Although TiO2 exhibits a small fluoride ion exchange capacity, it was found that titanium hydroxide, Ti(OH)4, can exchange fluoride ion with large saturation capacity of 1.60m• mol/g. Although the H2PO4 in terferes with the F exchange, the amount of F exchange of Ti(OH)4 was hardly changed by the coexis tence of Cl-, NO3-, and SO42-. The capacity for F-exchange was almost unchanged over 4 times repetition of ion-exchange and desorption and furthermore, the elution of Ti was negligibly small. Consequently, Ti(OH)4 is expected to be a new inorganic F-exchanger for the removal of fluoride ion from wastewater.
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