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Nitrate reduction method, nitrate reduction catalyst, nitrate reduction electrode, fuel cell, and water treatment apparatus

Foreign code F180009412
File No. E089P17US1
Posted date Apr 20, 2018
Country United States of America
Application number 201715489099
Gazette No. 20170217800
Date of filing Apr 17, 2017
Gazette Date Aug 3, 2017
International application number JP2012081753
International publication number WO2013085022
Date of international filing Dec 7, 2012
Date of international publication Jun 13, 2013
Priority data
  • P2011-269761 (Dec 9, 2011) JP
  • 2012WO-JP81753 (Dec 7, 2012) WO
  • 2014US-14361579 (May 29, 2014) US
Title Nitrate reduction method, nitrate reduction catalyst, nitrate reduction electrode, fuel cell, and water treatment apparatus
Abstract (US20170217800)
A nitrate reduction method includes the step of reducing at least one type selected from a group of nitrates and nitrites at an active site included in a defect of graphene in a reduction reaction, wherein the graphene is a reduced product of graphene oxide, and the defect of the graphene is derived from a defect of the graphene oxide.
Scope of claims [claim1]
1. A nitrate reduction method comprising a step of: reducing at least one type selected from a group of nitrates and nitrites at an active site included in a defect of graphene in a reduction reaction, wherein
the graphene is a reduced product of graphene oxide, and
the defect of the graphene is derived from a defect of the graphene oxide.
[claim2]
2. The nitrate reduction method according to claim 1, further comprising steps of; preparing an aqueous solution containing at least one type selected from a group of the nitrates and the nitrites; and
applying a voltage across the aqueous solution by use of a cathode including the graphene.
[claim3]
3. The nitrate reduction method according to claim 1, further comprising a step of adjusting a pH of the aqueous solution to a range of -0.5 to -0.7.
[claim4]
4. The nitrate reduction method according to claim 2, further comprising a step of adjusting a pH of the aqueous solution to a range of -0.5 to -0.7.
[claim5]
5. The nitrate reduction method according to of claim 2, wherein: the aqueous solution contains the nitrates; and
the nitrate reduction method further comprises a step of adding the nitrites to the aqueous solution.
[claim6]
6. The nitrate reduction method according to of claim 3, wherein: the aqueous solution contains the nitrates; and
the nitrate reduction method further comprises a step of adding the nitrites to the aqueous solution.
[claim7]
7. A nitrate reduction catalyst comprising: the graphene, wherein
the nitrate reduction catalyst is a catalyst for the reduction reaction in the nitrate reduction method according to claim 1.
[claim8]
8. A nitrate reduction electrode comprising the nitrate reduction catalyst according to claim 7.
[claim9]
9. The nitrate reduction electrode according to claim 8, wherein an onset potential for nitrate reduction is 0.8 V vs. Ag/AgCl.
[claim10]
10. A water treatment apparatus comprising: a vessel to receive an aqueous solution containing ammonium ions and at least one type selected from a group of nitrates and nitrites;
a base material which is electrically conductive and disposed in the vessel;
an oxidation catalyst supported on the base material; and
the nitrate reduction catalyst according to claim 7,
the nitrate reduction catalyst being supported on the base material and not in contact with the oxidation catalyst.
[claim11]
11. A water treatment apparatus comprising: a vessel to receive an aqueous solution containing at least one type selected from a group of nitrates and nitrites; and
an anode and a cathode both in the vessel,
the cathode being the nitrate reduction electrode according to claim 8.
[claim12]
12. The water treatment apparatus according to claim 11, further comprising a nitrite supplier for supplying the nitrites to the aqueous solution.
[claim13]
13. A water treatment apparatus comprising: a vessel to receive an aqueous solution containing at least one type selected from a group of nitrates and nitrites; and
an anode and a cathode both in the vessel,
the cathode being the nitrate reduction electrode according to claim 9.
[claim14]
14. A fuel cell comprising: a vessel to receive an aqueous solution containing ammonium ions and at least one type selected from a group of nitrates and nitrites; and
an anode and a cathode both in the vessel,
the cathode being the nitrate reduction electrode according to claim 8.
[claim15]
15. The water treatment apparatus according to claim 10, further comprising a nitrite supplier for supplying the nitrites to the aqueous solution.
[claim16]
16. The fuel cell according to claim 14, further comprising a nitrite supplier for supplying the nitrites to the aqueous solution.
[claim17]
17. A fuel cell comprising: a vessel to receive an aqueous solution containing ammonium ions and at least one type selected from a group of nitrates and nitrites; and
an anode and a cathode both in the vessel,
the cathode being the nitrate reduction electrode according to claim 9.
  • Inventor, and Inventor/Applicant
  • NAKANISHI SHUJI
  • HASHIMOTO KAZUHITO
  • KAMIYA KAZUHIDE
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • PANASONIC CORPORATION
IPC(International Patent Classification)
Reference ( R and D project ) ERATO HASHIMOTO Light Energy Conversion AREA
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