POROUS BODY, ADSORBENT INCLUDING THE POROUS BODY, AND METHOD OF REMOVING METAL AND/OR METAL ION WITH THE ADSORBENT
An object of the present invention is to provide a porous body having excellent adsorption performance, an adsorbent including the porous body, and a method of removing a metal and/or a metal ion from a liquid to be treated, with the adsorbent, and in order to achieve the object, the present invention provides a porous body having a co-continuous structure formed by: a ceramic skeleton ( 1 ) including mesopores ( 3 ); and macropores ( 2 ), wherein a surface of the ceramic skeleton ( 1 ) is modified with a nitrogen atom-containing group and a phosphorus atom-containing group, and wherein a total amount of the nitrogen atom-containing group and the phosphorus atom-containing group contained in the porous body is 0.5 mmol/g or more and 6.0 mmol/g or less.
1 . A porous body having a co-continuous structure formed by: a ceramic skeleton comprising mesopores; and macropores,
wherein a surface of the ceramic skeleton is modified with a nitrogen atom-containing group and a phosphorus atom-containing group, and
wherein a total amount of the nitrogen atom-containing group and the phosphorus atom-containing group contained in the porous body is 0.5 mmol/g or more and 6.0 mmol/g or less.
2 . The porous body as claimed in claim 1 , wherein a first compound containing the nitrogen atom-containing group and the phosphorus atom-containing group is fixed to the surface of the ceramic skeleton, so that the surface of the ceramic skeleton is modified with the nitrogen atom-containing group and the phosphorus atom-containing group.
3 . The porous body as claimed in claim 1 , wherein a second compound containing the nitrogen atom-containing group and a third compound containing the phosphorus atom-containing group are fixed to the surface of the ceramic skeleton, so that the surface of the ceramic skeleton is modified with the nitrogen atom-containing group and the phosphorus atom-containing group.
4 . The porous body as claimed in claim 1 , wherein the nitrogen atom-containing group is selected from a primary amino group, a secondary amino group, a tertiary amino group, a quaternary ammonium group, an imino group, and a nitrilo group.
5 . The porous body as claimed in claim 1 , wherein the phosphorus atom-containing group is selected from a phosphinate group, a phosphonate group, a phosphate group, a phosphinous acid group, a phosphonous acid group, a phosphite group, a phosphine group, and a phosphine oxide group.
6 . The porous body as claimed in claim 1 , wherein a mole ratio of an amount of the phosphorus atom-containing group contained in the porous body to an amount of the nitrogen atom-containing group contained in the porous body is 0.5 or more and 2.5 or less.
7 . The porous body as claimed in claim 1 , wherein the ceramic skeleton contains an element selected from silicon, aluminum, tin, cerium, titanium, and zirconium.
8 . An adsorbent for metal and/or metal ion recovery comprising the porous body as claimed in claim 1 .
9 . The adsorbent as claimed in claim 8 , wherein the metal is selected from: transition metals including rare earth metals; and typical elements of Group 12 to Group 15, and the metal ion is selected from: transition metal ions including rare earth metal ions; and typical element ions of Group 12 to Group 15.
10 . A method of removing a metal and/or a metal ion from a solution containing the metal and/or the metal ion, the method comprising a step of contacting the solution with the adsorbent as claimed in claim 8 .
11 . The method as claimed in claim 10 , wherein the metal is selected from: transition metals including rare earth metals; and typical elements of Group 12 to Group 15, and the metal ion is selected from: transition metal ions including rare earth metal ions; and typical element ions of Group 12 to Group 15.