# US 2014/0151305 A1 · Adsorbent precipitated on a carrier, method for producing said adsorbent, and use of said adsorbent

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- Number: US 2014/0151305 A1
- Document ID: US20140151305A1
- Status: Published application
- Kind: A1
- Application number: 14/239,167
- Filed: 2012-08-02
- Published: 2014-06-05
- Earliest claimed: 2011-08-17
- Assignees: Blücher GmbH
- Inventors: Christian Schrage; Jann-Michael Giebelhausen; Sven Fichtner
- Web page: https://patentgrep.com/patent/US20140151305A1

## CPC

- C02F 1/281: {using inorganic sorbents}
- B01J 20/0211: {Compounds of Ti, Zr, Hf}
- B01J 20/0218: {Compounds of Cr, Mo, W}
- B01J 20/0225: {Compounds of Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt}
- B01J 20/0229: {Compounds of Fe}
- B01J 20/0237: {Compounds of Cu}
- B01J 20/024: {Compounds of Zn, Cd, Hg}
- B01J 20/0251: {Compounds of Si, Ge, Sn, Pb (B01J20/10 takes precedence)}
- B01J 20/0292: {Phosphates of compounds other than those provided for in B01J20/048}
- B01J 20/04: comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J 20/041: {Oxides or hydroxides}
- B01J 20/20: comprising free carbon; comprising carbon obtained by carbonising processes
- B01J 20/28019: {Spherical, ellipsoidal or cylindrical}
- B01J 20/28066: {being more than 1000 m2/g}
- B01J 20/28069: {Pore volume, e.g. total pore volume, mesopore volume, micropore volume}
- B01J 20/28078: {Pore diameter}
- B01J 20/3071: {Washing or leaching}
- B01J 20/3204: {Inorganic carriers, supports or substrates}
- B01J 20/3236: {containing metal, other than zeolites, e.g. oxides, hydroxides, sulphides or salts}
- B05D 1/36: Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- C02F 1/288: {using composite sorbents, e.g. coated, impregnated, multi-layered}
- G21F 9/12: by absorption; by adsorption; by ion-exchange
- C02F 2101/20: Heavy metals or heavy metal compounds
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- G21F: PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR (radiation protection by pharmaceutical means A61K8/00, A61Q17/04; in cosmonautic vehicles B64G1/54; combined with a reactor G21C11/00; combined with X-ray tubes H01J35/16; combined with X-ray apparatus H05G1/02)

## Abstract

The invention relates to an adsorbent precipitated on a carrier and to a method for producing said adsorbent. The carrier comprises a polymer-based spherical activated charcoal. The adsorbent comprises an inorganic precipitate capable of adsorbing a metal cation or a mixture of metal cations from a liquid, preferably aqueous, medium. The adsorbent precipitated on a carrier is used to remove, for example, Cs+ from water containing Cs+, in particular from water contaminated with radiotoxic 137Cs+.

## Claims

### Claim at position 1

1-8. (canceled)

### Claim 9

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.

### Claim 10 (depends on 9)

The method as claimed in claim 9, wherein step d) is followed by a step e) comprising drying the washed support resulting from step d) and containing the precipitated adsorbent.

### Claim 11 (depends on 9)

The method as claimed in claim 9, wherein the polymer-based spherical activated carbon is a porous activated carbon having pores with a minimum average pore diameter of not less than 5 Å.

### Claim 12 (depends on 9)

The method as claimed in claim 9, wherein the divalent metal cation is Cd2+, Co2+, Cu2+, Ni2+, Zn2+, Sn2+ or Fe2+.

### Claim 13 (depends on 9)

The method as claimed in claim 9, wherein the trivalent metal cation is Cr3+ or Fe3+.

### Claim 14 (depends on 9)

The method as claimed in claim 9, wherein the tetravalent metal cation is Sn4+, Ti4+ or Zr4+.

### Claim 15 (depends on 9)

A support-precipitated adsorbent obtained by a method as claimed in claim 9.

### Claim 16 (depends on 15)

A method of using the support-precipitated adsorbent as claimed in claim 15, for removing a metal cation or a mixture of metal cations from water.

### Claim 17 (depends on 15)

A method of using the support-precipitated adsorbent as claimed in claim 15, for removing Cs+ from Cs+-containing water.