Fe掺杂g-C3N4光催化剂的制备及光催化性能研究

doi:10.3969/j.issn.1674-0696.2019.11.09

摘要/Abstract

摘要： 光催化剂g-C3N4因具降解汽车尾气特性受到广泛关注，但其在路面低降解效率限制了其应用。采用金属元素对g-C3N4改性，制备高活性光催化剂Fe-C3N4，并采用分散液喷涂法将其在路面上应用，以NO降解率来评价Fe-C3N4的光催化活性。结果表明：当Fe掺杂量为1%时，样品对NO降解率为75.43%，显著高于g-C3N4(50.78%)。紫外-可见(UV-Vis)光谱和荧光发射(PL)光谱结果表明：Fe掺杂改变了g-C3N4能带结构，降低了带隙能，提高了可见光的利用率。X射线衍射(XRD)和傅里叶变换红外(FT-IR)光谱结果表明：Fe掺杂并未改变g-C3N4晶体结构。由扫描电镜(SEM)观察到Fe掺入改善了g-C3N4的团聚情况，细化晶粒尺寸，从而增大了比表面积。对分散液喷涂沥青试件进行NO降解试验，结果表明：分散液喷涂法具有较好的实际降解效果。

关键词: 道路工程, 光催化剂, Fe掺杂, 汽车尾气, NO

Abstract: Photocatalyst g-C3N4 has attracted wide attention due to their ability to degrade automotive exhaust. However, its low degradation efficiency in the road has limited its application. The high activity photocatalyst Fe-C3N4 was prepared by modifying g-C3N4 with metal elements, and it was applied on the road surface by the dispersion spray method. The photocatalytic activity of Fe-C3N4 was evaluated by the NO degradation rate. The results indicate that when Fe content is 1%, the degradation rate of NO is 75.43%, which is significantly higher than that of g-C3N4 (50.78%). The spectra of UV-Vis and PL show that Fe doping changes the band structure of g-C3N4, reduces the band gap energy and improves the utilization of visible light. The spectra of XRD and FT-IR show that Fe doping does not change the crystal structure of g-C3N4. It is observed by SEM that Fe doping improves the agglomeration of g-C3N4 and refines the grain size, which increases the specific surface area. No degradation test was carried out on the asphalt samples sprayed with the dispersion. The results show that the dispersion spraying method has a better practical degradation effect.

Key words: highway engineering, photocatalyst, Fe-doped, automobile exhaust, NO

中图分类号:

U414

曹雪娟1,2，单柏林1，邓梅1，唐伯明1. Fe掺杂g-C3N4光催化剂的制备及光催化性能研究[J]. 重庆交通大学学报（自然科学版）, 2019, 38(11): 52-57.

CAO Xuejuan1,2, SHAN Bailin1, DENG Mei1, TANG Boming1. Preparation and Photocatalytic Properties of Fe-Doped g-C3N4 Photocatalyst[J]. Journal of Chongqing Jiaotong University(Natural Science), 2019, 38(11): 52-57.

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