What is provided is a layered double hydroxide crystal for achieving higher ion-exchange capacity than that of the related art. The layered double hydroxide crystal 1 according to the present embodiment is represented by Formula (1) and composed of a plurality of crystal grains 10 each of which has a lamination structure in which a plurality of plate-shaped crystals (11), (11), . . . are laminated, in which particle sizes of the plurality of crystal grains (10), (10), . . . are uniform on a microscale.
[Ni.sup.2+.sub.1xFe.sup.3+.sub.x(OH).sub.2].Math.[(Cl.sup.).sub.X/2](1) (Where, 0.25

What is provided is a layered double hydroxide crystal for achieving higher ion-exchange capacity than that of the related art. The layered double hydroxide crystal 1 according to the present embodiment is represented by Formula (1) and composed of a plurality of crystal grains 10 each of which has a lamination structure in which a plurality of plate-shaped crystals (11), (11), . . . are laminated, in which particle sizes of the plurality of crystal grains (10), (10), . . . are uniform on a microscale.
[Ni.sup.2+.sub.1xFe.sup.3+.sub.x(OH).sub.2].Math.[(Cl.sup.).sub.X/2](1) (Where, 0.25

Processes for purifying polyether polyols via treatment with ion exchange resins. A mixture that includes the polyether polyol and alkali metal ions is passed through a first bed that includes a cation exchange resin comprising carboxylic acid and/or phosphonic acid groups to remove alkali metal ions from the mixture. Thereafter, the product is passed through a second bed comprising an anion exchange resin comprising quaternary ammonium groups and a cation exchange resin comprising carboxylic acid and/or phosphonic acid groups to thereby produce a purified polyether polyol.

Processes for purifying polyether polyols via treatment with ion exchange resins. A mixture that includes the polyether polyol and alkali metal ions is passed through a first bed that includes a cation exchange resin comprising carboxylic acid and/or phosphonic acid groups to remove alkali metal ions from the mixture. Thereafter, the product is passed through a second bed comprising an anion exchange resin comprising quaternary ammonium groups and a cation exchange resin comprising carboxylic acid and/or phosphonic acid groups to thereby produce a purified polyether polyol.

The disclosure relates to a process for producing magnesium hydrogen carbonate and/or calcium hydrogen carbonate. An anion exchanger loaded with bicarbonate ions is provided, and a solution containing magnesium salt and/or calcium salt is then passed through the anion exchanger.

The disclosure relates to a process for producing magnesium hydrogen carbonate and/or calcium hydrogen carbonate. An anion exchanger loaded with bicarbonate ions is provided, and a solution containing magnesium salt and/or calcium salt is then passed through the anion exchanger.

Methods and materials are described for the removal of iodate from aqueous solutions. The methods comprise reduction of the iodate to iodide and subsequent or concurrent removal of the iodide by sorption, ion exchange, or precipitation. These methods are effective for the removal of radioactive iodine from radioactive and nuclear wastes.

Methods and materials are described for the removal of iodate from aqueous solutions. The methods comprise reduction of the iodate to iodide and subsequent or concurrent removal of the iodide by sorption, ion exchange, or precipitation. These methods are effective for the removal of radioactive iodine from radioactive and nuclear wastes.

A process for producing a coated membrane for an anionic exchange membrane electrode assembly includes mixing a PGM-free catalyst, an ionomer, and an anhydrous solvent forming a solution, coating a non-fluorinated substrate with the solution forming a coated substrate and drying the coated substrate allowing the anhydrous solvent to evaporate forming a dried coated substrate. The dried coated non-fluorinated substrate is applied to a surface of a hydroxyl-free anion-exchange membrane including non-hydroxyl ions forming a membrane substrate assembly that is pressed using a hot-press. The substrate is removed from the pressed membrane substrate assembly forming a coated membrane. The non-hydroxyl ions in the anionic exchange membrane are replaced by hydroxyl ions by soaking the coated membrane in a hydroxyl ion solution.

A process for producing a coated membrane for an anionic exchange membrane electrode assembly includes mixing a PGM-free catalyst, an ionomer, and an anhydrous solvent forming a solution, coating a non-fluorinated substrate with the solution forming a coated substrate and drying the coated substrate allowing the anhydrous solvent to evaporate forming a dried coated substrate. The dried coated non-fluorinated substrate is applied to a surface of a hydroxyl-free anion-exchange membrane including non-hydroxyl ions forming a membrane substrate assembly that is pressed using a hot-press. The substrate is removed from the pressed membrane substrate assembly forming a coated membrane. The non-hydroxyl ions in the anionic exchange membrane are replaced by hydroxyl ions by soaking the coated membrane in a hydroxyl ion solution.