Nanoporous Detectors of Monocyclic Aromatic Compounds and Other Pollutants

• US 20110151573A1
• Filed: 07/10/2009
• Published: 06/23/2011
• Est. Priority Date: 07/11/2008
• Status: Active Grant

• Current Assignee: Centre National De La Recherche Scientifique, Commissariat a L'Energie Atomique (French Alternative Energies and Atomic Energy Commission)
• Original Assignee: Centre National De La Recherche Scientifique, Commissariat a L'Energie Atomique (French Alternative Energies and Atomic Energy Commission)
• Inventors: Tran-Thi, Thu-Hoa, Crunaire, Sabine
• Granted Patent: US 8,759,111 B2
• Time in Patent Office: Days
• US Class Current: 436/130
• CPC Class Codes: B01J 20/10 comprising silica or silicate
• CPC Class Codes: B01J 20/26 Synthetic macromolecular compounds
• CPC Class Codes: B01J 20/28047 Gels
• CPC Class Codes: B01J 20/2808 being less than 2 nm, i.e. micropores or nanopores
• CPC Class Codes: C03B 19/12 by liquid-phase reaction processes
• CPC Class Codes: C08L 83/08 containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
• CPC Class Codes: G01N 33/0004 Gaseous mixtures, e.g. polluted air
• CPC Class Codes: Y02P 40/57 Improving the yield, e-g- reduction of reject rates
• CPC Class Codes: Y10T 436/20 Oxygen containing
• CPC Class Codes: Y10T 436/200833 Carbonyl, ether, aldehyde or ketone containing
• CPC Class Codes: Y10T 436/201666 Carboxylic acid
• CPC Class Codes: Y10T 436/202499 Formaldehyde or acetone
• CPC Class Codes: Y10T 436/21 Hydrocarbon
• CPC Class Codes: Y10T 436/212 Aromatic
• CPC Class Codes: Y10T 436/214 Acyclic [e.g., methane, octane, isoparaffin, etc.]
• CPC Class Codes: Y10T 436/216 Unsaturated [e.g., ethylene, diene, etc.]
• CPC Class Codes: Y10T 436/25375 Liberation or purification of sample or separation of material from a sample [e.g., filtering, centrifuging, etc.]
• CPC Class Codes: Y10T 436/255 including use of a solid sorbent, semipermeable membrane, or liquid extraction

Abstract

Porous sol-gel material essentially consisting of units of one or more first polyalkoxysilanes chosen from the following compounds: (chloromethyl)triethoxysilane; 1,3-dimethyltetramethoxydisiloxane; ethyl trimethoxysilane; triethoxy(ethyl)silane; triethoxymethylsilane; triethoxy(vinyl)silane; trimethoxymethylsilane; trimethoxy(vinyl)silane; tetraethoxysilane or tetramethoxysilane (TMOS) and of units of one or more second polyalkoxysilanes chosen from the following compounds: (N-(3-(trimethoxysilyl)propyl)ethylenediamine; 3-aminopropyltriethoxysilane (APTES) and 3-aminopropyltrimethoxysilane, in a first polyalkoxysilane/second polyalkoxysilane molar ratio of 1/0.01 to 1/1, optionally comprising a probe molecule, method of preparation and applications in the trapping of monocyclic aromatic hydrocarbons and other pollutants or in their detection.

Claims

1. A porous sol-gel material formed essentially from:

units of one or more first polyalkoxysilane(s) chosen from the following compounds;

(chloromethyl)triethoxysilane;

1,3-dimethyltetramethoxydisiloxane;

ethyltrimethoxysilane;

triethoxy(ethyl)silane;

triethoxymethylsilane;

triethoxy(vinyl)silane;

trimethoxymethylsilane;

trimethoxy(vinyl)silane;

tetraethoxysilane or tetramethoxysilane (TMOS); and

units of one or more second polyalkoxysilane(s) chosen from the following compounds;

(N-(3-(trimethoxysilyl)propyl)ethylenediamine;

3-aminopropyltriethoxysilane (APTES) and 3-aminopropyltrimethoxysilane, in a first polyalkoxysilane(s)/second polyalkoxysilane(s) mole ratio of 1/0.01 to 1/1.

2. A sol-gel material as claimed in claim 1, characterized in that the first polyalkoxysilane(s)/second polyalkoxysilane(s) mole ratio is from 1/0.01 to 1/0.30.

3. A sol-gel material as claimed in claim 1, characterized in that the first polyalkoxysilane(s) are chosen from the following compounds:

methyltrimethoxysilane, tetraethoxysilane, methyltriethoxysilane and tetramethoxysilane (TMOS).

4. A sol-gel material as claimed in claim 1, characterized in that it comprises:

a single first polyalkoxysilane, or

a single first polyalkoxysilane and a single second polyalkoxysilane.

5. A sol-gel material as claimed in claim 1, characterized in that the second polyalkoxysilane is 3-aminopropyltriethoxysilane.

6. A sol-gel material as claimed in claim 1, characterized in that it comprises a probe molecule.

7. A sol-gel material as claimed in claim 6, characterized in that the probe molecule is chosen from hydralazine, 4-amino-3-penten-2-one, 2,4-dinitrophenylhydrazine, iodine oxides, triphenylmethane derivatives, azobenzene derivatives and alkyl halides.

8. A process for preparing a sol-gel material as defined in claim 1, characterized in that the first polyalkoxysilane(s) are mixed, at a temperature between −

45 and +30°

C., with a water-miscible organic solvent therefor, the second polyalkoxysilane is then added, water is added, supplemented, if desired, with a catalyst or a structuring agent, or both, and stirring is continued to obtain the sol and then the expected sol-gel, which, if desired, is placed in sol form in molds to obtain expected sol-gel blocks.

9. A process as claimed in claim 8, characterized in that the mixing of the first polyalkoxysilane(s) with a water-miscible organic solvent therefor is performed for a time of between 1 and 10 minutes.

10. A process as claimed in claim 8, characterized in that the polyalkoxysilanes/solvent/water mole ratio is from 1/4/1 to 1/100/30.

11. A process for preparing a sol-gel material incorporating a probe molecule as defined in claim 6, characterized in that a probe molecule is added either directly during the preparation of the sol of the sol-gel material, or by diffusion of this probe molecule into the material via gas-phase or liquid-phase diffusion.

12. The use of a sol-gel material as defined in claim 1 in the trapping of monocyclic aromatic hydrocarbons and other pollutants, or in their detection.

13. A process for trapping monocyclic aromatic hydrocarbons using, as sensor, a sol-gel material as defined in claim 1, in which a stream that may contain monocyclic aromatic hydrocarbons is placed in contact with the sol-gel material, optionally incorporating a probe molecule, or such a stream is made to circulate thereon.

14. A process as claimed in claim 12, characterized in that the detection of the monocyclic aromatic hydrocarbons trapped on the sol-gel materials optionally incorporating a probe molecule is also performed.

15. A process for trapping pollutants chosen from aldehydes, aromatic compounds, alkanes, carboxylic acids, ketones and chlorine using as sensor a sol-gel material as defined in claim 1, incorporating a probe molecule, in which a stream that may contain a pollutant from among those mentioned above is placed in contact with said sol-gel material incorporating a probe molecule, or such a stream is made to circulate thereon.

16. A system for trapping or detecting monocyclic aromatic hydrocarbons or a pollutant using as sensor a sol-gel material as defined in claim 1, optionally incorporating a probe molecule.