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柴田 卓弥; 瀬古 典明; 笠井 昇; 保科 宏行; 植木 悠二
International Journal of Organic Chemistry, 5(2), p.100 - 107, 2015/06
To obtain the safety of drinking water, an antibacterial material was prepared by loading Ag onto fibrous iminodiacetate (IDA) adsorbent, which was synthesized by radiation induced graft polymerization of a glycidyl methacrylate and subsequent chemical modification of the produced epoxy group to an IDA group(IDA-Ag). A total amount of loaded Ag on the IDA-Ag fabric was 0.4 mmol-Ag/g-fabric. As a result of evaluating antibacterial effects by the column mode water flow test with a stream water, the effective Ag concentration was monitored 0.05 ppm at irrespective of flow rate which was functioned to the antibacterial performance. The antibacterial effects for general bacteria were indicated until BV (BV: steam water volume/IDA-Ag fabric volume) 6,000, and for colitis germ legions were completely disinfected until BV 6,000.
保科 宏行; 植木 悠二; 佐伯 誠一; 瀬古 典明
International Journal of Organic Chemistry, 4(3), p.195 - 200, 2014/09
2-Ethylhexyl hydrogen-2-ethylhexylphosphonate (EHEP) is commonly used as a metal extractant because it has a particular affinity for rare-earth metals like Scandium (Sc). To develop a highly-selective polymeric adsorbent of Sc(III), EHEP was introduced as a functional group onto a polyethylene fabric with radiation-induced graft polymerization (RIGP). The adsorption performances for Sc(III) were evaluated in aqueous solutions containing Sc(III) and Fe(III) by a column test. The adsorption capacities of Sc(III) and Fe(III) until the bed volume reached 5000 were 5.22 and 0.12 mg/g, respectively. The adsorbents showed 44 times higher Sc(III) adsorption capacity than that of Fe(III). These results indicated that the grafted adsorbent containing EHEP had an extremely high selectivity for Sc(III) adsorption.
植木 悠二; 佐伯 誠一; 柴田 卓弥; 保科 宏行; 笠井 昇; 瀬古 典明
International Journal of Organic Chemistry, 4(2), p.91 - 105, 2014/06
第4級アミン基を有する繊維状グラフト重合体は、高性能なバイオディーゼル燃料(BDF)製造用触媒として機能する。本研究では、効率的なBDF製造を可能とする繊維状グラフト重合体、及び、エステル交換反応条件の最適化を実施した。触媒性能は、トリグリセリド(TG)とエタノール(EtOH)とのバッチ式エステル交換反応により評価した。触媒に導入する最適アミノ基はトリメチルアミンであり、最適グラフト率は170%であった。エステル交換反応における各要素の最適条件を検討した結果、アミン基導入量は0.8mmol、反応温度は80
C、TGとEtOHの混合比率は1:200、アルコールは1-ペンタノールでることを見出した。また、本触媒は天然油脂を出発原料とするBDF製造にも適用可能であった。更に、有機酸処理、アルカリ処理、アルコール処理を順次実施することにより、失活した触媒の活性を初期値まで回復させることに成功した。
保科 宏行; 高橋 牧克*; 笠井 昇; 瀬古 典明
International Journal of Organic Chemistry, 2(3), p.173 - 177, 2012/09
A fibrous adsorbent for arsenic (As) removal was synthesized with nonwoven cotton fabric as a trunk polymer. Phosphoric acid monomer was reacted by radiation-induced graft polymerization onto nonwoven cotton fabric. The degree of grafting of 130% was obtained at irradiation dose of 20 kGy with 5% of monomer solution for 2 hours reaction time at 40C reaction temperature. After the grafted material was contacted with 10 mmol/L of zirconium (Zr) solution at pH1, 0.38 mmol/g of Zr as a functional group was loaded on the grafted phosphoric units for As(V) removal. The resulting adsorbent was evaluated by column mode adsorption with 1 mg/L of As(V) solution at various pH with space velocity 200 h
. The maximum capacity of As(V) adsorption was 0.1 mmol/g at pH2.
植木 悠二; Mohamed, N. H.*; 瀬古 典明; 玉田 正男
International Journal of Organic Chemistry, 1(2), p.20 - 25, 2011/06
An efficient fibrous catalyst for the biodiesel fuel production has been synthesized by radiation-induced graft polymerization of 4-chloromethylstyrene onto a nonwoven polyethylene (NWPE) fabric followed by amination with trimethylamine (TMA) and further treatment with NaOH. The degree of grafting of NWPE fabric and TMA group density of fibrous catalyst could easily and reproducibly be controlled within a range of up to 340% and 3.6 mmol-TMA/g-catalyst, respectively. In the transesterification of triglycerides and ethanol using the synthesized fibrous catalyst, the conversion ratio of triglycerides reached 95% after 4 h reaction at 50C.
