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首页> 美国卫生研究院文献>Materials >Sol-Gel Hydrothermal Synthesis and Visible Light Photocatalytic Degradation Performance of Fe/N Codoped TiO2 Catalysts
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Sol-Gel Hydrothermal Synthesis and Visible Light Photocatalytic Degradation Performance of Fe/N Codoped TiO2 Catalysts

机译：Fe / N共掺杂TiO2催化剂的溶胶-凝胶水热合成及可见光催化降解性能

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摘要

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.
机译：以Ti（OC4H9）4为前驱体，Fe（NO3）3·9H2O为铁源，NH4NO3为氮源，采用溶胶-凝胶水热法制备了Fe / N共掺杂的TiO2催化剂。使用X射线粉末衍射，用于化学分析的电子光谱，傅立叶变换红外光谱和紫外可见分光光度法对所制备的粉末进行表征。 Fe和N共掺杂导致晶粒尺寸减小，比表面积增大。连续流化床反应器中酸性橙7（AO7）的光催化降解结果表明，Fe / N-TiO2催化剂（剂量为20 g / L）会发生AO7的最大脱色（超过90％）。 ）结合使用可见光照射10 h HRT（液压保留时间）和非均相系统的组合。通过将水力停留时间从2.5小时增加到10小时或将AO7的初始浓度从300 mg / L降低，可以显着提高AO7的降解效率。反应速率随光强度的增加而增加，最大值出现在35 mW / cm 2 。另外，当pH降低时，AO7降解的效率增加，在pH 3时达到最大效率。

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