Abstract
Studies on the removal of cadmium(II) ions from aqueous solutions by adsorption on various activated carbons [commercial activated carbon (CAC) and chemically prepared activated carbons (CPACs) from raw materials such as straw, saw dust and datesnut] have been carried out with an aim to obtain information on treating effluents containing Cd(II) ions. Factors influencing the adsorption of Cd(II) ions from aqueous solution by ACs have been investigated by following a batch adsorption technique at 30± 1 ∘C. The percentage removal increased with decrease in initial concentration and particle size of CPACs and an increase in contact time, dose and initial pH of the solution. Adsorption process was inhibited by the added electrolytes. The adsorption data were fitted with the Langmuir, Dubinim–Radushkevich and Freundlich isotherms and first-order kinetic equations viz., first-order, Lagergren and Bhattacharya–Venkobachar equations and intra-particle diffusion model. The kinetics of adsorption is first order with intra-particle diffusion as one of the rate determining steps. Thermodynamic parameters were obtained from equilibrium constants measured at 30, 35 and 40 ∘C (Error = ± 1 ∘C). Results of the studies on adsorption of Cd2+ ions from simulated wastewater were compared with that of CAC and Tulsion CXO-9(H), a commercial ion exchange resin/cationic resin (CR). Straw carbon showed the maximum adsorption capacity towards Cd2+ ions and a high value of rate constant of adsorption. Straw carbon is an alternative low-cost adsorbent to CAC.
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Kannan, N., Rengasamy, G. Comparison of Cadmium Ion Adsorption on Various ACTIVATED CARBONS. Water Air Soil Pollut 163, 185–201 (2005). https://doi.org/10.1007/s11270-005-0277-y
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DOI: https://doi.org/10.1007/s11270-005-0277-y