Hydroxyl radical, sulfate radical and nitrate radical reactivity towards   crown ethers in aqueous solutions

doi:10.1016/j.radphyschem.2012.01.025

CORC > 北京大学 > 化学与分子工程学院

	Hydroxyl radical, sulfate radical and nitrate radical reactivity towards crown ethers in aqueous solutions
	Wan, L. K. ; Peng, J. ; Lin, M. Z. ; Muroya, Y. ; Katsumura, Y. ; Fu, H. Y.
刊名	radiation physics and chemistry
	2012
关键词	Crown ether Cation Nitrate radical Sulfate radical Pulse radiolysis Laser photolysis RATE CONSTANTS PULSE-RADIOLYSIS RADIATION-CHEMISTRY WASTE STREAMS DICYCLOHEXANO-18-CROWN-6 EXTRACTANT STRONTIUM PRODUCTS DCH18C6 PHASE
DOI	10.1016/j.radphyschem.2012.01.025
英文摘要	Reaction rate constants of crown ethers (12-crown-4, 15-crown-5, 18-crown-6) and their analogs 1,4-dioxane (6C2) with some important oxidative radicals, hydroxyl radical ((OH)-O-center dot), sulfate radical (SO4 center dot-) and nitrate radical (NO3 center dot), were determined in various aqueous solutions by pulse radiolysis and laser photolysis techniques. The reaction rate constants for 6C2 and crown ethers with (OH)-O-center dot and SO4 center dot- increase with the number of hydrogen atoms in the ethers, indicating that the hydrogen-atom abstraction is a dominant reaction between crown ethers and these two radicals. The presence of cations in solution has negligible effect on the rate constants of crown ether towards (OH)-O-center dot and SO4 center dot- However, for the NO3 center dot, the rate constants are not proportional to the number of hydrogen atoms in ethers, and 12-crown-4 (12C4) is the most reactive compared with other crown ethers. Except 12C4 and 6C2, the cations in the aqueous solution affect the reactivities of 15-crown-5 (15C5) and 18-crown-6 (18C6). The cations with high binding stability for crown ether would improve the reactivity of 15C5. For the studied crown ethers, the reaction rate constants of these oxidative radicals have the order (OH)-O-center dot > SO4 center dot- > NO3 center dot. Furthermore, the formation of radicals after the reaction of crown ethers with sulfate radical could be observed in the range of 260-280 nm using laser photolysis and pulse radiolysis. This is the first report on the kinetic behavior of crown ethers with NO3 center dot, and it would be helpful for the understanding of stability of crown ethers in the processing of spent nuclear fuel. (C) 2012 Elsevier Ltd. All rights reserved.; Chemistry, Physical; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; SCI(E); EI; 0; ARTICLE; 5; 524-530; 81
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/235451]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Wan, L. K.,Peng, J.,Lin, M. Z.,et al. Hydroxyl radical, sulfate radical and nitrate radical reactivity towards crown ethers in aqueous solutions[J]. radiation physics and chemistry,2012.
APA	Wan, L. K.,Peng, J.,Lin, M. Z.,Muroya, Y.,Katsumura, Y.,&Fu, H. Y..(2012).Hydroxyl radical, sulfate radical and nitrate radical reactivity towards crown ethers in aqueous solutions.radiation physics and chemistry.
MLA	Wan, L. K.,et al."Hydroxyl radical, sulfate radical and nitrate radical reactivity towards crown ethers in aqueous solutions".radiation physics and chemistry (2012).