Sorption models and sorption capacities of tuber wastes for Cadmium (11) ion were investigated. The results showed that more than ninety-five per cent of initial concentration of Cadmium (11) ion in the aqueous solution was sorbed by each of these tuber wastes. The results obtained from the modelling of the results of sorption studies using Langmuir and Dubinin -Radushkevich models showed that the maximum sorption capacity (Qmax) obtained is thus yam peels> sweet potato peels > cassava peels .The calculated porosity values (Qd) l/g showed yam peels > sweet potato peels > cassava peels. The calculated sorption energy E, showed the trend thus sweet potato peels > cassava peels > yam peels .The Langmuir constant obtained showed closely related values for the three tuber waste studied.

Sorption models and sorption capacities of common edible fruit wastes for Cadmium (11) ion was investigated. The results of sorption studies showed that each of these common edible fruit waste sorbed more than ninety-six per cent of the Cadmium (11) ions from the aqueous solution. The results of the modelled isotherm equations namely Langmuir and Dubinin-Radushkevich showed that the maximum sorption capacity of each of these edible fruit wastes for Cadmium (11) ion Qmax l/g orange peels was great than that of the banana peels. The calculated energy value E banana peels was great than that of the orange peels. Also the calculated porosity value Q D g/l banana peels was the great than that of the orange. The calculated Langmuir constant for the two edible fruit wastes was very close to unity.

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