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素早く水をきれいにするフィルター

Filter for rapid purification of water

玉田 正男; 竹田 俊英*

Tamada, Masao; Takeda, Toshihide*

有機溶出分の少ないポリエチレン不織布に$$gamma$$線を照射し、グリシジルメタクリレートをグラフト重合後、化学処理を行ってスルホン基(-SO3H)導入した。得られた微量金属除去材料を10ppbのナトリウム水溶液で評価した結果、市販の吸着樹脂に比較して、2,000倍高速の400m/hの流速で除去材料体積の40,000倍のナトリウム水溶液を処理することが可能であった。また、除去材料からの有機溶出分は0.03ppb以下と極めて低いレベルであった。次に、界面活性剤を用いて、水にモノマー分散させることで、グラフト重合の効率を上げ、50kGyでの合成を可能とし、実用化の目処をつけることができた。

Glycidyl methacrylate (GMA) was grafted onto $$gamma$$-irradiated polyethylene nonwoven fabric which has low leaching of total organic carbon (TOC). The functional group of sulfonic acid was imparted by chemical treatment of grafted fabric. The resulting metal adsorbent removed sodium ion from 10 ppb solution with 400 m/L in linear velocity. This rate is 2000 times faster than that of commercialized adsorbent resins. The breakthrough point was 40,000 in bed volume and the eluted TOC was less than 0.03 ppb. The grafting was carried out by emulsion system to reduce the production cost. As a result, the cost could be reduced into the practical level since suitable dose for grafting was reduced to 50 kGy.

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