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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (2): 684-694.DOI: 10.16552/j.cnki.issn1001-1625.2025.0798

• 功能材料 • 上一篇    下一篇

N掺杂TiO2的制备及其光催化降解四环素的性能研究

杨帅(), 李霞, 姚梦琴(), 刘飞   

  1. 贵州大学化学与化工学院,贵阳 550025
  • 收稿日期:2025-08-07 修订日期:2025-09-29 出版日期:2026-02-20 发布日期:2026-03-09
  • 通信作者: 姚梦琴,博士,讲师。E-mail:mqyao@gzu.edu.cn
  • 作者简介:杨帅(1999—),男,硕士研究生。主要从事光催化材料的研究。E-mail:shuai990323@163.com
  • 基金资助:
    贵州省碳基能源分子化学利用技术重点实验室(2023008);贵州省基础研究计划青年引导项目(黔科合基础QN〔2025〕063)

Synthesis of Nitrogen-Doped TiO2 and Its Photocatalytic Performance in Tetracycline Degradation

YANG Shuai(), LI Xia, YAO Mengqin(), LIU Fei   

  1. College of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,China
  • Received:2025-08-07 Revised:2025-09-29 Published:2026-02-20 Online:2026-03-09

摘要:

光催化是降解四环素(TC)的一种有效方法,而实现这个过程的关键是光催化材料。二氧化钛(TiO2)是一种高效、无污染的光催化材料,但存在光生载流子复合率高和紫外光响应范围窄的问题。本研究针对TiO2的缺陷,采用梯度N掺杂策略对海胆状TiO2进行改性。通过原位水热构建N掺杂TiO2材料体系,系统揭示N掺杂浓度对光催化剂结构及其性能的调控规律。实验结果表明,当氮钛摩尔比(nNnTi)为5时,制备的光催化剂(5N-TiO2)光催化性能最佳,在可见光照射120 min下对TC的降解率达到64%,较未掺杂TiO2提升了137%。表征分析表明,5N-TiO2因富含Ti3+和氧空位,通过协同作用将TiO2带隙能量从3.07 eV下降到2.60 eV,大幅提升了光生载流子分离速率。但进一步提高N掺杂浓度发现,过量的N会形成电子-空穴复合中心,从而缩短载流子的寿命,导致10N-TiO2nNnTi=10)的光催化性能降至未掺杂TiO2的41%。

关键词: TiO2, N掺杂, 光催化, 四环素, 电子-空穴, 带隙

Abstract:

Photocatalysis is an effective method for degrading tetracycline (TC), with photocatalytic materials serving as the core component of this process. Titanium dioxide (TiO2) is a highly efficient and environmentally friendly photocatalytic material. However, it suffers from rapid recombination of photogenerated carriers and a narrow ultraviolet light response range. To address these limitations, this study employed a gradient nitrogen (N)-doping strategy to modify sea-urchin-like TiO2. An in situ hydrothermal method was utilized to construct N-doped TiO2 materials, systematically elucidating the regulatory effects of N-doping concentration on the structure and performance of photocatalyst. Experimental result indicate that when the nitrogen-to-titanium ratio (nNnTi) is 5, the prepared photocatalyst (5N-TiO2) exhibits the best photocatalytic performance, achieving a 64% degradation rate for TC under 120 min of visible light irradiation. This represents a 137% enhancement compared to undoped TiO2. Characterization analysis reveals that 5N-TiO2, rich in Ti3+ and oxygen vacancies, synergistically narrows the band gap of TiO2 from 3.07 eV to 2.60 eV, and significantly improves the separation rate of photogenerated carriers. However, further increasing the N-doping concentration level shows that excessive N forms electron-hole recombination centers, thereby reducing carrier lifetime. Consequently, the photocatalytic performance of 10N-TiO2nNnTi=10) decrease to 41% of that of undoped TiO2.

Key words: TiO2, nitrogen doping, photocatalysis, tetracycline, electron-hole separation, band gap

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