Microwave assisted synthesis of metal dioxide based hybrid media

Patent metadata

Field	Value
Publication number	US-9878320-B2
Application number	US-201514796156-A
Country	US
Kind code	B2
Filing date	Jul 10, 2015
Priority date	Jul 11, 2014
Publication date	Jan 30, 2018
Grant date	Jan 30, 2018

Abstract

Hybrid media formed by combining a metal precursor solution with particulate media to yield a mixture, decanting the mixture to yield a decanted mixture, heating the decanted mixture in via microwave radiation to yield hybrid media, rinsing the hybrid media with water, soaking the rinsed hybrid media in a salt solution, and rinsing the soaked hybrid media with water. The hybrid media includes a metal dioxide derived from the metal precursor, such as TiO 2 derived from TiOSO 4 .

First claim

What is claimed is:

1. A method of synthesizing hybrid media, the method comprising:
combining a metal precursor solution with particulate media to yield a mixture, wherein the particulate media comprises activated carbon based media;
decanting the mixture to yield a decanted mixture;
heating the decanted mixture in via microwave radiation to yield hybrid media, wherein the hybrid media comprises a metal dioxide derived from the metal precursor;
rinsing the hybrid media with water;
soaking the rinsed hybrid media in a salt solution;
rinsing the soaked hybrid media with water; and
placing the hybrid media in contact with contaminated water comprising organic compounds, weak acid oxo-anions, or a combination thereof, wherein the hybrid media removes at least some of the organic compounds and the weak acid oxo-anions from the contaminated water.

2. The method of claim 1 , further comprising preparing the metal precursor solution before combining the metal precursor solution with the particulate media.

3. The method of claim 1 , wherein the weak acid oxo-anions are selected from the group consisting of arsenate, arsenite, chromate, and phosphate.

4. The method of claim 1 , wherein the metal of the metal precursor is titanium or zirconium.

5. The method of claim 1 , wherein the anion of the metal precursor is an oxosulfate, oxonitrate, or oxochloride.

6. The method of claim 1 , wherein the decanted mixture is heated to a temperature of at least 100° C.

7. The method of claim 1 , further comprising washing the rinsed hybrid media until metal dioxide particles are not visible in the wash water.

8. The method of claim 1 , wherein the concentration of the metal precursor solution is between 1 g/L and 124 g/L of the metal precursor.

9. The method of claim 1 , wherein the volume ratio of the metal precursor solution to the particulate media is in a range of 1:1 to 3:1.

10. The method of claim 1 , wherein the salt solution is a sodium chloride solution.

11. The method of claim 10 , wherein the sodium chloride solution is 1 wt % to 10 wt % sodium chloride.

12. The method of claim 1 , wherein rinsing the hybrid media with water comprises rinsing the hybrid media with water until the rinse water is free of metal dioxide particles.

13. The method of claim 1 , further comprising ashing the rinsed, soaked hybrid media to yield a porous nanostructured metal oxide.

14. The method of claim 13 , wherein ashing the rinsed, soaked hybrid media comprises heating the rinsed, soaked hybrid media to a temperature in a range between 500° C. and 600° C.

Assignees

• Hristovski Kiril D
• Westerhoff Paul K
• Univ Arizona State

Inventors

• Hristovski Kiril D
• Westerhoff Paul K

Classifications

• C02F2101/103

  Arsenic compounds · CPC title

• C02F2101/163

  Nitrates · CPC title

• B01J41/10

  Inorganic material · CPC title

• B01J41/02 Primary

  Processes using inorganic exchangers · CPC title

• B01J41/18

  Carbon, coal or tar · CPC title