Synthesis of a Functional Clay Mineral from Paper Sludge Ash (PS ash) and Its Ability of Removal for Dye

Abstract

A functional clay mineral (Layered Double Hydroxide : LDH), whose main components were calcium and aluminum, was prepared by a co-precipitation method at 30 degree from PS ash. The resulting materials were investigated by XRD, SEM, EDX, TG-DTA and N2adsorption observation and were used to remove an anionic dye (Remazol Violet 5 R) from an aqueous solution at 30 degree. Adsorption isotherms showed convex upward and the adsorption data were fitted to Langmuir equation. LDH (8), which was synthesized under the condition of Ca⁄Al molar ratio=8, shows maximum adsorption ability of an anionic dye.