ADSORBENT AND METHOD FOR MANUFACTURING CRYSTALLINE SILICOTITANATE

摘要

There are provided an adsorbent material excellent in the adsorptive removal properties of Cs and Sr also in seawater, and a method for producing a crystalline silicotitanate suitable for the adsorbent material. The adsorbent material according to the present invention comprises: at least one selected from crystalline silicotitanates represented by Na 4 Ti 4 Si 3 O 16 ·nH 2 O, (Na x K (1-x) 4Ti 4 Si 3 O 16 ·nH 2 O and K 4 Ti 4 Si 3 O 16 ·nH 2 O wherein x represents a number of more than 0 and less than 1 and n represents a number of 0 to 8; and at least one selected from titanate salts represented by Na 4 Ti 9 O 20 ·mH 2 O, (Na y K (1-y) ) 4 Ti 9 O 20 ·mH 2 O and K 4 Ti 9 O 20 ·mH 2 O wherein y represents a number of more than 0 and less than 1 and m represents a number of 0 to 10. The adsorbent material is suitably produced by a method for producing a crystalline silicotitanate in which a silicic acid source, a sodium compound and/or a potassium compound, titanium tetrachloride, and water are mixed to obtain a mixed gel, and the mixed gel is subjected to a hydrothermal reaction.