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以氙灯为光源模拟太阳光,通过研究不同pH条件下3种酚类污染物直接光解的过程,探讨了酚类污染物的解离对其光解规律的影响,并建立了解离态与非解离态酚类污染物光解速率常数的计算方法及预测模式.结果表明,随着pH从4.0增加到9.0,五氯酚的光解速率常数随之从25.30×10-4min-1增加到82.90×10-4min-1,而对硝基酚的光解速率常数相应从11.90×10-4min-1降低到了3.18×10-4min-1.苯酚的光解趋势与对硝基酚相似,当pH从4.0增加到11.0时,其光解速率常数依次从32.50×10-4min-1降低至13.40×10-4min-1.3种酚类化合物的光解总速率常数与解离度之间均满足幂函数变化规律.任意解离度条件下的解离态和非解离态光解速率常数,可根据幂函数的切线方程来确定.解离对酚类物质降解规律的影响主要是通过氧负离子的形成,改变苯环以及其他取代基团的活性而造成的.该研究结果为进一步了解天然水环境中酚类污染物的环境行为提供了理论参考.
Using xenon lamp as light source to simulate sunlight, the photolysis of three phenolic pollutants under different pH conditions was studied. The photolysis of phenolics pollutants was discussed. Photolysis rate constants of dissociated phenolic pollutants and prediction model.The results show that as the pH increases from 4.0 to 9.0, the photolysis rate constant of pentachlorophenol increases from 25.30 × 10-4min-1 to 82.90 × 10-4min-1, and the photolysis rate constants of p-nitrophenol decreased from 11.90 × 10-4min-1 to 3.18 × 10-4min-1, respectively.The photolysis tendency of phenol was similar to that of p-nitrophenol when When the pH was increased from 4.0 to 11.0, the photolysis rate constant decreased from 32.50 × 10-4min-1 to 13.40 × 10-4min-1. The total photolysis rate constant and the dissociation degree of 1.3 phenolic compounds all satisfy the power Function law of dissociation. The dissociation rate and dissociation rate constants can be determined according to the power function tangent equation. The effect of dissociation on the degradation of phenols mainly through the oxygen anion Formed, changing the activity of benzene rings and other substituent groups caused by the results of this study to further understand the natural Phenolic environmental pollutants in environmental behavior provides a theoretical reference.