Chromatographic fractionation of lithium isotope in aqueous solution using bifunctional ion-exchange resin

Crown ether-type organic composite adsorbents embedded in high-porous silica beads for simultaneous recovery of lithium and uranium in seawater

“…We found that PK208, PK216, PK220, PK228, PK228L, and SK112L resins with a sulfo group, WK10 and WK40L resins with a carboxylic group, and CR10 type chelating resin with two carboxylic groups have little adsorption ability for Li ion in seawater although the porous-type sulfonated styrene-divinylbenzene resins are often used in the Li isotope separation research (see Fig. 3) [3,8,30]. These results imply that the Li adsorption reactions are interfered by other elements in seawater.…”

“…The aqueous solution of 1 wt% HNO3 was used as a diluent for all ICP/MS and AAS measurements. This procedure has been constructed by reference to the literature [8]. These adsorbents do not adsorb Clion which exists in seawater as anion species.…”

“…in seawater. Therefore, if innovative Li recovery technology is acquired, the maldistribution and the rapid depletion of Li resources would ideally be relaxed [7,8]. It is very interesting for chemists to develop selective recovery adsorbents, etc.…”

“…It is very interesting for chemists to develop selective recovery adsorbents, etc. for Li ion in seawater [5,[7][8][9][10]. The foregoing Li recovery processes using ion exchange and complexation reactions are very simple but the Li adsorption capacities of them are not so high or some adsorbents may dissolve into seawater by long immersion time.…”

A Comprehensive Review of Selected Major Categories of Lithium Isotope Separation Techniques

“…[ 53 ] In addition, the crown ethers anchored on Merrifield peptide resin have also improved the separation efficiency. [ 54 ] The influence of bifunctional groups in the sulfonated styrene–divinylbenzene resin embedded in porous silica beads to suppress the swelling and shrinking of the resin and improve the mechanical strength was investigated by Tachibana et al [ 55 ] They concluded that the crosslinkage of resins is generally not inherently proportional to the separation factor and that the hydrophobicity of resins is one of the most significant parameters for increasing the separation factor. A novel lithium isotope separation polymer polysulfone (PSF)‐graft‐4′‐aminobenzo‐15‐crown‐5‐ether (AB15C5) (PSF‐g‐AB15C5) was prepared from PSF and AB15C5 as starting materials through nucleophilic substitution reaction by Yan et al, [ 56 ] as shown in Figure a.…”