硝基酚类化合物在海水中的光化学氧化研究

酚类化合物尤其是硝基苯酚属于国家严格控制排放的有毒物质 .由于工业排污等原因 ,在近岸水体中能检测到许多酚类化合物 .我国胶州湾和杭州湾表层海水中酚的含量分别高达 3和 9mg/L1] .酚的毒性会影响海水生物的生长和繁殖 ,危及人类健康 .由于硝基苯酚难于生化降解 ,因此研究其在水体中的光降解十分重要 2～ 6 ] .文献中关于有机污染物的光化学研究大多侧重于废水处理 ,且降解方法也多采用 Ti O2 催化降解 7,8] .对于硝基苯酚在天然水体中的光降解则知之甚少 .本文通过模拟海水条件下硝基苯酚的光化学反应及其影响因素 ,更加深入地了…

Studies on Photochemical Oxidation of Nitrophenols in Seawater

The photochemical degradation of p nitrophenol and 2,4 dinitrophenol in both natural seawater and artificial seawater was studied under the irradiation of mixed light sources(ultraviolet lamp/high pressure mercury lamp). The photolysis of the two nitrophenols was influenced by various factors including medium, heavy metal ions and photosensitizer. The photolysis of the two nitrophenols in natural seawater was faster than in artificial seawater, presumably due to the effect of inherent photosensitizers in natural seawater. The addition of Cu 2+ , Pb 2+ or Cd 2+ into the seawater solutions obviously increased the photolysis rate of the nitrophenols. Interestingly, we found that the presence of anthroquinone could accelerate the photolysis of p nitrophenol in natural seawater but had almost no impact on the photolysis of 2,4 dinitrophenol. The half lives of the photoreactions in natural seawater under our conditions were 40-54 min for p nitrophenol and 37-69 min for 2,4 dinitrophenol, respectively. Our study suggests that photochemical degradation is an important removal pathway for the nitrophenols in seawater.