Adsorbent precipitated on a carrier, method for producing said adsorbent, and use of said adsorbent

A method of producing an adsorbent precipitated on a support, which method comprises precipitating an inorganic adsorbent capable of Cs+ adsorption from a liquid medium onto a polymer-based spherical activated carbon serving as the support,

• wherein a synthetic polymer has been used to produce the activated carbon and wherein the activated carbon has the following characteristics:
• a Gurvich total pore volume of not less than 0.5 cm3/g, with not less than 50% of the total pore volume being formed by micropores having a pore diameter of not more than 20 Å,
• an average pore diameter of not more than 40 Å, and
• a BET surface area of not less than 1000 m2/g;
• wherein the method comprises the following steps:
• a)providing the polymer-based spherical activated carbon as the support;
• then either steps b1) and c1):
• b1) impregnating the support with an aqueous solution containing
• (i) hexacyanoferrate(II) or hexacyanoferrate(III) anions, and
• (ii) NH4+, Li+, Na+, K+ or Rb+;
• then
• c1) admixing the impregnated support with an aqueous solution of a salt of a di-, tri- or tetravalent metal cation,
• so as to obtain the inorganic adsorbent in the form of a complexed hexacyanoferrate(II) or a complexed hexacyanoferrate(III) and precipitated on the support;
• or alternatively steps b2) and c2):
• b2) impregnating the support with an aqueous solution of a salt of a di-, tri- or tetravalent metal cation,
• c2) admixing the impregnated support with an aqueous solution containing
• (i) hexacyanoferrate(II) or hexacyano ferrate(III) anions, and
• (ii)NH4+, Li+, Na+, K+ or Rb+;
• then
• so as to obtain the inorganic adsorbent in the form of a complexed hexacyanoferrate(II) or a complexed hexacyanoferrate(III) and precipitated on the support;
• then followed by:
• d) washing the support containing the precipitated adsorbent.