Abstract: Attapulgite is a fibrous clay mineral containing ribbons of a 2:1 phyllosilicate structure, and has special adsorptive and colloidal properties which are the basis for environmental applications. Defluoridation by attapulgite in laboratory samples of aqueous fluoride solutions has been investigated which shows a greater defluoridation at acidic F-solution than at neutral and alkaline. As the pH increases from 2 to 6, there is a decrease in the percentage of defluoridation, and further increase of pH has negligible effect on fluoride remova1. The F adsorbing property described makes attapulgite highly suitable for environmental protections.