Chromium(VI) adsorption-reduction using a fibrous amidoxime-grafted adsorbent

グラフト重合させた繊維状アミドキシム吸着剤による六価クロムの吸着還元反応

林 菜月*; 松村 大樹   ; 保科 宏行*; 植木 悠二*; 辻 卓也  ; Chen, J.*; 瀬古 典明*

Hayashi, Natsuki*; Matsumura, Daiju; Hoshina, Hiroyuki*; Ueki, Yuji*; Tsuji, Takuya; Chen, J.*; Seko, Noriaki*

To develop a safe and simple method for the reduction of toxic chromium(VI) to the less harmful chromium(III), we proposed using radiation-induced graft polymerization. This method allows for any functional group to be introduced into conventional polymeric materials. Herein, we synthesized a fibrous adsorbent with amidoxime functional groups that have a high affinity for chromium, and investigated the changes in the chromium valence state over time in the amidoxime-grafted adsorbent. In situ X-ray absorption fine structure analysis revealed that most of the chromium(VI) was reduced to chromium(III) relatively early during the adsorption process, followed by gradual changes in the bonding structure of the amidoxime-chromium complex. It is expected to contribute to the development of practical technologies for wastewater treatment.