摘要：

对氮化碳（C₃N₄）进行氮掺杂碳纳米管（N-Ct）修饰，形成的氮掺杂碳纳米管/氮化碳（N-Ct/C₃N₄）复合材料的光催化活性明显提高。在可见光条件下，复合材料对罗丹明B（RhB）有较好的降解效果，其中5%N-Ct/C₃N₄（理论N-Ct质量分数为5%）在2 h内对RhB的降解率可达99.0%，相应的TOC去除率为59.0%，降解性能最为卓越且显著高于普通C₃N₄材料。利用X射线衍射、光电子能谱、紫外-可见光吸收光谱等多元表征手段对复合材料进行理化性质表征和理论计算，结果表明，经N-Ct修饰后，复合材料的禁带宽度变窄，其对可见光的吸收能力有所增强；N-Ct还可利用自身极强的导电特性迅速转移C₃N₄激发产生的光生电子，有利于提高光生电子和空穴的分离效率，提升复合材料的可见光催化活性。N-Ct/C₃N₄复合材料显示出其作为高效光催化材料处理染料等工业污染废水的卓越潜力。

关键词: 光生电子, 氮化碳, 可见光催化, 氮掺杂碳纳米管

Abstract:

The nitrogen doped carbon nanotubes/carbon nitride（N-Ct/C₃N₄） composite，synthesized via the modification of carbon nitride（C₃N₄） using N-doped carbon nanotube（N-Ct），had better photocatalytic performance. Under visible light conditions，the composite material had a good degradation effect on Rhodamine B（RhB）. The degradation efficiency of RhB by 5%N-Ct/C₃N₄（theoretical mass ratio of N-Ct was 5%） could reach 99.0% within 2 hours，and the corresponding TOC removal efficiency was 59.0%. The composite showed best removal efficiency and was much better than common C₃N₄. Through multiple characterizations such as XRD，XPS and UV-vis，the physical and chemical characterizations of the composite and theoretical calculations revealed that after N-Ct modified，the band gap of the composite became narrower，and its ability to absorb visible light was enhanced. N-Ct could also rapidly transfer the photogenerated electrons excited by C₃N₄ for its own excellent conductivity，which was conducive to improving the separation efficiency of photogenerated electrons and holes，and improving the visible light catalytic activity of the composite. The N-Ct/C₃N₄ composite presented its excellent potential as a high-efficiency photocatalytic material for the treatment of industrial polluted wastewater such as dyes.

Key words: photogenerated electron, carbon nitride, visible light photocatalysis, N-doped carbon nanotube

中图分类号: 

• X703.1