TY - JOUR
T1 - Fluoride removal by ordered and disordered mesoporous aluminas
AU - Yang, Chao
AU - Gao, Lili
AU - Wang, Yanxin
AU - Tian, Xike
AU - Komarneni, Sridhar
N1 - Funding Information:
This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 51371162 and 51344 007 ) and the National Basic Research Program of China (Grant No. 2011CB933700 ).
Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014/10
Y1 - 2014/10
N2 - 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.
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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U2 - 10.1016/j.micromeso.2014.06.010
DO - 10.1016/j.micromeso.2014.06.010
M3 - Article
AN - SCOPUS:84904018585
SN - 1387-1811
VL - 197
SP - 156
EP - 163
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
ER -