Influence of Dosage and Type of Red Mangrove Sorbent on the Adsorption of Chromium (VI) Ions in Aqueous Solution
Keywords:
Sulphuric acid, Adsorbent, Biomass, Freundlich, CapacityAbstract
To present the influence of dosage and type of red mangrove sorbent on adsorption of chromium [Cr] (vi) ion in aqueous solution, adsorption data of raw and sulphuric acid (H2SO4)-treated red mangrove biomass (leaves, bark and root) sorbents, obtained from a recent dissertation, was re-viewed, as function of dosage for raw and H2SO4-treated sorbents. The adsorption was influenced by the dosage and type of red mangrove sorbent. The lower the dosage applied the higher the adsorption capacity obtained. Also, H2SO4-treated red mangrove sorbent adsorbed Cr (vi) ion more than raw sorbent. Values of adsorption capacity recorded for raw sorbents were lower than those for H2SO4-treated sorbents, meaning raw red mangrove biomass was not as efficient as H2SO4-treated red mangrove biomass. Isothermic data indicate stronger Cr (vi) adsorption by H2SO4-treated sorbents than raw sorbents; fitted well with the Freundlich model for raw sorbents. Kinetic data indicate a high Cr (vi) adsorption rate by both H2SO4-treated and raw sorbents; showing the best correlation with the pseudo-second-order model, suggesting chemi-sorption for both sorbents. H2SO4-treated red mangrove leaves, bark, or root powder can be employed as an adsorbent for the treatment of Cr (vi) ion in aqueous solution.
References
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