Two-dimensional material for removal of anions and applications thereof

Patent metadata

Field	Value
Publication number	US-11154851-B2
Application number	US-201816227336-A
Country	US
Kind code	B2
Filing date	Dec 20, 2018
Priority date	Nov 26, 2018
Publication date	Oct 26, 2021
Grant date	Oct 26, 2021

Abstract

A method for preparing an anion adsorbent may be provided, which comprises the steps of: mixing at least two metal salts with each other, thereby forming a stack structure in which cationic compound layers and anionic compound layers containing anions and water of crystallization are alternately stacked on one another; performing a first heat treatment on the stack structure to expand between the cationic compound layers, thereby preparing a preliminary anion adsorbent; and performing a second heat treatment on the preliminary anion adsorbent to remove the anions and the water of crystallization from the anionic compound layers while allowing at least one of the anions to remain, thereby preparing the anion adsorbent.

First claim

What is claimed is:

1. An anion adsorbent comprising:
a plurality of spaced cationic layers;
at least one anion that provides coupling between each adjacent two of the cationic layers; and
an empty space between each adjacent two of the cationic layers,
wherein a volume occupied by the empty space in a space provided between each adjacent two of the cationic layers is greater than a volume occupied by the at least one anion; and
wherein a distance between the two adjacent cationic layers where the at least one anion provides coupling is shorter than a distance between the two adjacent cationic layers forming the empty space.

2. The anion adsorbent of claim 1 , wherein the at least one anion is randomly provided between each adjacent two of the cationic layers.

3. The anion adsorbent of claim 1 , wherein the at least one anion is arranged in the empty space between each adjacent two of the cationic layers.

4. The anion adsorbent of claim 1 , wherein an externally supplied target anion is adsorbed into the empty space.

5. The anion adsorbent of claim 1 , wherein the target anion is a toxic anion in wastewaters, including steelmaking wastewater, plating wastewater, household waste, and livestock waste.

6. The anion adsorbent of claim 1 , wherein the at least one anion includes a monovalent, divalent, or trivalent anion, and the cationic layers comprise at least two metal ions, in which the metal ions comprise a divalent metal ion and a trivalent metal ion.

7. The anion adsorbent of claim 1 , wherein the plurality of cationic layers and the at least one anion are alternately stacked on one another.

8. The anion adsorbent of claim 4 , wherein
a cation in the cationic layers comprises one or more of Mg 2+ , Al 3+ , Ca 2+ , and Fe 3+ , and
the target anion comprises one or more of CN − , Cl − , F − , OH − , Br − , NO 3 − , NO 2 − , HCO 3 − , B(OH) 4 − , PO 4 3− , HPO 4 2− , SO 4 2− , Ni(CN) 4 2− , CO 3 2− , [M 1 (CN) 6 ] 3− (M 1 =Ti, V, Cr, Mn, Fe, or Co), [M 2 (CN) 4 ] 2− (M 2 =Ni, Pd, or Pt), and [M 3 (CN) 2 ] − (M 3 =Cu, Ag, or Au).

Assignees

• Iucf Hyu Erica Campus

Inventors

• Choa Yong-Ho
• Lee Han-Seung
• Cho Hong-Baek
• Song Yoseb
• Yoo Su-Bean
• Park Ji Young

Classifications

• B01J41/02 Primary

  Processes using inorganic exchangers · CPC title

• B01J20/0277 Primary

  Carbonates of compounds other than those provided for in B01J20/043 · CPC title

• C01F7/784

  Layered double hydroxide, e.g. comprising nitrate, sulfate or carbonate ions as intercalating anions · CPC title

• C01F7/785

  Hydrotalcite · CPC title

• C02F1/281

  using inorganic sorbents · CPC title