水溶液とゼオライトとの混合物中での線照射による2-chlorophenolの分解

Degradation of 2-chlorophenol by -ray irradiation in zeolite/water mixtures

熊谷 友多   

Kumagai, Yuta

分離核変換サイクルにおける発熱性核種の線源利用への展開を目指して、線を用いた水処理法の吸着剤併用による高度化を目的として、水溶性有機物の放射線分解に対するゼオライトの添加効果を調べた。模擬物質として2-クロロフェノール(2-ClPh)の水溶液を用いて、線照射による分解反応に対する各種ゼオライトの添加効果、溶液pHの影響、2-ClPh濃度の影響を調べた。その結果、モルデナイト型ゼオライト(NaMOR)の添加により2-ClPhがNaMORに吸着し、照射により吸着した2-ClPhが分解することを明らかにした。さらに、2-ClPhが分子状で溶存するpH条件が吸着に適しており分解効率が向上すること、2-ClPh濃度の増加とともに吸着量が増加し、分解が促進されることを明らかにした。

Radiation-induced degradation of 2-chlorophenol (2-ClPh) in zeolite/water mixtures was studied in order to consider a possibility of adsorption on zeolites to improve efficiencies of irradiation treatments of water contaminated by organic compounds. The degradation of 2-ClPh by -ray irradiation was investigated as a model compound. The degradation was evaluated by chloride ion (Cl) production. A high concentration of Cl was observed after the irradiation of a mixture with a mordenite-type zeolite (NaMOR), whereas A-type and X-type zeolites showed no significant effect. Therefore, for the mixture with NaMOR, effects of pH of the solution and of the 2-ClPh concentration were examined. At pH 5.7, the excess production of Cl was induced by the addition of NaMOR. Concurrently, adsorption of 2-ClPh on NaMOR was observed. When the mixture contained a higher concentration of 2-ClPh at pH 5.7, the Cl production increased. The adsorption of 2-ClPh also increased with increasing concentration. The results suggest that organics adsorbed on zeolites are decomposed by irradiation effectively at high adsorption concentrations.