Sol-Gel Hydrothermal Synthesis and Visible Light Photocatalytic Degradation Performance of Fe/N Codoped TiO2 Catalysts

被引:27
作者
Cheng, Hsu-Hui [1 ,2 ]
Chen, Shiao-Shing [3 ]
Yang, Sih-Yin [3 ]
Liu, Hui-Ming [1 ]
Lin, Kuang-Shan [3 ]
机构
[1] Hungkuang Univ, Dept Safety Hlth & Environm Engn, Taichung 43302, Taiwan
[2] Hsuteng Consulting Int Co Ltd, Taichung 40764, Taiwan
[3] Natl Taipei Univ Technol, Inst Environm Engn & Management, Taipei 10643, Taiwan
关键词
Fe; N-TiO2; sol-gel; hydrothermal; photocatalytic; visible-light; DOPED TIO2; WASTE-WATER; NITROGEN; TITANIA;
D O I
10.3390/ma11060939
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Using Ti(OC4H9)(4) as a precursor, Fe(NO3)(3)9H(2)O as the source of iron, and NH4NO3 as the source of nitrogen, an Fe/N codoped TiO2 catalyst was prepared using a sol-gel hydrothermal method. The as-prepared powders were characterized using X-ray powder diffraction, electron spectroscopy for chemical analysis, Fourier-transform infrared spectroscopy, and ultraviolet-visible spectrophotometry. Fe and N codoping resulted in decreased crystallite size and increased specific surface area. Results of the photocatalytic degradation of acid orange 7 (AO7) in a continuous-flow fluidized-bed reactor indicated that the maximum decolorization (more than 90%) of AO7 occurred with the Fe/N-TiO2 catalyst (dosage of 20 g/L) when a combination of visible light irradiation for 10 h HRT (hydraulic retention time), and a heterogeneous system was used. The AO7 degradation efficiency was considerably improved by increasing the hydraulic retention time from 2.5 to 10 h or by reducing the initial AO7 concentration from 300 to 100 mg/L. The reaction rate increased with the light intensity and the maximum value occurred at 35 mW/cm(2); moreover, the efficiency of the AO7 degradation increased when the pH decreased with maximum efficiency at pH 3.
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页数:9
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