CS_2与亚硝酸水溶液复相体系的激光闪光光解  

Laser Flash Photolysis of CS_2-HNO_2 Aqueous Solution Complex System

作　　者：房豪杰[1] 欧阳彬[1] 朱承驻[1] 董文博[1] 张仁熙[1] 潘循皙[1] 侯惠奇[1] 

机构地区：[1]复旦大学环境科学研究所,上海200433

出　　处：《高等学校化学学报》2004年第10期1893-1896,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金 (批准号 :2 98770 0 5 )资助

摘　　要：利用激光光解 -瞬态吸收技术研究了氮气饱和条件下 CS2 与亚硝酸水溶液复相体系的 3 5 5 nm光解机理 .瞬态吸收光谱分析结果表明 :CS2 与 · OH自由基快反应生成 CS2 OH,产生的 CS2 OH继续与 HONO反应生成 CS2 OH-HONO加合物 ,其吸收峰分别为 2 85 ,3 0 5 ,475 ,490和 980 nm,反应 CS2 OH+HONOCS2 OH-HONO的二级速率常数为 ( 2 .79± 0 .0 5 )× 1 0 8L/( mol·s) ;2 3 0 nm处的吸收峰归属为 CS2 NO+ ,其一级衰减速率常数为 1 .2 8× 1 0 5s- 1 .The photolysis mechanism of N 2-saturated CS 2-HNO 2 aqueous solution was studied by means of the laser-photolysis/transient absorption technique at 355 nm. Spectra analysis shows that the oxidation of CS 2 in HNO 2 aqueous solution occurs via a complex reaction mechanism.One route is the rapid addiction of ·OH to CS 2 to form CS 2OH adduct, which successively reacts with HONO to form CS 2OH-HONO adduct.Five transient absorption peaks(285, 305, 475, 490 and 980 nm) are attributed to CS 2OH-HONO and the rate coefficient for CS 2OH+HONO reaction is (2.79±0.05)×10 8 L/(mol·s). The other reaction route is addiction of NO + to CS 2 to form CS 2NO + adduct which has an absorption peak of 230 nm. The first order decay rate coefficient for CS 2NO + is 1.28×10 5 s -1.

关 键 词：激光闪光光解 瞬态吸收光谱 二硫化碳 亚硝酸 复相体系 反应动力学 环境化学 

分 类 号：O613.71[理学—无机化学] X13[理学—化学]