纳米Fe2O3光催化降解邻苯二甲酸二正辛酯的研究

摘要 采用水热合成法，制备了具有中空状的氧化铁(Fe2O3)粒子，然后以卤素灯为光源，以邻苯二甲酸二正辛酯(DOP)水溶液为研究对象，详细探讨了Fe2O3的浓度、DOP的初始浓度、pH值及H2O2浓度等因素对DOP光催化降解效率的影响，并采用GC-MS联用技术对DOP的光催化降解机理进行了研究.结果表明，在不需添加H2O2时，当Fe2O3粒子添加量为100mg/L、DOP初始质量浓度为20mg/L及pH值为7时，DOP光催化降解速率最大； 降解过程中首先从苯环支链开始降解，之后发生苯环开环，最终矿化为CO2和H2O.
Abstract：Hollow Fe2O3 particles were prepared by hydrothermal synthesis. The effects of Fe2O3 concentration， initial concentration of dioctyl phthalate (DOP)， pH value and H2O2 concentration on the photocatalytic degradation of DOP aqueous solution were experimentally studied using halogen lamp as light source. The photocatalytic degradation mechanism of DOP with Fe2O3 particles was studied with GC-MS technology. The results showed that without H2O2 addition， the photocatalytic degradation rate of DOP is the greatest when the Fe2O3 concentration， DOP initial concentration， and pH value were 100mg/L， 20mg/L and 7， respectively. During the degradation process， the branched chain of benzene ring degrades first， then the benzene ring is opened， and the ultimate products are CO2 and H2O.