Fluoride removal by ordered and disordered mesoporous aluminas

Chao Yang, Lili Gao, Yanxin Wang, Xike Tian, Sridhar Komarneni

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Highly ordered and disordered (MA-n) mesoporous aluminas with excellent fluoride adsorption performance have been successfully developed. The physicochemical and adsorption properties were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), nitrogen adsorption-desorption isotherms and fluoride removal experiments. Highly ordered mesoporous structure (OMA) was produced by using aluminum metal organic as precursor and wormlike disordered mesoporous structure (MA-n, MA-cl) was synthesized from inorganic aluminum salt precursors. The synthesized mesoporous alumina with a large pore size distribution of 7-14 nm and large surface areas in the range of 163-338 m2/g are beneficial for transport of solution in interconnected mesoporous channels and the fluoride ion was anchored on plenty of surface hydroxyl groups which provide high fluoride adsorption capacity and efficiency. Adsorption kinetics was described by pseudo-second-order, pseudo-first-order and intra-particle pore diffusion models, while, their adsorption equilibrium isotherms were described reasonably well by Langmuir model. Maximum fluoride adsorption capacities of OMA-400, OMA-850 and MA-n were 135, 91 and 95 mg/g, respectively, which are higher than many reported alumina based adsorbents. Due to the ordered mesoporous structure which decreases the liquid transfer resistance, the OMA-400 showed extremely faster adsorption kinetics with a removal of 90% of F- within 20 min at an optimal pH of 6. Presence of other anions like SO4 2-, NO3-, Cl- and HCO 3- effect on fluoride removal efficiency and desorption study of OMA-400 and OMA-850 were also determined and compared.

Original languageEnglish (US)
Pages (from-to)156-163
Number of pages8
JournalMicroporous and Mesoporous Materials
Volume197
DOIs
StatePublished - Jan 1 2014

Fingerprint

Aluminum Oxide
Fluorides
fluorides
Alumina
aluminum oxides
Adsorption
adsorption
Aluminum
Isotherms
Desorption
isotherms
desorption
aluminum
porosity
Kinetics
kinetics
adsorbents
Hydroxyl Radical
Adsorbents
Pore size

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

Cite this

Yang, Chao ; Gao, Lili ; Wang, Yanxin ; Tian, Xike ; Komarneni, Sridhar. / Fluoride removal by ordered and disordered mesoporous aluminas. In: Microporous and Mesoporous Materials. 2014 ; Vol. 197. pp. 156-163.
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abstract = "Highly ordered and disordered (MA-n) mesoporous aluminas with excellent fluoride adsorption performance have been successfully developed. The physicochemical and adsorption properties were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), nitrogen adsorption-desorption isotherms and fluoride removal experiments. Highly ordered mesoporous structure (OMA) was produced by using aluminum metal organic as precursor and wormlike disordered mesoporous structure (MA-n, MA-cl) was synthesized from inorganic aluminum salt precursors. The synthesized mesoporous alumina with a large pore size distribution of 7-14 nm and large surface areas in the range of 163-338 m2/g are beneficial for transport of solution in interconnected mesoporous channels and the fluoride ion was anchored on plenty of surface hydroxyl groups which provide high fluoride adsorption capacity and efficiency. Adsorption kinetics was described by pseudo-second-order, pseudo-first-order and intra-particle pore diffusion models, while, their adsorption equilibrium isotherms were described reasonably well by Langmuir model. Maximum fluoride adsorption capacities of OMA-400, OMA-850 and MA-n were 135, 91 and 95 mg/g, respectively, which are higher than many reported alumina based adsorbents. Due to the ordered mesoporous structure which decreases the liquid transfer resistance, the OMA-400 showed extremely faster adsorption kinetics with a removal of 90{\%} of F- within 20 min at an optimal pH of 6. Presence of other anions like SO4 2-, NO3-, Cl- and HCO 3- effect on fluoride removal efficiency and desorption study of OMA-400 and OMA-850 were also determined and compared.",
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Fluoride removal by ordered and disordered mesoporous aluminas. / Yang, Chao; Gao, Lili; Wang, Yanxin; Tian, Xike; Komarneni, Sridhar.

In: Microporous and Mesoporous Materials, Vol. 197, 01.01.2014, p. 156-163.

Research output: Contribution to journalArticle

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AU - Yang, Chao

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AB - Highly ordered and disordered (MA-n) mesoporous aluminas with excellent fluoride adsorption performance have been successfully developed. The physicochemical and adsorption properties were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), nitrogen adsorption-desorption isotherms and fluoride removal experiments. Highly ordered mesoporous structure (OMA) was produced by using aluminum metal organic as precursor and wormlike disordered mesoporous structure (MA-n, MA-cl) was synthesized from inorganic aluminum salt precursors. The synthesized mesoporous alumina with a large pore size distribution of 7-14 nm and large surface areas in the range of 163-338 m2/g are beneficial for transport of solution in interconnected mesoporous channels and the fluoride ion was anchored on plenty of surface hydroxyl groups which provide high fluoride adsorption capacity and efficiency. Adsorption kinetics was described by pseudo-second-order, pseudo-first-order and intra-particle pore diffusion models, while, their adsorption equilibrium isotherms were described reasonably well by Langmuir model. Maximum fluoride adsorption capacities of OMA-400, OMA-850 and MA-n were 135, 91 and 95 mg/g, respectively, which are higher than many reported alumina based adsorbents. Due to the ordered mesoporous structure which decreases the liquid transfer resistance, the OMA-400 showed extremely faster adsorption kinetics with a removal of 90% of F- within 20 min at an optimal pH of 6. Presence of other anions like SO4 2-, NO3-, Cl- and HCO 3- effect on fluoride removal efficiency and desorption study of OMA-400 and OMA-850 were also determined and compared.

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