Cadmium sulfide quantum dots

Patent metadata

Field	Value
Publication number	US-2016288106-A1
Application number	US-201615074169-A
Country	US
Kind code	A1
Filing date	Mar 18, 2016
Priority date	Mar 20, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

Provided herein are compositions comprising cadmium sulfide quantum dot photocatalysts and methods and systems utilizing as much (e.g., for the reduction of a nitrobenzene to an aniline).

First claim

1 . A system comprising:
(a) a cadmium sulfide (CdS) quantum dot (QD); and (b) a nitrobenzene compound.

2 . The system of claim 1 , wherein the nitrobenzene compound is selected from the group consisting of: nitrobenzene, 4-nitrobenzoic acid, methyl 4-nitrobenzoate, 1-chloro-4-nitrobenzene, 1-fluoro-4-nitrobenzene, 4-nitroaniline, 1-tertbutyl-4-nitrobenzene, 2,4,6-tri-tertbutyl-nitrobenzene, 1,3-dimethyl-2-nitrobenzene, 1,3-dimethyl-5-nitrobenzene, 2,4,6-trinitrotoluene, 2,4-dinitrotoluene, 2,6-dinitrotoluene, 2,3-dinitrotoluene, 2,5-dinitrotoluene, 3,4-dinitrotoluene, 3,5-dinitrotoluene, 1,3,5-trinitrobenzene, 2,4,6-trinitrophenol, and 2,4,6-trinitro-1,3-benzenediol.

2 . (canceled)

3 . The system of claim 1 , further comprising one or more solvents.

4 . The system of claim 3 , wherein the one or more solvents comprise water and/or methanol.

5 . (canceled)

6 . The system of claim 1 , further comprising one or more sacrificial reductants.

7 . The system of claim 6 , wherein the one or more sacrificial reductants comprise an alcohol, a thiol, a carboxylate, and/or ascorbic acid.

8 . The system of claim 6 , wherein the one or more sacrificial reductants comprise methanol and/or 3-mercaptopropionic acid.

9 . The system of claim 1 , further comprising an aniline.

10 . (canceled)

11 . The system of claim 9 , wherein the aniline is selected from the group consisting of: aniline, 4-aminobenzoic acid, methyl 4-aminobenzoate, 1-chloro-4-aminobenzene, 1-fluoro-4-aminobenzene, 4-aminoaniline, 1-tertbutyl-4-aminobenzene, 2,4,6-tri-tertbutyl-aminobenzene, 1,3-dimethyl-2-aminobenzene, 1,3-dimethyl-5-aminobenzene, 2,4,6-triaminotoluene, 2,4-diaminotoluene, 2,6-diaminotoluene, 2,3-diaminotoluene, 2,5-diaminotoluene, 3,4-diaminotoluene, 3,5-diaminotoluene, 1,3,5-triaminobenzene, 2,4,6-triaminophenol, and 2,4,6-triamino-1,3-benzenediol.

12 . (canceled)

13 . The system of claim 1 , having a pH below 6.0.

14 . The system of claim 1 , having a pH between 2 and 5.

15 . The system of claim 1 , wherein the cadmium sulfide quantum dot is in solution.

16 . The system of claim 1 , further comprising a surface, wherein the cadmium sulfide quantum dot is adhered to the surface.

17 . The system of claim 1 , wherein the surface is the interior of a vessel.

18 . A method of reducing a nitrobenzene to an aniline comprising illuminating a system of claim 1 with light at a wavelength between 350 nm and 450 nm.

19 . The method of claim 18 , wherein the light is at a wavelength between 395 nm and 415 nm.

20 . A catalytic composition comprising:
(a) CdS quantum dots; (b) water; (c) methanol; and (d) 3-mercaptopropionic acid.

21 . A method of reducing a nitrobenzene to an aniline comprising exposing the nitrobenzene to the catalytic composition of claim 20 and illuminating with light at a wavelength between 350 nm and 450 nm at an acidic pH.

22 . The method of claim 21 , wherein the light is at a wavelength between 395 nm and 415 nm.

23 . The method of claim 18 , wherein the aniline is produced from the nitrobenzene through a phenylhydroxylamine intermediate.

24 . A method for converting a nitrobenzene to an aniline comprising cadmium-sulfide-quantum-dot catalyzed photoreduction through a phenylhydroxylamine intermediate.

Assignees

• Univ Northwestern

Inventors

• Jensen Stephen C
• Weiss Emily A

Classifications

• B01J2235/05

  Nuclear magnetic resonance [NMR] · CPC title

• B01J2235/10

  Infrared [IR] · CPC title

• B01J2235/00

  Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties · CPC title

• B01J31/26

  containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24 · CPC title

• B01J35/004

  Operations & Transport · mapped topic