磷酸修饰对纳米Fe_2O_3热稳定性及光催化性能的影响  

Effects of Phosphate Modification on the Thermal Stability and Photocatalytic Activity of Nanosized Fe_2O_3

作　　者：孟庆强[1] 孙婉婷[1] 栾云博[1] 井立强[1] 

机构地区：[1]黑龙江大学化学化工与材料学院,功能无机材料化学教育部重点实验室,哈尔滨150080

出　　处：《高等学校化学学报》2014年第8期1782-1787,共6页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21071048);教育部创新团队(批准号:IRT-1237);教育部科学技术项目(批准号:213011A)资助~~

摘　　要：通过溶液浸渍蒸干过程实现了磷酸对Fe2O3纳米粒子的表面修饰,研究了磷酸修饰对纳米Fe2O3的热稳定性及光催化活性的影响.结果表明,磷酸修饰显著提高了Fe2O3的热稳定性,主要归因于磷酸修饰在样品表面抑制了粒子之间的团聚生长.同时,在光催化降解气相乙醛和液相苯酚的测试中,磷酸修饰后热处理温度为600℃的样品表现出了最佳的可见光催化性能,这主要归因于该样品具有高晶化度、小粒子尺寸及大比表面积,并且适量的修饰有利于其光催化性能的提高.α-Fe2 O3 nanoparticles were modified with phosphate acid by the dipping-steam solution process. The influence of phosphate modification on the thermal stability of nanosized Fe2 O3 was investigated. The re-sults showed that the thermal stability of Fe2 O3 was remarkably enhanced by phosphate modification, owing to the inhibition of aggregation between nanoparticles by the modified phosphate groups. The sample treated at 600 ℃ showed the highest photocatalytic activity for degrading gas-phase acetaldehyde and liquid-phase phe-nol. This was ascribed to the high crystallinity, small nanoparticle size and large specific surface area of the sample. Moreover, it was favorable to improve the photogenerated charge separation after modification with a proper amount of phosphoric acid.

关 键 词：三氧化二铁 热稳定性 光生电荷分离 光催化 无色污染物降解 

分 类 号：O643.3[理学—物理化学]