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Sorption Studies on the Use of African Breadfruit (Treculia Africana) Seed Hull as Adsorbent for the Removal of Cu2+, Cd2+ and Pb2+ from Aqueous Solutions.
American Journal of Physical Chemistry
Volume 1, Issue 1, December 2012, Pages: 11-21
Received: Dec. 22, 2012; Published: Dec. 30, 2012
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Christopher Uchechukwu Sonde, Department of Chemistry, Michael Okpara University of Agriculture, Umudike, Umuahia, Abia State, Nigeria
Stevens Azubuike Odoemelam, Department of Chemistry, Michael Okpara University of Agriculture, Umudike, Umuahia, Abia State, Nigeria
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The sorption of Cu2+, Cd2+ and Pb2+ from aqueous solutions by unmodified (UBSH) and modified (MBSH) African breadfruit (Treculia africana) seed hull has been investigated. The amount of ions adsorbed by the hulls was dependent on the contact time range, 10 min – 120 min at optimum pH, 7.5 and temperature, 30 oC. Results revealed that the amount of metal ions adsorbed increased with time for both UBSH and MBSH, as well as a slight drop in the amount of Cd2+ adsorbed between contact time 60 min and 90 min for only UBSH. The rate of removal of the metal ions from their solutions was rapid, as appreciable amounts (96 % – 99 %) were adsorbed by the adsorbents at the least contact time (10 min) of the experiment. However, sorption capacity trend of the metal ions was Pb2+ > Cd2+ > Cu2+ for both UBSH and MBSH. Modification by thiolation of the adsorbent showed enhancement mainly in the sorption of Cu2+ and Cd2+ and a reduction for Pb2+ due to low affinity of Pb2+ for –SH groups. A comparison of kinetic models applied to the sorption process was evaluated for Pseudo-first order and Pseudo-second order models, with Pseudo-second order providing a better fit to the experimental data with high R2 values ranging 0.9999 to 1. McKay & Poot intraparticle diffusion model also pro-vided a good fit to the experimental data with more R2 values close to 1 than Weber & Morris model, thus suggesting the sorption process to be intraparticle diffusion controlled. Generally, the results from this study, indicates that a good adsor-bent can be obtained from both unmodified and thioglycollic acid-modified breadfruit seed hull.
African Breadfruit Seed Hull; Aqueous Solution; Intraparticle Diffusion; Kinetics; Metal Ions; Sorption; Thiolation
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Christopher Uchechukwu Sonde, Stevens Azubuike Odoemelam, Sorption Studies on the Use of African Breadfruit (Treculia Africana) Seed Hull as Adsorbent for the Removal of Cu2+, Cd2+ and Pb2+ from Aqueous Solutions., American Journal of Physical Chemistry. Vol. 1, No. 1, 2012, pp. 11-21. doi: 10.11648/j.ajpc.20120101.12
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