Preparation of β-FeOOH/TiO2 composite film and its photocatalytic performance
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摘要: 为提高TiO2在可见光下的光催化性能，通过二次水热反应在FTO导电玻璃上制备获得了高度有序的β-FeOOH/TiO2复合薄膜材料。利用扫描电子显微镜(SEM)、X射线衍射(XRD)、拉曼(Raman)及红外光谱(FTIR)对其表面形貌、晶体结构及物相组成进行了分析。采用紫外可见漫反射光谱(UV-Vis DRS)对其光吸收性能进行了测试。最后以甲基橙(MO)为模拟污染物，考察了复合薄膜材料在可见光下的光催化活性。结果表明：TiO2与β-FeOOH之间通过Fe—O—Ti键连接，成功制备出的β-FeOOH/TiO2复合薄膜材料具有较好的结构稳定性。β-FeOOH/TiO2复合薄膜材料由于其构造的异质结和合适的能带结构，有效的提高光生载流子的迁移效率，并使其光响应范围成功扩展到540 nm左右。β-FeOOH/TiO2复合薄膜材料在可见光下展现出了优异的光催化性能，其光催化效率比未改性的TiO2样品提高60.6%，经过六次光催化降解循环试验，复合薄膜仍保持良好的连续性，且光催化降解MO的性能仍保持在94%左右。Abstract: In order to improve the photocatalytic performance of TiO2 under visible light, a highly ordered β-FeOOH/TiO2 composite film material was prepared on FTO conductive glass through a secondary hydrothermal reaction, using scanning electron microscopy (SEM) and X-ray diffraction (XRD), Raman (Raman) and infrared spectroscopy (FTIR) analyzed its surface morphology, crystal structure and phase composition. UV-Vis Diffuse Reflectance Spectroscopy (UV-Vis DRS) was used to test its light absorption performance. Finally, using methyl orange (MO) as a simulated pollutant, the photocatalytic activity of the composite film material under visible light was investigated. The results show that: TiO2 and β-FeOOH are connected by Fe—O—Ti bond, and the β-FeOOH/TiO2 composite film material successfully prepared has good structural stability. The β-FeOOH/TiO2 composite film material, due to its structural heterojunction and suitable energy band structure, effectively improves the migration efficiency of photogenerated carriers, and successfully expands its photoresponse range to about 540 nm. The composite film material exhibits excellent photocatalytic performance under visible light. The photocatalytic efficiency of β-FeOOH/TiO2 is 60.6% higher than that of the unmodified TiO2 sample. After six photocatalytic degradation cycles, the composite film is still in good condition. The continuity of the photocatalytic degradation of MO is still maintained at about 94%.
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Key words:
- TiO2 /
- β-FeOOH /
- composite film /
- hydrothermal method /
- photocatalytic degradation /
- methyl orange
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图 1 β-FeOOH/TiO2复合薄膜的制备流程图
Figure 1. Flow chart of preparation of β-FeOOH/TiO2 composite film
TNR—TiO2 nanorods; TBOT—Tetrabutyl titanate
图 2 FTO基底、TNR及β-FeOOH/TiO2复合薄膜材料的XRD图谱
Figure 2. XRD patterns of FTO, TiO2 and β-FeOOH/TiO2 composite film material
图 3 β-FeOOH/TiO2复合薄膜的Raman图谱
Figure 3. Raman spectra of β-FeOOH/TiO2 composite film material
图 4 β-FeOOH/TiO2复合薄膜的FTIR图谱
Figure 4. FTIR spectra of β-FeOOH/TiO2 composite film material
图 5 TNR和β-FeOOH/TiO2复合薄膜材料表面((a), (c))和截面((b), (d))的SEM图像
Figure 5. Typical SEM images of TNR and β-FeOOH/TiO2 composite film material with surface ((a), (c)) and cross-sectional ((b), (d)) views
图 6 β-FeOOH/TiO2复合薄膜材料的UV-vis DRS图(a)及带隙外推图(b)
Figure 6. UV-vis DRS diagram (a) and band gap extrapolation diagram (b) of β-FeOOH/TiO2 composite film material
图 7 可见光照射下β-FeOOH/TiO2光催化剂降解甲基橙(MO)曲线
Figure 7. Degradation curve of methyl orange (MO) by β-FeOOH/TiO2 photocatalyst under visible light irradiation
C0—Initial concentration of MO; Ct— Concentration of MO solution at time t
图 8 β-FeOOH/TiO2复合薄膜材料光催化降解MO的循环实验
Figure 8. Photocatalytic degradation rates of MO after repeated cycles by β-FeOOH/TiO2 composite film material
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