Improvement in Impregnation Percentage of Sodium Titanate of Adsorptive Fiber for Strontium through Repetitive Immobilization of Peroxotitanium Complex Anions to Anion-Exchange Fiber

Abstract

To prepare adsorptive fiber capable of capturing strontium ions dissolved in seawater at high capacity, peroxotitanium complex (POTC) anions as precursor of sodium titanate were immobilized by repetitive immersion of dimethylaminoethyl methacrylate (DMAEMA)-grafted fiber in a POTC anion-containing solution. Through ten-times immobilization of POTC anions and their conversion into sodium titanate, impregnation percentage of the fiber amounted to 29％, which was approximately 1.6-fold higher than once immobilization and impregnation. A binding capacity of the resultant fiber in artificial seawater for strontium ions was raised up to 2.9 mg-Sr per gram of the fiber.