作　　者： ; ; ; ;

机构地区： 东莞理工学院城市学院城市与环境科学系

出　　处： 《安全与环境学报》 2007年第6期5-9,共5页

摘　　要： 为了更好地了解苯胺类物质在环境中的化学行为,在自行设计的光化学反应器上进行模拟天然水体的苯胺光降解实验,用气相色谱法测定苯胺的残余质量浓度,考察了水体pH值、光强、反应时间、光敏化剂、水质等条件影响下苯胺的光降解效果和规律。3h内苯胺在3个不同体系中的降解效果从大到小依次是:去离子水模拟天然水体、加入光敏化物质的灭菌河水、未加光敏化物质的灭菌河水。pH值为5.0,Fe^(2+)过氧化氢、腐殖质存在时苯胺的光降解效果较好。 This paper is inclined to present the results of our natural water degradation simulated experiments so as to gain a better understanding over the behavior of the photooxidation degradation of aniline in a photochemical reactor designed by ourselves. It is known that natural water contains various kinds of ions, including organic and inorganic substances with active oxygen. Since the redoxite reaction may take place in the natural water when it is in the active condition at the presence of Fe^2＋ , Fe^3＋ and H2O2, the UV/Fenton reaction can be conducted under the sunlight as a result of the illumination, which is vital to the organic pollutant spreading. And since the pbotooxidation degradation of aniline reacts to the laboratory-simulated natural water in a photochemical reactor, the remaining concentration of the aniline can be determined through the gas phase chromatography, which makes it possible to determine the degradation effect and the rule concerned in the following five ways, that is, through the pH value; the light intensity, the time, the photoactivate matter and the water source. Thus, the experiment results of ours have shown that the pH value in this case proves higher, which is not favorable for the degradation. Comparing the degradation effect between the high-pressurized antiseptic river water and the ion-free water, the degradation effect in the former turns to be worse. However, since the degradation tends to reduce the reaction speed, and even impede the reaction due to some other ions, the reaction is likely to capture the HO-free radicals in the river water. In this case, the aniline is expected to get oxidated by the hydrogen peroxide at ,the presence of ferrous ions in the water by the colloid form, which by nature absorbs the organic pollutant in it. In addition, since HA absorbs the ray radiation and leads to complex changes in the polluted substances, it is favorable for the aniline degradation. The other three ways available also help to form the Fenton system and also promote the

关 键 词： 环境化学 天然水体 苯胺 光氧化降解

领　　域： [环境科学与工程]