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| Synthesis and defluoridation performance of humic acid sodium base absorbent modified by metal ion |
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Abstract Metal ion-modified humic acid sodium absorbent (devoted as MMNaA) had been developed to improve the removal efficiency of fluoride ion in aqueous solution by gel polymerization method using aluminum salt and calcium salt as raw materials. The crystal structures and microstructures of the materials were measured by XRD and SEM; and the adsorption performance of the materials for fluoride ion in aqueous solution was investigated by static adsorption experiment. The results showed that a good matching between the adsorption isotherm behavior of MMNaA and Langmuir equation was observed; the adsorption capacity of 208.77mg/g calculated from Langmuir equation was obtained; the adsorption process could be expressed as pseudo-second-order kinetic model; and the absorption rate was determined by the liquid film diffusion and the intra-particle diffusion. Maximum fluoride adsorption of MMNaA in contaminated water was reached at the pH values of 5~9.As compared with γ-Al2O3, MMNaA had a much wider range of pH, less dose and shorter absorption time.
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Received: 07 August 2013
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