模拟太阳光-过氧化氢作用下冰相中苯酚的光转化

摘要

Using simulated solar light, under the condition of low temperature(-14—-12 ℃), the photo-conversion reaction of phenol was studied when H2 O2 existed in the water ice. The influence factors and the dynamics of the photoconversion of phenol in the water ice were investigated. With the increasing of the H2 O2 initial concentration and light intensity, the photoconversion rate of phenol was increased rapidly. While the photoconversion rate decreased with the increasing of the phenol initial concentration. The photoconversion of phenol was decreased from acid conditions to alkali conditions. The photoconversion course follows the first-order kinetics equation. The photoproducts detected by GC-MS( gas chromatography-mass spectrometer) indi-cate that the hydroxylation reactions occurred in the photoconversion course.%以模拟太阳光为照射光源，对冰相中苯酚在过氧化氢( H2 O2)存在条件下的光转化反应进行了研究，考察了影响苯酚光转化反应的主要因素并探讨了光转化动力学过程。研究结果表明，光强度越高或H2 O2初始浓度越大，苯酚在冰相介质中的光转化率越快，而苯酚初始浓度越高则会导致苯酚的光转化率减慢。 pH值对苯酚的光转化率的影响则表现为酸性导致减小，碱性导致加快。应用气相色谱-质谱联用仪( GC-MS)分析了苯酚的光解产物，推断苯酚在冰相中的光解过程中主要发生了羟基化反应。