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以尿素和硝酸铁为原料,采用浸渍法制备了不同Fe掺杂量的氮化碳复合催化剂,通过X射线衍射光谱(XRD)、傅里叶红外光谱(FT-IR)、X光电子能谱(XPS)、紫外可见漫反射光谱等分析手段对催化剂进行了表征.结果表明,Fe的引入并未改变氮化碳的石墨相结构,且有效降低了氮化碳催化剂的禁带宽度,拓宽了催化剂对可见光的响应范围,提高了催化剂对可见光的利用率.光催化降解甲基橙(MO)的结果表明,不同Fe掺杂量复合催化剂的光催化活性明显优于单纯的氮化碳催化剂,其中以硝酸铁与氮化碳质量比为15%的掺杂量为最佳,反应6h降解率达到81.7%,4次循环使用后,催化剂稳定性较好.此外,该体系的光催化机理研究表明,O·-2是光催化体系中的主要活性物种.
Using urea and ferric nitrate as raw materials, the carbon nitride composite catalysts with different Fe doping amount were prepared by impregnation method and characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy XPS and UV-Vis diffuse reflectance spectroscopy were used to characterize the catalyst.The results showed that the introduction of Fe did not change the graphite phase structure of the carbon nitride and effectively reduced the forbidden band width of the carbon nitride catalyst and broadened the catalyst Visible light response range, improve the utilization of visible light by the catalyst photocatalytic degradation of methyl orange (MO) results show that the photocatalytic activity of different Fe doped composite catalyst was significantly better than pure carbon nitride catalyst, wherein The optimal reaction conditions were as follows: the best doping amount was 15% of the mass ratio of ferric nitrate and carbon nitride, the degradation rate reached 81.7% after 6h reaction, and the stability of the catalyst was good after 4 cycles. , O · -2 is the main active species in the photocatalytic system.