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Abstract

Caladium bicolour is a stubborn weed in farmlands while eggshell biomass is an agricultural waste of no economic importance. Batch sorption of metanil yellow on the biomasses was carried out with a view to determine the effect of nature of sorbents. Effects of initial dye concentration, initial pH and sorbent dosage were investigated. Experimental results were analyzed with three isotherms and three kinetic models. The Boyd model was used to determine the rate-determining step. The Caladium bicolour corm contains functional  groups while eggshell contains pores. The highest sorption capacities were 3.995 and 1.385 mg/g for Caladium bicolour and eggshell, respectively; the optimum pH was 5. Sorption decreased with increase in initial concentration for Caladium bicolour, while for eggshell sorption increased with increase in initial concentration. The isotherm and kinetic models applied were good fits. The sorption was controlled by liquid film diffusion. Sorption on Caladium bicolour was more than twice that of eggshell. However, the sorptions on both sorbents were low.

Keywords

Batch sorption Eggshell Caladium bicolour Metanil yellow

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Copyright (c) 2018 Beniah O. Isiuku, Ozioma U. Akakuru, Festus Emengaha, Benjamin I. Nwabueze

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