Biosorption of binary mixtures of heavy metals by Medicago sativa

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Abstract

An experiment was conducted to study the adsorption capacity of Medicago sativa biomass for selected metals as copper (Cu +2), cadmium (Cd +2), cobalt (Co +2) and iron (Fe +2) in a single and binary system as well. Results indicated that the adsorption capacity of selected biomass for the binary mixture was always lower than that for the single component system. The adsorption isotherm of selected metals on Medicago sativa in a single system was tested using two isotherm models. Both the Langmuir and Freundlich models were suitable for describing adsorption process with a better fit with Freundlich model. The adsorption of binary mixture of selected metals onto the surface of the Medicago sativa was found to be of competitive type whereas the adsorption capacity for each single metal decreased by 10-40% in the presence of the others. The removal percentage of selected metals on Medicago sativa biomass was in the order of Fe +2 > Cu +2 > Co +2 > Cd +2 in both single and binary systems with antagonistic relationship between Fe +2 and other selected metals. It was concluded that the interactions betweem metals in mixture may be of importance as the antagonistic interactions contribute negatively to the accumulation of heavy metals in waste water discharges. That is of great concern in the design of adsorption system in real wastewater treatment plant.

Original languageEnglish
Pages (from-to)465-473
Number of pages9
JournalWorld Applied Sciences Journal
Volume16
Issue number3
Publication statusPublished - 31 Jan 2012

Fingerprint

Biosorption
Heavy Metals
Binary mixtures
Metals
Adsorption
Biomass
Cobalt
Cadmium
Adsorption isotherms
Wastewater treatment
Isotherms
Copper
Wastewater
Iron

Keywords

  • Adsorption
  • Competitive sorption
  • Medicago sativa
  • Wastewater treatment

Cite this

Al-Qahtani, K. M. (2012). Biosorption of binary mixtures of heavy metals by Medicago sativa. World Applied Sciences Journal, 16(3), 465-473.
Al-Qahtani, Khairia M. / Biosorption of binary mixtures of heavy metals by Medicago sativa. In: World Applied Sciences Journal. 2012 ; Vol. 16, No. 3. pp. 465-473.
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Al-Qahtani, KM 2012, 'Biosorption of binary mixtures of heavy metals by Medicago sativa', World Applied Sciences Journal, vol. 16, no. 3, pp. 465-473.

Biosorption of binary mixtures of heavy metals by Medicago sativa. / Al-Qahtani, Khairia M.

In: World Applied Sciences Journal, Vol. 16, No. 3, 31.01.2012, p. 465-473.

Research output: Contribution to journalArticleResearchpeer-review

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Al-Qahtani KM. Biosorption of binary mixtures of heavy metals by Medicago sativa. World Applied Sciences Journal. 2012 Jan 31;16(3):465-473.