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Studies on the effect of pH on the sorption of Al3 and Cr6 Ions from aqueous solutions by Almond Tree (Terminalia catappa L.) Biomass

Author Affiliations

  • 1Department of Chemistry, Delta State University, P. M. B 1, Abraka, Delta State, NIGERIA

Res.J.chem.sci., Volume 2, Issue (4), Pages 13-17, April,18 (2012)


Environmental protection requires the use of natural products instead of chemicals to minimize pollution. This investigation studies the use of a non-useful plant material as naturally occurring biosorbents for the removal of cationic pollutants in wastewater. The effect of pH on the sorption of Al3+ and Cr6+ ion unto Terminalia catappa biomass was investigated. The experimental results have been analysed in terms of Langmuir and Freundlich isotherms. The data showed that the maximum pH (pH max) for efficient sorption of Al3+ was 4.0 (85.5 mg/g) and for 6+ 2.0 (82.6 mg/g). Evaluation using Langmuir equation gave the monolayer sorption capacity as 1.12mg/g and 2.67mg/g at the respective pHmax for Al3+ and Cr6+. The thermodynamic assessment of the metal ion – Terminalia catappa L. biomass system indicates the feasibility and spontaneous nature of the process.


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