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- W2074889805 abstract "A study on the removal of cobalt ions from aqueous solutions by synthetic hydroxyapatite was conducted in batch conditions. The influence of different sorption parameters, such as: initial metal concentration, equilibration time, solution pH and presence of EDTA on the amount of Co2+ sorbed was studied and discussed. The sorption process followed pseudo-second-order kinetics with necessary time of 24 h to reach equilibrium. Cobalt uptake was quantitatively evaluated using the Langmuir and Dubinin–Kaganer–Radushkevich (DKR) model. The Langmuir adsorption isotherm constant corresponding to adsorption capacity, Xm, was found to be 20.92 mg/g. Sorption of Co2+ is constant in the initial pH range 4–8, because HAP surface buffers these solutions to the constant final pH value of 5.1. In the presence of EDTA, sorption of Co2+ decreases due to formation of complex with lower sorption affinities. Cobalt desorption depends on the composition of the extracting solution. The desorbed amount of cobalt decreased continuously with increasing pH, and increased with increasing Ca2+ concentration in leaching solution." @default.
- W2074889805 created "2016-06-24" @default.
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- W2074889805 date "2006-07-01" @default.
- W2074889805 modified "2023-09-25" @default.
- W2074889805 title "Removal of Co2+ from aqueous solutions by hydroxyapatite" @default.
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- W2074889805 doi "https://doi.org/10.1016/j.watres.2006.04.031" @default.
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