FUW TRENDS IN SCIENCE & TECHNOLOGY JOURNAL
(A Peer Review Journal)
e–ISSN: 2408–5162; p–ISSN: 2048–5170
keywords: Nymphaea ampla, cadmium, lead, adsorption isotherm, thermodynamic, AAS
Activated carbon prepared from Nymphaea ampla roots by chemical activation using ZnCl2 was used for removal of Cd2+ and Pb2+ ions from aqueous solutions. The adsorbent samples were characterized for some physicochemical parameters. FTIR spectroscopic analysis was also carried out for functional group characterization. The percentage carbon yield and pH of the aqueous suspension of the sample was found to be 30.0±0.2% and 6.4±0.1, respectively. Its percent burn off, attrition, bulk density, iodine number surface area and normal moisture content were 6.3±0.2%, 14%, 260±1.0 kg/m3, 335.02 mg/g, 254.4 m2/g and 5%, respectively. The FTIR results indicated that –OH, –NH, C=N and –COO- were candidate functional groups responsible for the binding of metal ions, with high removal efficiency of 91.3% and 88.8% for Cd2+ and Pb2+ ions, respectively. The kinetic data fitted better to pseudo-second order with good correlation and low sum of error squares (SSE) compared to pseudo-first order kinetics for the adsorption of both metal ions. Thermodynamic experiments indicated that the adsorption process was feasible, spontaneous and exothermic. The results indicated that the adsorbent can be used as an effective and low-cost material for the removal of toxic metal ions from aqueous media like industrial effluents.
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