ADSORPTIVE REMOVAL OF FLUORIDE FROM AQUEOUS SOLUTION USING ZrO_2 SUPPORTED ON MULTIWALL CARBON NANOTUBE

ZrO2 supported on multiwall carbon nanotube(ZrO2-MWCT) was prepared,and its adsorption and desorption behaviors for aqueous fluoride were investigated.Results showed that adsorption isotherm of F-onto ZrO2-MWCT could be modeled by Freundlich equation.The pseudo-second-order kinetics could fit the adsorption data very well and adsorption rate decreased with increasing initial F-concentration.The maximum adsorption amount of F-on ZrO2-MWCT was found to be at pH 4~5.The presence of anions in solution resulted in the suppressed F-adsorption onto ZrO2-MWCT,and the effect of different anions was in the order of CO32-SO42-Cl-NO3-.Fluoride loaded ZrO2-MWCT was regenerated by 0.1mol/L NaOH solution and F-adsorption amount was 14.55mg/g after four adsorption-regeneration cycles.