Low temperature synthesis of aluminum hydr(oxide) inside porous media
Preparing a porous hybrid media includes contacting porous media (e.g., strong base ion-exchange media) with an aqueous solution including aluminum ions to yield a aluminum-ion-containing porous media, contacting the aluminum-ion containing porous media with a reducing agent to impregnate elemental aluminum in the porous media, and oxidizing the elemental aluminum to yield a porous hybrid media including aluminum hydr(oxide) impregnated in the porous media. In some cases, a pH of an aqueous mixture including the aluminum-ion-containing porous media may be adjusted to form a floc including aluminum hydroxide, and the aluminum hydroxide-containing porous media may be contacted with a reducing agent to yield a porous hybrid media including aluminum hydr(oxide) impregnated in the porous media. The porous hybrid media may advantageously be prepared at low temperature (e.g., room temperature).
1. A method of preparing a porous hybrid media, the method comprising:
contacting porous media with an aqueous solution comprising aluminum ions to yield a aluminum-ion-containing porous media;
contacting the aluminum-ion containing porous media with a reducing agent to impregnate elemental aluminum in the porous media; and
oxidizing the elemental aluminum to yield a porous hybrid media comprising aluminum hydr(oxide) impregnated in the porous media.
2. The method of claim 1 , wherein the aluminum ions are derived from aluminum chloride.
3. The method of claim 1 , wherein the reducing agent comprises borohydride.
4. The method of claim 1 , wherein preparing the porous hybrid media occurs at room temperature or a temperature less than about 40° C.
5. The method of claim 1 , wherein the porous media comprises strong base ion-exchange media.
6. The method of claim 1 , wherein an aluminum content of the porous hybrid media is between 2 wt % and 3 wt %.
7. The method of claim 1 , wherein the aluminum hydr(oxide) comprises γ-Al 2 O 3 , amorphous Al 2 O 3 , or a combination thereof.
8. The method of claim 1 , wherein oxidizing the elemental aluminum comprises contacting the elemental aluminum with oxygen.
9. The method of claim 8 , wherein contacting the elemental aluminum with oxygen comprises contacting the elemental aluminum with air.