Chemistry and Mechanism of Alizarin Red S and Methylene Blue Biosorption onto Olive Stone: Equilibrium and Kinetic

Ahmad B. Albadarin, Chirangano Mangwandi

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Abstract

The biosorption process of anionic dye Alizarin Red S (ARS) and cationic dye methylene blue (MB) as a function of solution pH, initial concentration and contact time onto olive stone (OS) biomass has been investigated. The main objectives of the current study are to: (i) study the chemistry and the mechanism of ARS and MB biosorption onto olive stone and the type of OS–ARS, MB interactions occurring, (ii) study the biosorption equilibrium and kinetic experimental data required for the design and operation of column reactors. Equilibrium biosorption isotherms and kinetics were also examined. Experimental equilibrium data were fitted to four different isotherms by non-linear regression method, however, the biosorption experimental data for ARS and MB dyes were well interpreted by the Temkin and Langmuir isotherms, respectively. The maximum monolayer adsorption capacity for ARS and MB dyes were 109.0 and 102.6 mg/g, respectively. The kinetic data of the two dyes could be better described by the pseudo second-order model. The data showed that olive stone can be effectively used for removing dyes from wastewater.
Original languageEnglish
Number of pages5
Publication statusPublished - Mar 2015
EventThe Third Internation Conference on Water, Energy and Environment (ICWEE) - American University of Sharjah, Sharjah, United Arab Emirates
Duration: 24 Mar 201526 Mar 2015

Conference

ConferenceThe Third Internation Conference on Water, Energy and Environment (ICWEE)
CountryUnited Arab Emirates
CitySharjah
Period24/03/201526/03/2015

Keywords

  • anionic dye Alizarin
  • cationic dye methylene blue
  • biosorption
  • olive stone

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