Mechanism of Alizarin Red S and Methylene Blue Biosorption onto Olive Stone: Isotherm study in Single and Binary Systems

Ahmad B. Albadarin*, Chirangano Mangwandi

*Corresponding author for this work

Research output: Contribution to journalArticle

60 Citations (Scopus)
538 Downloads (Pure)

Abstract

The biosorption process of anionic dye Alizarin Red S (ARS) and cationic dye methylene blue (MB) as a function of contact time, initial concentration and solution pH onto olive stone (OS) biomass has been investigated. Equilibrium biosorption isotherms in single and binary systems and kinetics in batch mode were also examined. The kinetic data of the two dyes were better described by the pseudo second-order model. At low concentration, ARS dye appeared to follow a two-step diffusion process, while MB dye followed a three-step diffusion process. The biosorption experimental data for ARS and MB dyes were well suited to the Redlich-Peterson isotherm. The maximum biosorption of ARS dye, qmax = 16.10 mg/g, was obtained at pH 3.28 and the maximum biosorption of MB dye, qmax = 13.20 mg/g, was observed at basic pH values. In the binary system, it was indicated that the MB dye diffuses firstly inside the biosorbent particle and occupies the biosorption sites forming a monodentate complex and then the ARS dye enters and can only bind to untaken sites; forms a tridentate complex with OS active sites.
Original languageEnglish
Pages (from-to)86-93
Number of pages8
JournalJournal of Environmental Management
Volume164
Early online date07 Sep 2015
DOIs
Publication statusPublished - 01 Dec 2015

Keywords

  • biosorption
  • ADSORPTION
  • Methylene blue

Fingerprint Dive into the research topics of 'Mechanism of Alizarin Red S and Methylene Blue Biosorption onto Olive Stone: Isotherm study in Single and Binary Systems'. Together they form a unique fingerprint.

  • Cite this