Synthesis of fibrous metal adsorbent by radiation-induced emulsion grafting of ethyl styrenesulfonate

スチレンスルホン酸エチルエステルを用いた放射線エマルショングラフト重合による繊維状金属吸着材の合成

植木 悠二; 瀬古 典明; 玉田 正男

Ueki, Yuji; Seko, Noriaki; Tamada, Masao

A fibrous metal adsorbent was synthesized by radiation-induced emulsion grafting of ethyl styrenesulfonate (ETSS) onto a polyethylene nonwoven fabric, followed by hydrolysis of the ETSS grafted chains to form styrenesulfonate grafted chains. The degree of grafting (Dg) could be controlled up to 810% (4.2 mmol-ETSS/g-adsorbent) by changing the pre-irradiation dose, ETSS concentration, grafting temperature and grafting time. The sulfonic acid (SOH) group density and conversion ratio of ETSS reached 3.7 mmol-SOH/g-adsorbent and 88%, respectively. The performance of the fibrous metal adsorbent was evaluated by batchwise adsorption test of Cu(II). The adsorption rates of the fibrous adsorbents were 11 to 205 times higher than that of commercial granular resin, depending on the Dg of adsorbents. The adsorption equilibrium times of adsorbents having Dg of 50%, 100%, 200%, 400% and 700% were 7, 20, 60, 90 and 130 min, respectively (granular resin: 24 h).