Impregnation of Sodium Titanate onto DMAPAA-Grafted Fiber under Mild Reaction Conditions and Its Strontium Removal Performance from Seawater

• Published in: Bulletin of the Society of Sea Water Science, Japan Vol. 69; no. 4; pp. 270 - 276
• Main Authors: KATAGIRI, Mizuki, KONO, Michitaka, GOTO, Shun-ichi, FUJIWARA, Kunio, SUGO, Takanobu, KAWAI-NOMA, Shigeko, UMENO, Daisuke, SAITO, Kyoichi
• Format: Journal Article
• Language: Japanese
• Published: The Society of Sea Water Science, Japan 2015
• Subjects: DMAPAA-grafted fiber; Impregnation; Seawater; Sodium titanate; Strontium removal
• ISSN: 0369-4550; 2185-9213
• DOI: 10.11457/swsj.69.270

Sodium titanate was impregnated onto a commercially available 6-nylon fiber by means of radiation-induced graft polymerization of dimethyaminopropyl acrylamide（DMAPAA）and subsequent chemical modifications. A peroxo complex of titanium anions was bound onto the DMAPAA-grafted fiber before the bound titanium species was converted to sodium titanate through precipitation with sodium hydroxide. Impregnation percentage of sodium titanate of the fiber was constant at 20 ％ in the range of sodium hydroxide concentration in a mixture of methanol and water at a volume fraction of methanol of 80 ％ of 0.001 to 1 M, whereas the removal percentage of strontium from seawater leveled off at 80 ％ above a sodium hydroxide concentration in water of 0.1 M. Determination of adsorption isotherms in seawater demonstrates that the sodium-titanate-impregnated fiber with an impregnation percentage of 10 ％ exhibited 2.6-fold higher amount of strontium adsorbed in seawater per g of sodium titanate（8.8 mg-Sr/g）than a commercially available granular adsorbent for strontium, SrTreat®（3.4 mg-Sr/g）.