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Takeda, Toshihide*; Tamada, Masao; Seko, Noriaki; Ueki, Yuji
Radiation Physics and Chemistry, 79(4), p.223 - 226, 2010/04
Times Cited Count：12 Percentile：62.2(Chemistry, Physical)Ion exchange fabric (IEF) having the functional group of sulfonic acid was synthesized by radiation grafting of glycidyl methacrylate on a polyethylene nonwoven fabric and subsequent chemical modification. Total organic carbon eluted from the resulting IEF could be reduced to the concentration less than 1 ppb after washing with organic solvents. The obtained IEF was evaluated by 10 ppb Na
solution. The column packed IEF, 7 mm in diameter and 20 mm high, could remove the Na at the distribution coefficient of 1.2
10
at liner velocity of 400 m/h. Although the degree of column utilization by adsorbed Na is 3.9%, the breakthrough point reached 2.010
at column height of 95 mm. From these results, the IEF synthesized by graft polymerization can be applicable for water purification in ultra pure water production.
Saiki, Seiichi; Nagasawa, Naotsugu; Hiroki, Akihiro; Morishita, Norio; Tamada, Masao; Muroya, Yusa*; Kudo, Hisaaki*; Katsumura, Yosuke*
Radiation Physics and Chemistry, 79(3), p.276 - 278, 2010/03
Times Cited Count：12 Percentile：62.2(Chemistry, Physical)Carboxymethyl chitosan (CMCTS) is one kind of polysaccharide derivatives and has a good water-solubility. At a high concentrated aqueous solution, CMCTS forms gel by ionizing irradiation, though polysaccharide derivatives are generally radiation-degradation type. In general, OH radical, which is one of main water radiolysis products and very oxidative species, is said to induce crosslinking reaction of polymer solution. The purpose of this study is to understand the radiation-crosslinking mechanism of CMCTS at a high concentrated aqueous solution. In this study, identification of CMCTS radical produced by reaction with OH radical was introduced. CMCTS radical in an aqueous solution was observed directly by ESR method using photolysis of hydrogen peroxide. The ESR spectra have a large doublet split and small triplet split like [Triplet Doublet]. However, some species seemed to be overlapped on ESR spectra, because right-and-left triplet spectra are not equiform. Compared with some radicals, which have analogical structure to CMCTS, about hyperfine coupling constant, [Triplet Doublet], assigned as radical on carboxymethyl group linked to C6, and [Doublet], assigned as radical on carboxymethyl group linked to C2 or C3, were isolated from ESR spectra of experimental results. In conclusion, these spectra were identified as radicals located on secondary carbon of carboxymethyl groups.
