Repeated Deposition of Titanium Compounds onto 6-Nylon Fiber for Removal of Strontium from Seawater

• Published in: Bulletin of the Society of Sea Water Science, Japan Vol. 68; no. 4; pp. 258 - 263
• Main Authors: KONO, Michitaka, UMINO, Satoshi, FUJIWARA, Kunio, SUGO, Takanobu, KOJIMA, Takashi, UMENO, Daisuke, SAITO, Kyoichi
• Format: Journal Article
• Language: Japanese
• Published: The Society of Sea Water Science, Japan 2014
• Subjects: Repeated deposition; Sodium titanate-impregnated fiber; Strontium removal; Titanium hydroxide
• ISSN: 0369-4550; 2185-9213
• DOI: 10.11457/swsj.68.258

Titanium hydroxide (TiO2・xH2O) was impregnated by repeated reaction of titanium ionic species-bound cation-exchange fiber with sodium hydroxide (NaOH) solution. The amount of titanium hydroxide deposited increased with an increase in the repeated number of deposition. The TiO2・xH2O-impregnated fiber was treated with NaOH in a mixture of methanol and H2O to convert titanium hydroxide into sodium titanate (NaxTiyOz). After the ninth repetition, an the impregnation percentage calculated from the mass ratio of sodium titanate to the cation-exchange fiber amounted to 110 ％. The amount of strontium adsorbed onto the fiber prepared by the ninth repetition rose to 0.86 mg-Sr per g of the fiber, which was almost equivalent to that of a commercially available strontium adsorbent. The selectivity of Sr over Mg increased with the repetition number of titanium hydroxide deposited onto the fiber, whereas that of Sr over Ca remained constant irrespective of it.