纳米α-Fe2O3/TiO2光催化剂的制备及其光催化性能研究  

Preparation of nano-α-Fe2O3/TiO2 and its photocatalytic performance

作　　者：徐家通 陈小泉[1] 朱红玲[1] 张玲 Xu Jiatong;Chen Xiaoquan;Zhu Hongling;Zhang Ling(State Key Lab of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640)

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室,广州510640

出　　处：《化工新型材料》2020年第3期197-202,共6页New Chemical Materials

基　　金：广东省科技计划专项项目(2015A020215012);广州市科技计划项目(201607010050);制浆造纸工程国家重点实验室研究基金项目(2015C05)。

摘　　要：以硝酸铁为铁源,NaOH为沉淀剂合成单分散性良好的纳米α-Fe2O3粒子,然后与纳米TiO2胶体复合制备了纳米α-Fe2O3/TiO2光催化剂。利用动态光散射粒径分析仪、扫描电子显微镜、紫外-可见分光光度计、X射线衍射仪对光催化剂的物相、形貌进行了表征。在室温条件下,以甲醛作为有机污染物,在可见光照射下探讨了纳米α-Fe2O3粒径、α-Fe2O3摩尔分数等对甲醛光催化降解的影响。结果表明,在一定范围内,随着粒径的减小,纳米α-Fe2O3光催化活性增强,在120min内粒径40nm的纳米α-Fe2O3对甲醛的降解效果最好,降解率约为93.05%。与纯TiO2相比,纳米α-Fe2O3/TiO2光催化剂的可见光催化活性明显增强,纳米α-Fe2O3最佳含量为0.20%(摩尔分数)。纳米α-Fe2O3含量过大,纳米α-Fe2O3/TiO2光催化剂的催化活性将降低。Fe(NO3)3 and NaOH were used as iron source and precipitant to synthesize monodisperse nano-α-Fe2O3 particles.The synthetic product was used to prepare theα-Fe2O3/TiO2 nanocomposite photocatalyst.The phase and morphology of the nanocomposite were characterized by dynamic light scattering particle size analyzer,scanning electron microscope,ultraviolet visible light spectrum and X ray diffraction.At room temperature,using formaldehyde as organic pollutants,the effects of the size and mole fraction of nano-α-Fe2O3 on the photocatalytic degradation were studied under the illumination of visible light.The experimental results showed that the photocatalytic activity increased with the decrease of nano-α-Fe2O3 particle size within limits.In 120 min,the formaldehyde degradation rate was the highest,about 93.05%,while the nanocomposite contained 40 nm α-Fe2O3 was used.Compared with pure TiO2 photocatalyst,the photocatalytic activity of TiO2 nanoparticles recombined by nano-α-Fe2O3 was obviously enhanced,and under the photocatalysis of 120 min,the optimizing molar percentage concentration of nano-α-Fe2O3 was 0.2%.The photocatalytic activity of visible light was reduced when the composite concentration is too large.

关 键 词：TIO2 纳米Α-FE2O3 可见光光催化 甲醛降解 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] X701[环境科学与工程—环境工程]