不同形态氮对水中4,4′-二溴联苯光解的影响

PHOTOLYTIC REACTION OF 4,4′-DIBROMBIPHENYL IN WATER WITH DIFFERENT FORM OF N

模拟研究环境中不同形态氮转化对水中4,4′-二溴联苯光解的影响.结果表明,4,4′-二溴联苯的光解反应符合一级动力学规律.NO-3、NO-2的存在均对4,4′-二溴联苯的光解有抑制作用,抑制作用的发生是NO-3、NO2-与4,4′-二溴联苯对光辐射的竞争性吸收作用引起的,NO-2对4,4′-二溴联苯的抑制作用强于NO-3.在低pE值时,随着pE值升高,NH+4向NO2-转化,对4,4′-二溴联苯光解的抑制作用增强;而在高pE值时,NO2-向NO-3转化,随着pE值升高,对4,4′-二溴联苯光解的抑制作用减弱.

The effect of nitrogen transformation on the photolysis of 4,4′-dibrombiphenyl in water was studied in this paper.The results showed that the photolysis of 4,4′-dibrombiphenyl followed first-order kinetics.Because of the competitive adsorption for light,both NO-3 and NO-2 inhibited the photolysis of 4,4′-dibrombiphenyl and NO-2 had stronger inhibition.In low pE value solutions,the inhibition increased along with the increasing pE value for the transformation from NH＋4 to NO-2;while in high pE value solutions,with the transformation from NO-2 to NO-3,the effect was reduced.