Abstract: Chromium is an average toxic metal introduced into the ecosystem as a result of various industrial operations such as mining, smelting, surface finishing industry, energy and fuel production, fertilizer and pesticide, metallurgy, leather tanning, chromate preparation, etc. Chromium occurs in trivalent and hexavalent forms in aqueous solution/environment. Carcinogenic and mutagenic effects of Cr (VI) make it more toxic. Thus, biosorption of Cr (VI) ions from aqueous solution onto a low-cost adsorbent — Citrus limetta (Mousambi) peels — chemically modified peels (acid and alkaline treated peels) and raw peels were investigated to evaluate the batch parameters like effect of adsorbent dosage, initial chromium Cr(VI)) ion concentration, contact time, pH and temperature. Greater percentage of metal Cr(VI)) ion was removed with the increase in the amount of adsorbent used (Chemically modified and raw peels) and decrease in the initial concentration of Cr (VI) ion. The rate of adsorption is higher at a contact time of 96 h denoting the rate of uptake controlled by the rate at which the adsorbate is transported from exterior to the interior sites of biosorbent particles. Optimal pH value for Cr (VI) adsorption onto the chemically modified peels (alkaline and acid treated raw peels) was pH 10.0 and 2.0 for raw peels. Significant impact on biosorption of Cr (VI) ion was observed at a room temperature of 30¬–40˚C. The comparative efficiency of alkaline, acid treated and raw peels of Musambi in removal of toxic Cr (VI) from its synthetic solution in batch modes were studied in the treatment of tannery effluent. The Change in lattice structure of adsorbent before and after adsorption was analyzed by FTIR and SEM analysis.
Keywords: Cr (VI); batch parameters; adsorption; calorimeter; Fourier transform infrared spectroscopy; high resolution-scanning electron microscope imaging.
Title: Removal of Hexavalent Chromium from Aqueous Solution using Chemically-Modified Sweet Lime (Citrus limetta) Peels
Author: Dr. A. M. Sabitha Rani, R. Saroja Preethy
International Journal of Thesis Projects and Dissertations (IJTPD)
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