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

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  • DMAPAAグラフト繊維へのチタン酸ナトリウムの穏和な反応条件下での担持と得られた繊維を使う海水からのストロンチウムの除去
  • DMAPAA グラフト センイ エ ノ チタンサン ナトリウム ノ オンワ ナ ハンノウ ジョウケン カ デ ノ タンジ ト エラレタ センイ オ ツカウ カイスイ カラ ノ ストロンチウム ノ ジョキョ

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Abstract

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）.

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