高等学校化学学报 ›› 2025, Vol. 46 ›› Issue (4): 20240485.doi: 10.7503/cjcu20240485

• 物理化学 • 上一篇    下一篇

H3PO4质子化改性的g-C3N4及其光催化产H2O2性能

郑娜, 聂丽君, 高宇航, 薛坤坤, 韩晓蓓, 马跃宇, 任丽蓉, 苏王潮, 石建惠()   

  1. 太原理工大学环境与生态学院,太原 030024
  • 收稿日期:2024-10-25 出版日期:2025-04-10 发布日期:2025-01-08
  • 通讯作者: 石建惠 E-mail:shijianhui@tyut.edu.cn
  • 基金资助:
    国家自然科学基金(52100101)

H3PO4 Protonation-modified g-C3N4 and Its Photocatalytic H2O2 Production Properties

ZHENG Na, NIE Lijun, GAO Yuhang, XUE Kunkun, HAN Xiaobei, MA Yueyu, REN Lirong, SU Wangchao, SHI Jianhui()   

  1. College of Environmental Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China
  • Received:2024-10-25 Online:2025-04-10 Published:2025-01-08
  • Contact: SHI Jianhui E-mail:shijianhui@tyut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(52100101)

摘要:

以三聚氰胺为前驱体, 通过热缩聚法制备了块体石墨相氮化碳g-C3N4(BCN), 并利用不同浓度的H3PO4对BCN进行水热处理, 制备了质子化改性的g-C3N4(PBCN x ), 再经二甲基亚砜(DMSO)溶剂纯化, 得到相应的PBCN x -D样品. 通过X射线衍射(XRD)、 傅里叶变换红外光谱(FTIR)、 透射电子显微镜(TEM)、 X射线光电子能谱(XPS)、 元素分析(EA)和N2气吸附-脱附测试(BET)对样品进行了表征. 结果表明, PBCN x -D不仅保留了g-C3N4的原始结构, 而且具有松散的薄层结构、 更大的比表面积及更多的氨基缺陷, 这些特性提高了其光催化活性. 瞬态光电流(TPC)、 电化学阻抗(EIS)、 光致发光光谱(PL)和紫外-可见漫反射光谱(UV-Vis DRS)分析结果表明, PBCNx-D的光生电子-空穴对复合率明显降低. BCN在质子化过程中形成了光响应较差的蜜勒胺分子, 经DMSO溶剂纯化后, PBCN x -D的光电化学性能得到进一步提升. 在光催化产H2O2实验中, PBCN10-D表现出最佳的光催化活性, 光照5 h, H2O2产率为0.502 mmol/L, 为初始BCN的7.17倍.

关键词: 质子化石墨相氮化碳, 蜜勒胺, 可见光, 光催化产过氧化氢

Abstract:

In this study, bulk graphite phase carbon nitride g-C3N4(BCN) was prepared by using melamine as the precursor, BCN was hydrothermally treated with different concentrations of H3PO4, to prepare protonated modified g-C3N4(PBCN x ), and then PBCN x was purified by DMSO solvent to obtain the corresponding PBCNx-D sample. The structural morphology of the sample was characterized by X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), transmission electron microscope(TEM), and X-ray photoelectron spectroscopy(XPS). The results prove that PBCN x -D not only retains the original structure of g-C3N4, but also has a thin layer structure, larger surface area and more amino defects, and these properties enhance its photocatalytic activity. The analysis of transient photocurrent(TPC), electrochemical impedance(EIS), photoluminescence spectrum(PL) and UV-visible diffuse reflection spectrum(UV-Vis DRS) show that the electron-hole recombination of PBCN x -D is significantly reduced. It is worth noting that BCN forms poorly photoresponsive melem molecules during the protonation process. After purification with DMSO solvent, the photoelectrochemical properties of PBCN x -D are further improved. In the experiment of photocatalytic production of H2O2, PBCN10-D shows the best photocatalytic activity, with a H2O2 yield of 0.502 mmol/L after 5 h of light irradiation, which is 7.17 times than that of the initial BCN.

Key words: Protonated g-C3N4, Melem, Visible light, Photocatalytic production of hydrogen peroxide

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