【摘要】 利用瞬态吸收光谱技术进行了有氧、无氧条件下苯与亚硝酸水溶液复相体系的交叉反应机理研究 ,初步考察了这些瞬态物种的生长与衰减等行为 ;并对其光解产物进行了GC/MS分析 .研究表明 ,HNO2 在 3 5 5nm紫外光的照射下可产生·OH和NO+ ,·OH自由基和苯反应生成C6H6 OHadduct ,反应速率常数为 8 9× 10 9L·mol-1·s-1,在有氧条件下C6H6 OHadduct进一步氧化为C6H6 OHO2 ,反应速率常数 3 3× 10 8L·mol-1·s-1;NO+ 自由基和苯作用形成C6H6 NO+ πcomplex ,然后进一步分解更多还原

【Abstract】 The cross-reaction microscopic mechanism of aqueous benzene with nitrous acid in the presence of O 2 or absence of O 2 in dilute solutions was studied by laser flash photolysis. The main characteristic peaks in these transient absorption spectra were attributed and the build-up/decay trends of several transient species were investigated. ·OH radical and nitrosonium cation (NO +) can be produced in aqueous solution of nitrous acid exposed to 355 nm laser beam. NO + reacts with benzene to produce C 6H 6-NO +π complex. The rate constant of the reaction between ·OH radical and benzene was measured to be 8 9×10 9 L·mol -1·s -1. The transient product C 6H 6-OH adduct reacts with O 2 to form C 6H 6-OHO 2 with the rate constant of 3 3×10 8 L·mol -1·s -1. The final photolysis products were analyzed by using GC/MS method and the possible reaction pathways were also discussed.更多还原