Low temperature synthesis of aluminum hydr(oxide) inside porous media

Patent metadata

Field	Value
Publication number	US-10435311-B2
Application number	US-201715718074-A
Country	US
Kind code	B2
Filing date	Sep 28, 2017
Priority date	Sep 28, 2016
Publication date	Oct 8, 2019
Grant date	Oct 8, 2019

Abstract

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).

First claim

What is claimed is:

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 mixture;
adjusting a pH of the mixture to form a floc comprising aluminum hydroxide;
removing liquid from the mixture to yield aluminum hydroxide-containing porous media;
contacting the aluminum hydroxide-containing porous media with a reducing agent 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 adjusting the pH of the mixture comprises increasing the pH of the mixture to less than 6.

5. The method of claim 4 , wherein adjusting the pH of the mixture further comprises, after increasing the pH of the mixture to less than 6, increasing the pH of the mixture to greater than 6 and less than 8.

6. The method of claim 1 , wherein preparing the porous hybrid media occurs at room temperature or a temperature less than about 40° C.

7. The method of claim 1 , the porous media comprises strong base ion-exchange media.

8. The method of claim 1 , wherein an aluminum content of the porous hybrid media is between 3 wt % and 4 wt %.

9. The method of claim 1 , wherein the aluminum hydr(oxide) comprises γ-Al 2 O 3 , amorphous Al 2 O 3 , amorphous AlO(OH), or a combination thereof.

Assignees

• Hristovski Kiril D
• Markovski Jasmina
• Westerhoff Paul K
• Sinha Shahnawaz
• Univ Arizona State

Inventors

• Hristovski Kiril D
• Markovski Jasmina
• Westerhoff Paul K
• Sinha Shahnawaz

Classifications

• C02F1/285

  using synthetic organic sorbents · CPC title

• B01J20/08

  comprising aluminium oxide or hydroxide; comprising bauxite · CPC title

• C02F2001/422

  using anionic exchangers · CPC title

• B01J20/3236

  containing metal, other than zeolites, e.g. oxides, hydroxides, sulphides or salts · CPC title

• C02F1/288 Primary

  using composite sorbents, e.g. coated, impregnated, multi-layered · CPC title