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Tomohito Kameda,Tetsu Shinmyou,Toshiaki Yoshioka 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.36 No.-
1-Hydroxyethane-1,1-diphosphonic acid intercalated Li–Al layered double hydroxide (HEDP Li–Al LDH)was prepared by co-precipitation. HEDP Li–Al LDH was found to take up Nd3+ and Sr2+ ions from aqueoussolutions; this can be attributed to the metal-chelating functions of the HEDP ions in the interlayers ofHEDP Li–Al LDH. Sr2+ uptake by HEDP Li–Al LDH was larger than Nd3+ uptake. This is probably becausethe uptake of one mole of Nd3+ by HEDP Li–Al LDH requires two times the number of moles of HEDP ionsthan the uptake of one mole of Sr2+. The mass-transfer-controlled shrinking core model described theuptake behavior better than the surface reaction-control model. HEDP ions in the HEDP Li–Al LDHinterlayer rapidly form chelate complexes with Nd3+ or Sr2+, as a result of which the transfer of Nd3+ orSr2+ through the product layer is rate limiting. Furthermore, this reaction mechanism can be described bya Langmuir-type adsorption phenomenon, indicating that this reaction involves chemical adsorption;this is consistent with the formation of chelate complexes between Nd3+ or Sr2+ and HEDP ions in theinterlayers of HEDP Li–Al LDH. The control of chelate ions in the interlayer of Li–Al LDH leads to thecontrol of the preferential uptake of metal ions.