摘要
利用瞬态吸收光谱技术研究水体污染物CCl4 和CHCl3 在紫外光照条件下的转化和归宿 ,表明在 2 4 8nm激光作用下 ,CCl4 解离为CCl3 和Cl自由基 ;CHCl3 在此条件下不解离 ,但加入少量的苯后即发生明显解离 ,产生CHCl2 和Cl自由基 .在有氧条件下 ,光解产生的CCl3 和CHCl2 自由基均与O2 反应分别生成CCl3O2 和CHCl2 O2 ;在无氧条件下 ,CCl3 和CHCl2 则发生偶合反应分别生成C2 Cl6和C2 H2 Cl4 .本研究还得出了一些微观速率常数 .
The photolysis mechanism of CCl 4 and CHCl 3 in water was studied by using transient absorption spectra. The results showed that aqueous CCl 4 was dissociated into CCl 3 and Cl radicals by 248 nm laser ,and CHCl 3 was dissociated into CHCl 2 and Cl radicals after adding C 6H 6. The radicals CCl 3 and CHCl 2 were able to react with O 2 to form CCl 3O 2 and CHCl 2O 2 respectively, or to form C 2Cl 6 and C 2H 2Cl 4 without O 2. The rate coefficients of some reactions were obtained.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2001年第3期6-10,共5页
Environmental Science
基金
国家自然科学基金!资助项目 (2 97770 0 3)
