Dried Orange Peel: A potential Bio sorbent for Removal of Cu (II) and Cd (II) Ions from Aqueous Solution

Abstract

Awash Yerga, Gashaw Nigussie, Yemane Werede, Fozia Ibrahim

Bio sorption is one of potential alternative conventional technologies for the removal of metal ions from aqueous solutions due to its low cost, high efficiency, minimization of chemical or biological sludge, regeneration of bio sorbents and possibility of metal recovery. Therefore the aim of this study was to study effect of operational parameters on dried orange peel:  a potential bio sorbent for removal of Cd (II) and Cu (II) ions from aqueous solution. Batch adsorption experiments were performed as a function of pH, contact time, solute concentration and adsorbent dose and the residual metal ion concentrations were determined using flame Atomic Absorption Spectrometer (FAAS).The results indicate that optimum conditions for copper (II) and cadmium (II) adsorption were achieved with contact time of 120 minutes and dose of orange peel 2 g at pH 2 and 6 respectively. The orange peel yielded a maximum adsorption efficiency of 99.23% for copper (II) ion and 97.75% for cadmium (II). The fitness of the bio sorption data for Langmuir and Freundlich adsorption models was investigated and the calculated equilibrium data fitted well to both Langmuir with correlation coefficient (R2) of 0.988 for Copper (II) and 0.979 for cadmium (II) ion and Freundlich with correlation coefficient (R2) of 0.995 for copper (II) ion and 0.998 for cadmium (II) ion. The maximum adsorption capacity (qmax) of orange peel was found to be 4.15 mg/g for copper (II) ion and 2.45 mg/g for cadmium (II) ion.

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