Adsorption of fluoride from water by aligned carbon nanotubes

Abstract

Aligned carbon nanotubes (ACNTs), a new type of carbon material, were prepared by catalytic decomposition of xylene using ferrocene as catalyst. The kinetics experiment of ACNTs shows that¯uoride adsorption rate is fast in the ®rst 60 min and the adsorption capacity reaches 3.0 mg/g rapidly, then it decreases and adsorption achieves equilibrium gradually in about 180 min. The¯uoride adsorption of ACNTs depends slightly on the solution pH value. The highest adsorption capacity of ACNTs occurs at pH 7 and reaches 4.5 mg/g at equilibrium uoride concentration of 15 mg/l. The experimental results indicate that ACNTs are promising candidate materials for¯uoride removal. #

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