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Mikami, Takashi*; Nakano, Masanori*; Shibata, Takuya; Seko, Noriaki
Setsubi To Kanri, 47(4), p.95 - 99, 2013/04
no abstracts in English
Tamada, Masao; Ueki, Yuji; Seko, Noriaki; Takeda, Toshihide*; Kawano, Shinichi*
Radiation Physics and Chemistry, 81(8), p.971 - 974, 2012/08
Times Cited Count：7 Percentile：48.31(Chemistry, Physical)In the fabrication process of semiconductor, Si wafer surface is etched by strong-alkaline aqua solutions such as 48 % NaOH and KOH. If the etchant is contaminated by Ni and Cu, smalls pits which appeared on Si surface in the process of surface polishing caused poor production yield of the Si wafers. Available commodity adsorbent resins shrink in the high concentration of alkaline aqua solutions and bias flow occurred in the case of their column packing. Hence, novel fibrous adsorbent was synthesized by radiation-induce graft polymerization on nonwoven materials composed of pure polyethylene fibers. The obtained fibrous adsorbent module (TM: Metolate) had practical cost and performance that flow rate is ten times and effective capacity is some tens times higher than commercialized adsorbent resins and fibers.
Takeda, Toshihide*; Tamada, Masao; Seko, Noriaki; Ueki, Yuji
Radiation Physics and Chemistry, 79(4), p.223 - 226, 2010/04
Times Cited Count：12 Percentile：62.3(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.
Takeda, Toshihide*; Tamada, Masao
JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 48, 2007/02
The fabric graft-adsorbent can adsorb the metal ions quicker than a commercial resin adsorbent. Additionally, its application to the production of ultra-pure water used in the process of the semiconductor and the liquid crystal is expected to reduce the elution of the total organic carbon. In the present research, the removal characteristic of the sodium ion in extremely low concentration was investigated by using the graft adsorbent of sulfonic acid type which was synthesized by the radiation-induced graft polymerization. The break point of the column evaluation was 660 in the sodium ion concentration of 10,000 ppb. The break point increased as the concentration of sodium ion decreased and became 5,000 at 10 ppm. The graft adsorbent of sulfonic acid type was considered to be promising adsorbent for the graft adsorbent of sulfonic acid type on the point of view of adsorption capacity of sodium ion.
Takeda, Toshihide*; Tamada, Masao
no journal, ,
The fabric graft-adsorbent can adsorb the metal ions quicker than a commercial resin adsorbent. Additionally, its application to the production of ultra-pure water used in the process of the semiconductor and the liquid crystal is expected to reduce the elution of the total organic carbon. In the present research, the removal characteristic of the sodium ion in extremely low concentration was investigated by using the graft adsorbent of sulfonic acid type which was synthesized by the radiation-induced graft polymerization. The break point of the column evaluation was 660 in the sodium ion concentration of 10,000 ppb. The break point increased as the concentration of sodium ion decreased and became 5,000 at 10ppm. The graft adsorbent of sulfonic acid type was considered to be promising adsorbent for the graft adsorbent of sulfonic acid type on the point of view of adsorption capacity of sodium ion.
Tamada, Masao; Takeda, Toshihide*
no journal, ,
Glycidyl methacrylate (GMA) was grafted onto 
-irradiated polyethylene nonwoven fabric which has low leaching of total organic carbon (TOC). The functional group of sulfonic acid was imparted by chemical treatment of grafted fabric. The resulting metal adsorbent removed sodium ion from 10 ppb solution with 400 m/L in linear velocity. This rate is 2000 times faster than that of commercialized adsorbent resins. The breakthrough point was 40,000 in bed volume and the eluted TOC was less than 0.03 ppb. The grafting was carried out by emulsion system to reduce the production cost. As a result, the cost could be reduced into the practical level since suitable dose for grafting was reduced to 50 kGy.
Nakano, Masanori*; Muraki, Shinsaku*; Nishino, Toru*; Chikaishi, Naoki*; Mikami, Takashi*; Shibata, Takuya; Hoshina, Hiroyuki; Saiki, Seiichi; Ueki, Yuji; Kasai, Noboru; et al.
no journal, ,
no abstracts in English
Kasai, Noboru
no journal, ,
no abstracts in English
