Agent for adsorption of ruthenium from aqueous solution and method for adsorption of ruthenium from aqueous solution

Patent metadata

Field	Value
Publication number	US-2018071712-A1
Application number	US-201615560348-A
Country	US
Kind code	A1
Filing date	Mar 22, 2016
Priority date	Mar 24, 2015
Publication date	Mar 15, 2018
Grant date	—

Abstract

An adsorbent is provided to adsorb ruthenium from aqueous solution for recovery and/or reuse or removal of said ruthenium, and a method for purifying, for example, sea water and/or water containing sodium ions, magnesium ions, calcium ions, chlorine ions or other ions, polluted with a radioactive element, using said adsorbent.
The ruthenium adsorbent includes manganese in the form of oxides thereof. The adsorbent can further include at least one additional transition metal element other than manganese, such as copper. The adsorbent soaked in water removes radioactive ruthenium or the like through adsorption, and thereby can purify, for example, sea water and/or water containing sodium ions, magnesium ions, calcium ions, chlorine ions or other ions.

First claim

1 . A ruthenium adsorbent for adsorbing ruthenium from an aqueous solution thereof, said ruthenium adsorbent comprising manganese oxides as a primary component, provided that manganese oxides consisting of ε-MnO 2 and/or γ-MnO 2 are excluded from the manganese oxides.

2 . The ruthenium adsorbent according to claim 1 , wherein the aqueous solution comprises ruthenium in the form of a ruthenium cation, and/or a ruthenium complex ion and/or a ruthenate ion.

3 . The ruthenium adsorbent according to claim 1 , wherein the manganese oxides have an amorphous structure and/or a layered structure and/or a tunnel structure.

4 . The ruthenium adsorbent according to claim 3 , wherein, in the case that the manganese oxides have a tunnel structure, the adsorbent comprises oxides of manganese having at least two linked MnO 6 octahedrons forming each horizontal and vertical side of the tunnel structure.

5 . The ruthenium adsorbent according to claim 1 , wherein the manganese oxides have an amorphous structure and/or α-MnO 2 and/or δ-MnO 2 .

6 . The ruthenium adsorbent according to claim 1 , wherein the manganese oxides have an amorphous structure and/or α-MnO 2 , and the aqueous solution comprises ruthenium in the form of a ruthenium cation.

7 . The ruthenium adsorbent according to claim 1 , wherein a content of manganese calculated as manganese dioxide is 50 parts by weight or more, based on 100 parts by weight of the adsorbent.

8 . The ruthenium adsorbent according to claim 1 , further comprising at least one additional transition metal element other than manganese.

9 . The ruthenium adsorbent according to claim 8 , wherein the at least one additional transition metal element is in the form of oxides thereof.

10 . The ruthenium adsorbent according to claim 9 , wherein manganese and the at least one additional transition metal element are present in the form of a physical mixture of manganese oxides and oxides of the at least one additional transition metal element.

11 . The ruthenium adsorbent according to claim 9 , wherein manganese and the at least one additional transition metal element are present in the form of composite oxides thereof.

12 . The ruthenium adsorbent according to claim 10 , wherein a weight ratio of manganese oxides to oxides of the at least one additional transition metal is 1:0.001 to 1:1, when the weight of the manganese oxides is calculated as the weight of manganese dioxide.

13 . The ruthenium adsorbent according to claim 11 , wherein the molar ratio of manganese to the at least one additional transition metal element is 1:0.001 to 1:1.

14 . The ruthenium adsorbent according to claim 8 , wherein the at least one additional transition metal element is selected from the group consisting of iron, cobalt, copper and zinc.

15 . The ruthenium adsorbent according to claim 1 , having a specific surface area of 70 to 700 m 2 /g.

16 . The ruthenium adsorbent according to claim 1 , in the form of a powder.

17 . The ruthenium adsorbent according to claim 1 , in the form of a shaped article.

18 . The ruthenium adsorbent according to claim 1 , further comprising an inorganic binder which comprises a metal element other than transition metals and/or a metalloid element.

19 . The ruthenium adsorbent according to claim 18 , wherein the inorganic binder comprises aluminum oxides or silicon oxides.

20 . (canceled)

21 . (canceled)

22 . A method for removing radioactive ruthenium from radioactive ruthenium-containing water, comprising contacting the radioactive ruthenium-containing water with the ruthenium adsorbent according to claim 1 .

23 . A method for removing ruthenium from ruthenium-containing water, comprising contacting the water with the ruthenium adsorbent according to claim 1 to oxidize ruthenium, wherein ruthenate ion-containing water is excluded from the ruthenium-containing water.

24 . The method according to claim 22 , wherein the water comprises sea water and/or water containing an ion selected from the group consisting of a sodium ion, a magnesium ion, a calcium ion, a chlorine ion and other ions, wherein the water is polluted with a radioactive element including radioactive ruthenium.

25 . A method for recovering ruthenium from waste fluid discharged from a production line for industrial products and/or a recycling process for industrial products, comprising contacting the waste fluid with the ruthenium adsorbent according to claim 1 , wherein the waste fluid contains ruthenium.

Assignees

• Clariant Catalysts Japan Kk
• Ebara Corp

Inventors

• Nakashima Tadahito
• Kim Hyun-Joong
• Sakuma Takashi
• Komatsu Makoto
• Izumi Takeshi

Classifications

• C02F1/28

  by sorption (using ion-exchange C02F1/42; sorbent compositions B01J) · CPC title

• C22B11/00

  Obtaining noble metals · CPC title

• B01J20/2803

  Sorbents comprising a binder, e.g. for forming aggregated, agglomerated or granulated products · CPC title

• B01J20/28011

  Other properties, e.g. density, crush strength · CPC title

• B01J20/28057

  Surface area, e.g. B.E.T specific surface area · CPC title