工业水处理 ›› 2024, Vol. 44 ›› Issue (8): 99-106. doi: 10.19965/j.cnki.iwt.2023-0824

• 试验研究 • 上一篇    下一篇

易回收碳纤维/g-C3N4纳米片阵列制备及光催化和光电催化研究

张宏伟1(), 席晓晶2, 田文杰2, 张慧盈2, 马晓梦2, 魏敏洁2, 陈华军2()   

  1. 1. 郑州科技学院土木建筑工程学院, 河南 郑州 450064
    2. 洛阳理工学院环境工程与化学学院, 河南 洛阳 471023
  • 收稿日期:2024-06-28 出版日期:2024-08-20 发布日期:2024-09-26
  • 作者简介:

    张宏伟(1988— ),硕士,讲师。E-mail:

    陈华军,博士,教授。E-mail:

  • 基金资助:
    国家自然科学基金项目(41701306)

Flexible carbon-fiber/g-C3N4 nanosheet arrays as recyclable photocatalysts and photoelectrocatalysts

Hongwei ZHANG1(), Xiaojing XI2, Wenjie TIAN2, Huiying ZHANG2, Xiaomeng MA2, Minjie WEI2, Huajun CHEN2()   

  1. 1. Department of Civil Engineering and Architecture, Zhengzhou University of Science and Technology, Zhengzhou 450064, China
    2. School of Environment and Chemistry, Luoyang Institute of Science and Technology, Luoyang 471023, China
  • Received:2024-06-28 Online:2024-08-20 Published:2024-09-26

摘要:

在光催化降解领域,粉末g-C3N4光催化材料使用后在流体中分离和回收困难,同时也会产生二次污染。在氩气保护下,采用化学气相沉积法在三维碳纤维织物表面沉积g-C3N4纳米片,从而制备了易回收碳纤维/g-C3N4纳米片阵列光催化材料,研究了碳纤维/g-C3N4纳米片阵列的光学、电化学和光电催化性能。结果表明,g-C3N4纳米片可以吸收可见光产生光生电子和空穴,而碳纤维良好的导电性提高了易回收碳纤维/g-C3N4纳米片阵列光催化材料中光生电子/空穴的分离效率。降解240 min,易回收碳纤维/g-C3N4纳米片阵列光催化材料的电催化、光催化和光电催化对2,4-二硝基酚的降解率分别为20.7%、33.5%和99.5%。在光电催化过程中,外加偏电压加速了光生电子向阴极迁移,进一步提高了光生电子/空穴分离效率,使电催化和光催化存在协同效应。将粉末光催化材料与柔性碳纤维织物组合,提供了一种新的光催化材料组装方式,极大降低了粉末光催化材料的分离和回收成本。

关键词: 碳纤维, g-C3N4纳米片, 光催化, 光电催化

Abstract:

In the field of photocatalytic degradation, the separation and recycle technology of powdery g-C3N4 after usage has not been mature, which causes secondary pollution problems for large-scale industrial applications. In this paper, carbon-fiber/g-C3N4 nanosheet arrays were fabricated by chemical vapor deposition(CVD) under argon protection, and the optical, electrochemical and photocatalytic performance of carbon-fiber/g-C3N4 nanosheet arrays were studied. The results indicated that carbon-fiber/g-C3N4 nanosheet arrays generated photon-excited electrons and holes under visible light irradiation during photocatalytic process. The excellent electrical conductivity of carbon fiber could trap photon-excited electrons in conduction band of g-C3N4 nanosheet and creat holes in valence band of g-C3N4 nanosheet. 20.7%, 33.5% and 99.5% of 2, 4-dinitrophenol were degraded by photocatalysis, electrocatalysis and photoelectrocatalysis of carbon-fiber/g-C3N4 nanosheet arrays within 240 min. The external voltage further enhanced the separation of photo-generated electrons and holes, which made the photoelectrocatalysis of carbon-fiber/g-C3N4 nanosheet arrays exerted unexpected performance through synergistic interactions of photocatalysis and electrocatalysis. The assembly of powdery photocatalysts and carbon fibers textile might provide a general methodology in the design of separable and recyclable photocatalysts with broad applications in environment-related fields. The assembly strategy developed herein significantly reduced the separable and recyclable cost of powdery photocatalysts and offered valuables references for industrial application of photocatalysis and photoelectrocatalysis.

Key words: flexible carbon-fiber, g-C3N4 nanosheet, photocatalyst, photoelectrocatalyst

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