Adsorption of fluoride from water by aligned carbon nanotubes

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 fluoride adsorption rate is fast in the first 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 fluoride 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 fluoride concentration of 15 mg/l. The experimental results indicate that ACNTs are promising candidate materials for fluoride removal. (C) 2003 Elsevier Science Ltd. All rights reserved.

[1]  W. P. Harkare,et al.  Defluoridation during desalination of brackish water by electrodialysis , 1989 .

[2]  S. Saha.  Treatment of aqueous effluent for fluoride removal , 1993 .

[3]  Hakim Lounici,et al.  Study of a new technique for fluoride removal from water , 1997 .

[4]  Yanxin Wang,et al.  Activation and regeneration of a soil sorbent for defluoridation of drinking water , 2001 .

[5]  P. Ajayan,et al.  Aligned Carbon Nanotube Arrays Formed by Cutting a Polymer Resin—Nanotube Composite , 1994, Science.

[6]  S. Wasay,et al.  Adsorption of fluoride, phosphate, and arsenate ions on lanthanum- impregnated silica gel , 1996 .

[7]  Robert P. H. Chang,et al.  A nanotube-based field-emission flat panel display , 1998 .

[8]  R. T. Yang,et al.  Carbon nanotubes as superior sorbent for dioxin removal. , 2001, Journal of the American Chemical Society.

[9]  Bingqing Wei,et al.  Lead adsorption on carbon nanotubes , 2002 .

[10]  Pulickel M. Ajayan,et al.  Application of Carbon Nanotubes as Supports in Heterogeneous Catalysis , 1994 .

[11]  Ji Liang,et al.  Hydrogen storage of dense-aligned carbon nanotubes , 2001 .

[12]  M. A. Sánchez-Castillo,et al.  Adsorption of fluoride from aqueous solution on aluminum-impregnated carbon , 1999 .

[13]  J. C. Liu,et al.  Fluoride removal from water with spent catalyst , 1996 .

[14]  A. A. Dantas Neto,et al.  Removal of chromium from aqueous solutions by diatomite treated with microemulsion. , 2001, Water research.

[15]  K. P. Yadava,et al.  Defluoridation of water by adsorption on fly ash , 1990 .

[16]  J. Sandeaux,et al.  Fluoride removal from diluted solutions by Donnan dialysis with anion-exchange membranes , 1999 .

[17]  S. Iijima.  Helical microtubules of graphitic carbon , 1991, Nature.

[18]  D. Killedar,et al.  Fluoride adsorption on fishbone charcoal through a moving media adsorber , 1992 .