Adsorbent particles, base particle, packed column, and method for recovering rare-earth element
View Patent ↗Adsorbent particles each containing: a carrier particle containing an organic polymer containing a monomer unit derived from a styrene-based monomer; a hydrophilic organic compound adhered to a surface of the carrier particle; and a diglycolic acid residue bonded to the hydrophilic organic compound. When a BET specific surface of the adsorbent particles as determined by adsorption of nitrogen gas is X 0 and a BET specific surface area of the adsorbent particles as determined by adsorption of water vapor is X 1 , X 1 /X 0 is 0.10 to 1.0.
1. Adsorbent particles, each comprising:
a carrier particle comprising an organic polymer comprising a monomer unit derived from a styrene-based monomer;
a hydrophilic organic compound adhered to a surface of the carrier particle; and
a diglycolic acid residue bonded to the hydrophilic organic compound,
wherein when a BET specific surface area of the adsorbent particles as determined by adsorption of nitrogen gas is X 0 and a BET specific surface area of the adsorbent particles as determined by adsorption of water vapor is X 1 , X 1 /X 0 is 0.10 to 1.0.
2. The adsorbent particles according to claim 1 , wherein the carrier particle is a porous polymer particle.
3. The adsorbent particles according to claim 1 , wherein the hydrophilic organic compound is an amino group-containing polymer comprising a constituent unit having an amino group, and the diglycolic acid residue is bonded to the amino group.
4. The adsorbent particles according to claim 3 , wherein a quantity of the amino group in the adsorbent particles is 0.1 to 100 mmol per 1 g of the adsorbent particles.
5. The adsorbent particles according to claim 1 , wherein the adsorbent particles are configured to recover a rare earth element.
6. A packed column comprising: a column main body part; and the adsorbent particles according to claim 1 packed in the column main body part.
7. A method for recovering a rare earth element, the method comprising:
bringing a solution containing a rare earth element into contact with the adsorbent particles according to claim 1 and thereby causing the rare earth element to be adsorbed to the adsorbent particles; and
desorbing the rare earth element from the adsorbent particles by contact with an acidic solution containing an acid.
8. The method according to claim 7 , wherein an acid concentration of the acidic solution is 0.5 N or lower.
9. Base material particles, each comprising:
a carrier particle comprising an organic polymer comprising a monomer unit derived from a styrene-based monomer; and
a hydrophilic organic compound adhered to a surface of the carrier particle,
wherein when a BET specific surface area of the base material particles as determined by adsorption of nitrogen gas is Y 0 , and a BET specific surface area of the base material particles as determined by adsorption of water vapor is Y 1 , Y 1 /Y 0 is 0.05 to 1.0, and
wherein the base material particles are configured to form adsorbent particles comprising a diglycolic acid residue bonded to the hydrophilic organic compound.
10. The base material particles according to claim 9 , wherein the carrier particle is a porous polymer particle.
11. The base material particles according to claim 9 , wherein the hydrophilic organic compound is an amino group-containing polymer comprising a constituent unit having an amino group.
12. The base material particles according to claim 11 , wherein a quantity of the amino group in the base material particles is 0.1 to 100 mmol per 1 g of the base material particles.