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Abstract
Adsorption of fluoride was studied batch wise from aqueous solution by using zirconium(IV)-loaded orange waste gel to achieve practical utility and evaluate the viability of the adsorption gel. Fluoride adsorption was found to be dependent on solution pH and the maximum adsorption of fluoride was observed at pH 2–4. The maximum sorption capacity of the gel for fluoride was evaluated as 1.2 mmol/g, which was compared to that of zirconium(IV)-loaded Amberlite 200CT, a strongly acidic cation exchange resin, which was only 0.5 mmol/g in applied experimental condition. The influence of high concentration of co-existing anions on adsorption of fluoride was studied to evaluate selectivity and competitiveness of fluoride adsorption. The presence of foreign anions such as Cl−, ,
, and
had no significant effect on fluoride adsorption of the present gel. Adsorption of fluoride from actual waste plating solution was also carried out, suggesting very effective adsorption at a solid/liquid ratio greater than 4 g/dm3. Repeated use of the gel was also successfully examined over ten cycles of adsorption-elution-regeneration without any degradation of the gel. These results suggest that the modified orange waste gel is a promising candidate for fluoride adsorption from aqueous solution.
ACKNOWLEDGEMENTS
The present work was financially supported by New Energy and Industrial Development Technology Organization (NEDO) for the project on Water-saving Recycling Systems.
