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irradiationSuwanmala, P.*; Hemvichian, K.*; 保科 宏行; Srinuttrakul, W.*; 瀬古 典明
Radiation Physics and Chemistry, 81(8), p.982 - 985, 2012/08
被引用回数：12 パーセンタイル：66.47(Chemistry, Physical)Metal adsorbent containing hydroxamic acid groups was successfully synthesized by radiation-induced graft copolymerization of methylacrylate onto cassava starch. The optimum conditions for grafting were studied in terms of % degree of grafting (Dg). Conversion of the ester groups present in poly(methyl acrylate)-grafted-cassava starch copolymer into hydroxamic acid was carried out by treatment with hydroxylamine in the presence of alkaline solution. The adsorbent of 191%Dg had total adsorption capacities of 2.6, 1.5, 1.4, 1.2 and 1.6 mmol/g-adsorbent for Cd
, Al
, UO
, V
, and Pb, respectively, in the batch mode adsorption.
Suwanmala, P.*; 保科 宏行; 瀬古 典明; 玉田 正男
no journal, ,
放射線グラフト重合法を用いてポリエチレン製の不織布にメチルアクリレート(MA)をグラフトしたのち、ヒドロキサム酸基に転化して金属吸着材を作製した。吸着材の合成条件を最適化した結果、グラフト率120%を得るために必要な反応条件は、MA濃度2%,ドデシル硫酸ナトリウム濃度0.1%,照射線量20kGy,反応時間1h,反応温度40度であった。また、転化反応条件はヒドロキシルアミン濃度20%,メタノールと水の混合比5:1,pH13,反応時間1hであった。得られた金属吸着材(ヒドロキサム酸基密度:3.8mmol/g)を用いてバッチ吸着試験を行った結果、100ppbの各金属溶液(ウラン,バナジウム,鉛,アルミニウム,カドミウム)中で24h浸漬させることにより、すべての金属を96%以上吸着可能であった。また、金属吸着選択性は鉛
ウランカドミウムバナジウムの順となった。
保科 宏行; Suwanmala, P.*; 瀬古 典明; 玉田 正男
no journal, ,
A new adsorbent containing hydroxamic acid groups was synthesized by radiation induced graft polymerization. First, methyl acrylate (MA) was grafted onto nonwoven fabric composed of polyethylene-coated polypropylene fiber. The resultant polymer was immersed in the hydroxylamine solution to convert the methoxy groups to hydroxamic acid groups. Graft polymerization was carried out in MA emulsion solution with sodium dodecyl sulfate as a surfactant. The adsorbent was treated by NaOH before adsorption test. The adsorbent containing hydroxamic acid groups can adsorb 94% of Al, 96% of V, 97% of Pb, and 97% of U at pH 6 after contacted with 100 ppb metal mixture solution for 24 hours. The distribution co-efficiencies were 1.6
10
, 2.410, 3.210 and 3.210 for Al, V, Pb and U, respectively. The hydroxamic acid adsorbent is concluded to be a excellent affinity towards chelation with various metals.
