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Materials 2018, 11(6), 939; https://doi.org/10.3390/ma11060939

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

1
Department of Safety, Health and Environmental Engineering, Hungkuang University, Taichung 43302, Taiwan
2
Hsuteng Consulting International Co., Ltd. Taichung 40764, Taiwan
3
Institute of Environment Engineering and Management, National Taipei University of Technology, Taipei 10643, Taiwan
*
Author to whom correspondence should be addressed.
Received: 12 April 2018 / Revised: 20 May 2018 / Accepted: 30 May 2018 / Published: 3 June 2018
(This article belongs to the Special Issue Novel Photoactive Materials)
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Abstract

Using Ti(OC4H9)4 as a precursor, Fe(NO3)3⋅9H2O 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/cm2; moreover, the efficiency of the AO7 degradation increased when the pH decreased with maximum efficiency at pH 3. View Full-Text
Keywords: Fe/N-TiO2; sol-gel; hydrothermal; photocatalytic; visible-light Fe/N-TiO2; sol-gel; hydrothermal; photocatalytic; visible-light
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Cheng, H.-H.; Chen, S.-S.; Yang, S.-Y.; Liu, H.-M.; Lin, K.-S. Sol-Gel Hydrothermal Synthesis and Visible Light Photocatalytic Degradation Performance of Fe/N Codoped TiO2 Catalysts. Materials 2018, 11, 939.

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