α-FeOOH-Fe_(3)O_(4)@SiO_(2)@TiO_(2)-Fe_(2)O_(3)光催化材料的制备及对苯酚的降解性能研究  

Preparation ofα-FeOOH-Fe_(3)O_(4)@SiO_(2)@TiO_(2)-Fe_(2)O_(3)photocatalysis material and study on its properties in catalytic degradation of phenol

作　　者：白圆[1] 沈莘桐 Chanthavong Manininh 马睿 BAI Yuan;SHEN Xin-tong;CHANTHAVONG Manininh;MA Rui(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070

出　　处：《现代化工》2024年第S02期103-109,共7页Modern Chemical Industry

基　　金：甘肃省科学技术厅重点研究开发项目(21YF5GA051);甘肃省高校产业支持计划项目(2020c-38)。

摘　　要：以Fe_(3)O_(4)和α-FeOOH为核、SiO_(2)为壳,采用沉淀法制备α-FeOOH-Fe_(3)O_(4)@SiO_(2)磁性复合材料,通过溶胶-凝胶法制备了TiO_(2)-Fe_(2)O_(3),然后通过厌氧煅烧法制备了α-FeOOH-Fe_(3)O_(4)@SiO_(2)@TiO_(2)-Fe_(2)O_(3)材料并用来降解苯酚溶液。利用XRD、XPS、SEM、TEM、VSM等表征分析了材料的组成、结构、形貌及磁性能。通过单因素分析确定α-FeOOH-Fe_(3)O_(4)@SiO_(2)@TiO_(2)-Fe_(2)O_(3)光催化反应300 min降解苯酚的最佳条件。结果表明,在pH=2时降解率为82.3%,材料投加量为0.5 g时降解率为62.3%,光照强度为9 W时降解率为91.2%。自由基清除剂实验表明,超氧自由基和羟基自由基在降解苯酚过程中起主要作用。纳米磁性材料有效改善了光生电子/空穴分离效率,而且在维持催化活性的同时赋予了材料磁性,实现了材料的高效回收。α-FeOOH-Fe_(3)O_(4)@SiO_(2)magnetic composites are synthesized via a precipitation method through using Fe_(3)O_(4)andα-FeOOH as the core,and SiO_(2)as the shell.Additionally,TiO_(2)-Fe_(2)O_(3)is synthesized through a sol-gel method,thenα-FeOOH-Fe_(3)O_(4)@SiO_(2)@TiO_(2)-Fe_(2)O_(3)is prepared through anaerobic calcination method,and used for the degradation of phenol.XRD,XPS,SEM,TEM,VSM,and other characterization techniques are employed to comprehensively analyze the composition,structure,morphology,and magnetic properties of the synthesized materials.The optimal conditions for phenol degradation are identified through single-factor analysis during the 300-minute photocatalytic reaction overα-FeOOH-Fe_(3)O_(4)@SiO_(2)@TiO_(2)-Fe_(2)O_(3).It is indicated by the results that the degradation rate of phenol reaches 82.3%at a pH of 2,62.3%with a 0.5 g dosage ofα-FeOOH-Fe_(3)O_(4)@SiO_(2)@TiO_(2)-Fe_(2)O_(3),and 91.2%under a 9 W light intensity.Free radical scavenger experiment reveals that both superoxide and hydroxyl radicals are pivotal in the degradation of phenol.Nano magnetic materials significantly enhance the separation efficiency of photogenerated electron-hole,maintain catalytic activity,confer magnetic properties,and facilitate efficient materials recovery.

关 键 词：苯酚 光催化 纳米磁性材料 降解 

分 类 号：TQ321[化学工程—合成树脂塑料工业]