Adsorption of metals by adsorbent containing hydroxamic acid groups synthesized by radiation induced graft polymerization

放射線グラフト重合法により作製したヒドロキサム酸型吸着材による金属吸着

Phiriyatorn, S.*; 保科 宏行; 瀬古 典明; 玉田 正男

Phiriyatorn, S.*; Hoshina, Hiroyuki; Seko, Noriaki; Tamada, Masao

An adsorbent containing hydroxamic acid groups was synthesized by radiation-induced graft polymerization of methyl acrylate (MA) onto nonwoven fabric composed of polyethylene-coated polypropylene fiber. Graft polymerization was carried out in emulsified MA solution containing sodium dodecyl sulfate as an emulsifier in the presence of water. Conversion of the ester groups in the grafted MA moiety into the hydroxamic groups was performed by treatment with an alkaline solution of hydroxylamine. The adsorbent containing hydroxamic acid groups was investigated. The adsorbent (approximately 0.01g) can adsorb 99% of U, 99% of V, 97% of Cd, and 97% of Pb at pH, 5, 4, 7, and 6 respectively after contacted with 100 ml of 100 ppb metal solution for 24 hour. The breakthrough capacities were 1000, 1100, 5300, and 7600 bed volume for Cd, V, U, and Pb, respectively with 100 ppb metal solution at the space velocity of 200 h. These values correspond to 0.006, 0.013, 0.014, and 0.022 mmol/g-adsorbent. The selectivity for metal ions of hydroxamic acid type adsorbent was Pb U V Cd.