Heavy metals removal from synthetic wastewater by a novel nano-size composite adsorbent |
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Authors: | Y. B. Onundi M.Sc. A. A. Mamun Ph.D. M. F. Al Khatib Ph.D. M. A. Al Saadi M.Sc. A. M. Suleyman Ph.D. |
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Affiliation: | 1. Bioenvironmental Engineering Research Unit, Department ofBiotechnology Engineering, Faculty of Engineering International Islamic University Malaysia Gombak, 53100, Kuala Lumpur, Malaysia
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Abstract: | The effects of varying operating conditions on metals removal from aqueous solution using a novel nano-size composite adsorbent are reported in this paper. Characterization of the composite adsorbent material showed successful production of carbon nanotubes on granular activated carbon using 1 % nickel as catalyst. In the laboratory adsorption experiment, initial mixed metals concentration of 2.0 mg/L Cu2+, 1.5 mg/L Pb2+ and 0.8 mg/L Ni2+ were synthesized based on metals concentration from samples collected from a semiconductor industry effluent. The effects of operation conditions on metals removal using composite adsorbent were investigated. Experimental conditions resulting in optimal metals adsorption were observed at pH 5, 1 g/L dosage and 60 min contact time. It was noted that the percentage of metals removal at the equilibrium condition varied for each metal, with lead recording 99 %, copper 61 % and nickel 20 %, giving metal affinity trend of Pb2+ > Cu2+ > Ni2+ on the adsorbent. Langmuir’s adsorption isotherm model gave a higher R2 value of 0.93, 0.89 and 0.986 for copper, nickel and lead, respectively, over that of Freundlich model during the adsorption process of the three metals in matrix solution. |
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