纳米Fe_2O_3光催化降解邻苯二甲酸二正辛酯的研究

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、p H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100 mg/L、DOP初始质量浓度为20 mg/L及p H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.

Photocatalytic Degradation of Dioctyl Phthalate with Fe2O3 Nanoparticles

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.