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Acid Black 172 dye adsorption from aqueous solution by hydroxyapatite as low-cost adsorbent
Gabriela Ciobanu,Maria Harja,Lacramioara Rusu,Anca Mihaela Mocanu,Constantin Luca 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.6
The Acid Black 172 dye adsorption on the uncalcined hydroxyapatite nanopowder was investigated. Thehydroxyapatite prepared by wet coprecipitation method has high specific surface area of 325 m2/g and crystal sizessmaller than 70 nm. The batch adsorption experiments revealed that under the optimum adsorption conditions (pH 3,hydroxyapatite dosage 2 g/L, initial dye concentration 400 mg/L and temperature 20 oC) the dye removal efficiencywas 95.78% after 1 h of adsorption. The adsorption kinetics was best described by the pseudo-second order kineticmodel. The intraparticle diffusion model shows that intraparticle diffusion is not the sole rate-limiting step; the masstransfer also influences the adsorption process in its initial period. The Langmuir isotherm model best represented theequilibrium experimental data, and the maximum adsorption capacity (qm) was 312.5 mg/g.