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化学学报
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化学学报 ›› 2001, Vol. 59 ›› Issue (2): 151-157.    下一篇

研究论文

4-氯酚稀水溶液的脉冲辐解研究

王淑惠;于勇;候健;候惠奇;姚思德   

  1. 复旦大学环境科学研究所;中国科学院上海原子核所辐射化学开放实验室
  • 发布日期:2001-02-15

Pulse radiolysis studies on aqueous 4-chlorophenol in dilute solutions

Wang Shuhui;Yu Yong;Hou Jian;Hou Huiqi;Yao Side   

  • Published:2001-02-15

PDF

476

被引次数

67 | 13

利用脉冲电子束进行了多种条件下4－氯酚稀水溶液的脉冲辐解研究，对其瞬态光谱中的主要吸收峰作了归属，并初步考察了这些瞬态物种的生长、衰减等行为，研究表明，·OH基与4－氯酚在碱性条件下反应生成氯代酚氧基，速率常数为4.14×10^9L/(mol·s)，在酸性条件下要经过OH-adducts；H原子与4-氯酚反应生成H-adducts的速率常为2.0×10^9L/(mol·s)，产物可通过双分子二级反应逐步脱氯；eaq^-可直接从4-氯酚分子夺氯，反应速率常数为1.82×10^9/L(mol·s)。

关键词: 氯酚, 脉冲辐照, 辐射分解, 瞬态性能, 吸收光谱法, 稀溶液, 自由基

Pulse radiolysis of aqueous 4-chlorophenol in dilute solutions under different conditions was studied. The main characteristic peaks in these transient absorption spectra were attributed and the bulid-up/ decay trends of several transient species were investigated. Under alkaline conditions, the reaction of Oh radical and 4-chlorophenol produces chlorinated phenoxyl radical with a rate constant of 4.14× 10^9L/mol·s);while under acid conditions, the initial product is mainly OH-adduct. The reaction of H with 4-chlorophenol produces H- adduct with a rate constant about 2.0×10^9L/(mol·s) and the intemediate can remove Cl from itself gradualy through a second-order reaction. In alkaline solutions, eaq^- can capture Cl directly from 4- chlorophenol with a rate constant about 1.82×10^9L/(mol·s).

Key words: PULSED IRRADIATION, RADIOLYSIS, TRANSIENT PERFORMANCE, ABSORPTION SPECTROMETRY, DILUTE SOLUTION, FREE RADICALS

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