在紫外光照射条件下,以双酚A(bisphenol A,BPA)为模型化合物,采用响应面法(response surface methodology,RSM)研究水环境中代表性可溶组分腐殖酸(humic acid,HA)、Fe3+、NO3-和Cl-对BPA光解的复合影响.结果表明,HA、Fe3+是影响BPA光降解的显著因素,其次是NO3-和Cl-.HA、NO3-和Cl-对BPA的光解起抑制作用,而Fe3+为促进作用(P<0.05).这些代表性可溶性组分共存于水体中时表现出交互作用.作为显著性因素,Fe3+分别与Cl-或HA复合时抑制BPA的光解,HA-C1-以及HA-NO3-共存时则表现为促进作用.作为非显著性因素,NO3-和Fe3+以及NO3-和Cl-之间显示出拮抗作用.自由基猝灭实验证明,作为最重要的影响因素,HA对BPA光解的影响主要是通过其激发三重态进行的.利用天然水样得到的模型预测值和实验值之间显示较好的一致性,表明该模型可用于估算BPA在所用天然水样中的光解,但也有一定的局限性.
Under UV irradiation conditions,bisphenol A(BPA)was used as a model compound to study the composite effects of representative soluble components humic acid(HA),Fe3+,and Cl-on the photolysis of BPA in the aqueous environment using response surface methodology(RSM).Results show that HA and Fe3+are the significant factors affecting the photodegradation of BPA,followed by NO3-and Cl-.HA,NO3-and Cl-significantly inhibits the photolysis of BPA,while Fe3+promotes it(P<0.05).When HA,Fe3+,NO3 and Cl-co-exists in the water environment,an interaction on the photolysis of BPA is established.As significant factors,the combination of Fe3+and Cl-or HA respectively inhibits the photodegradation of BPA,while the coexistence of HA-C1-or HA-NO3-shows promoting effect.As non-significant factors,there are antagonistic effects between NO3-and Fe3+or between NO3-and Cl-.Radical scavenging experiments unveils that the most important factor HA on BPA photodegradation is mainly attributed to triplet-excited DOM.The predicted value of the model obtained from the natural water sample is in good agreement with the experimental value,indicating that the model can be used to estimate the photolysis of BPA in the natural water sample used,but it also has certain limitations.