以Fe₃O₄和α-FeOOH为核、SiO₂为壳,采用沉淀法制备α-FeOOH-Fe₃O₄@SiO₂磁性复合材料,通过溶胶-凝胶法制备了TiO₂-Fe₂O₃,然后通过厌氧煅烧法制备了α-FeOOH-Fe₃O₄@SiO₂@TiO₂-Fe₂O₃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-Fe₃O₄@SiO₂@TiO₂-Fe₂O₃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-Fe₃O₄@SiO₂ magnetic composites are synthesized via a precipitation method through using Fe₃O₄ and α-FeOOH as the core,and SiO₂ as the shell.Additionally,TiO₂-Fe₂O₃ is synthesized through a sol-gel method,then α-FeOOH-Fe₃O₄@SiO₂@TiO₂-Fe₂O₃ 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 over α-FeOOH-Fe₃O₄@SiO₂@TiO₂-Fe₂O₃.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 of α-FeOOH-Fe₃O₄@SiO₂@TiO₂-Fe₂O₃,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.

白圆(1982-),女,工学博士,副教授,研究方向为水处理技术与理论,通讯联系人,1834402619@qq.com。