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Effect of Metal Ion Concentration on the Biosorption of Al3+ and Cr6+ by Almond Tree (Terminalia catappa L.) Leaves

Author Affiliations

  • 1 Department of Chemistry, Delta State University, Abraka, Delta State, NIGERIA
  • 2Department of Chemistry, University of Portharcourt, River State, NIGERIA

Res.J.chem.sci., Volume 3, Issue (11), Pages 1-6, November,18 (2013)


The influence of initial metal ion concentration of the batch sorption of Al3+ and Cr6+ onto a low-cost biosorbent was investigated. The experimental results were analysed in terms of Langmuir and Freundlich isotherms. According to the evaluation using Langmuir equation, the monolayer sorption capacity obtained were 1.12mg/g and 2.67mg/g for Al3+ and Cr6+ respectively. The data further showed that sorption of the two metals onto the biomass increased with increase in initial metal ion concentration. The thermodynamic assessment of the metal ion almond tree (Terminalia catappa L. biomass system indicates the feasibility and spontaneous nature of the process. ΔG was evaluated as ranging from -4.56 to 6.64 KJ mol-1 and 4.03 to -6.10 KJ mol-1 for Al3+ and Cr6+ sorption respectively. The order of magnitude of the ΔG values indicates an ion exchange physiosorption process.


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