化工新型材料

化工新型材料 ›› 2020, Vol. 48 ›› Issue (3) : 197-202.

科学研究

纳米α-Fe₂O₃/TiO₂光催化剂的制备及其光催化性能研究

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

Xu Jiatong, Chen Xiaoquan, Zhu Hongling, Zhang Ling

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Received		Published
2018-10-24		2020-03-20
Issue Date	Revised Date
2020-04-02	2018-10-24

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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。

Abstract

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 the α-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 120min,the formaldehyde degradation rate was the highest,about 93.05%,while the nanocomposite contained 40nm 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

Key words

TiO₂ / nano-α-Fe₂O₃ / visible light photocatalysis / formaldehyde degradation

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纳米α-Fe₂O₃/TiO₂光催化剂的制备及其光催化性能研究[J]. 化工新型材料, 2020, 48(3): 197-202 DOI:

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