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|Title: ||Phosphate adsorption on aluminum-impregnated mesoporous silicates: surface and behavior of adsorbents|
|Authors: ||Eun, Woo Shin|
Han, James S.
Soo, Hong Min
Jae, Kwang Park
Rowell, Roger M.
|Issue Date: ||2004|
|Publisher: ||American Chemical Society|
|Citation: ||Evironmental Science & Technology, vol. 38, no. 3, 2004, pages 912-917|
|Abstract: ||Phosphorus from excess fertilizers and detergents ends
up washing into lakes, creeks, and rivers. This overabundance
of phosphorus causes excessive aquatic plant and algae
growth and depletes the dissolved oxygen supply in the water.
In this study, aluminum-impregnated mesoporous adsorbents
were tested for their ability to remove phosphate from
water. The surface structure of the materials was investigated
with X-ray diffraction (XRD), a N2 adsorption-desorption
technique, Fourier transform-infrared (FT-IR), and X-ray
photoelectron spectroscopy (XPS) to understand the effect
of surface properties on the adsorption behavior of
phosphate. The mesoporous materials were loaded with
Al components by reaction with surface silanol groups. In
the adsorption test, the Al-impregnated mesoporous
materials showed fast adsorption kinetics as well as high
adsorption capacities, compared with activated alumina.
The uniform mesopores of the Al-impregnated mesoporous
materials caused the diffusion rate in the adsorption
process to increase, which in turn caused the fast adsorption
kinetics. High phosphate adsorption capacities of the Alimpregnated
mesoporous materials were attributed to not
only the increase of surface hydroxyl density on Al
oxide due to well-dispersed impregnation of Al components
but also the decrease in stoichiometry of surface hydroxyl
ions to phosphate by the formation of monodentate
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