Disclosed is a method of exchanging the anions of inorganic halide perovskite nanoparticles using cationic effect. More particularly, the method is a cation effect-based anion exchange method of being capable of improving optical stability while controlling the optical band energy of CsPbBr.sub.3 perovskite nanoparticles at room temperature. According to an embodiment of the present disclosure, a cation-anion pair suitable for anion exchange and stability improvement can be provided.

The invention relates to sulfonated aminomethylated chelate resins, to a method for producing same, to the use thereof for obtaining and purifying metals, in particular rare earth metals, from aqueous solutions and organic liquids, and for producing highly pure silicon.

Methods for producing ferric maltol compositions, such as ferric trimaltol, from elemental iron, and ferric maltol compositions produced by these methods and their uses are described.

Systems for separating Ra from a mixture comprising at least Ra, Pb, Bi, and Th are provided. The systems can include: a first vessel housing a first media and Th or Bi; a second vessel in fluid communication with the first vessel, the second vessel housing a second media and Pb; and a third vessel in fluid communication with the second vessel, the third vessel housing a third media and Ra, wherein at least one of the first, second, or third medias are different from the other media.

Methods for separating Ra from Pb, Bi, and Th are provided, the methods can include: providing a first mixture comprising Ra, Pb, Bi, and/or Th; providing a system that can include: a first vessel housing a first media; a second vessel in fluid communication with the first vessel, the second vessel housing a second media; and a third vessel in fluid communication with the second vessel, the third vessel housing a third media; and exposing the first mixture to the first media within the first vessel then, through the fluid communication, exposing the first remainder to the second media in the second vessel, then, through fluid communication, exposing the next remainder to the third media in the third vessel, the exposing separating the Th and Bi from the Ra and Pb, and the Ra from the Pb.

Methods for separating Ra from being associated with a media are also provided. The methods can include: exposing the Ra and media to a chelating agent to form a mixture comprising the Ra complexed with the chelating agent.

Methods for producing ferric maltol compositions, such as ferric trimaltol, from elemental iron, and ferric maltol compositions produced by these methods and their uses are described.

Methods for separating Ra from Pb, Bi, and Th are provided, the methods can include: providing a first mixture comprising Ra, Pb, Bi, and/or Th; providing a system that can include: a first vessel housing a first media; a second vessel in fluid communication with the first vessel, the second vessel housing a second media; and a third vessel in fluid communication with the second vessel, the third vessel housing a third media; and exposing the first mixture to the first media within the first vessel then, through the fluid communication, exposing the first remainder to the second media in the second vessel, then, through fluid communication, exposing the next remainder to the third media in the third vessel, the exposing separating the Th and Bi from the Ra and Pb, and the Ra from the Pb. Methods for separating Ra from being associated with a media are also provided. The methods can include: exposing the Ra and media to a chelating agent to form a mixture comprising the Ra complexed with the chelating agent.

The invention relates to sulfonated aminomethylated chelate resins, to a method for producing same, to the use thereof for obtaining and purifying metals, in particular rare earth metals, from aqueous solutions and organic liquids, and for producing highly pure silicon.

The disclosure belongs to the field of preparation of radioisotopes for medical uses and relates to a method for extracting lead-212 and bismuth-212 from a thorium-232 decay chain, including: passing a solution containing thorium-232 decay chain substance through an anion exchange resin column, the solution containing thorium-232 decay chain substance containing halogen ions, and a concentration of hydrogen ions in the solution containing thorium-232 decay chain substance being more than 0.01 mol/L, lead-212 and bismuth-212 being adsorbed by the anion exchange resin column and other nuclides passing through the anion exchange resin column without being adsorbed; and introducing eluting agents to desorb lead-212 and bismuth-212 from the anion exchange resin column, so as to obtain lead-212 and bismuth-212 by separation and extraction. The disclosure can simultaneously extract lead-212 and bismuth-212 with a high extraction speed and high purity, and is not easy to cause organic pollution of products.