2005 Elsevier Ltd. All rights reserved.

Açıklama

Anahtar Kelimeler

Chlamydomonos reinhardtii, algae, biosorption, kinetic characterization, Hg(II), Cd(II), Pb(II), heavy metal, FT-IR

Kaynak

Journal Of Environmental Management

WoS Q Değeri

Q2

Scopus Q Değeri

Q1

Cilt

77

Sayı

2

Künye

closedAccess