Page 77 - 《精细化工》2023年第9期

第 40 卷第 9 期 精 细 化 工 Vol.40, No.9
20 23 年 9 月 FINE CHEMICALS Sept. 2023

功能材料
超薄氧掺杂 g-C N 纳米片的制备及其光催化性能
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3

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张直峰，王介楷，张 颖，马 明，王 凯，杨佳佳
（山西师范大学 生命科学学院，山西 太原 030031）

摘要：以 H 2 SO 4 与 KMnO 4 为氧化剂，通过对热聚合法合成的原始石墨相氮化碳（g-C 3 N 4 ）超声辅助氧化剥离，
制备了超薄氧掺杂 g-C 3 N 4 纳米片。基于 HRTEM、XRD、AFM、XPS 表征，考察了超声辅助氧化剥离对原始 g-C 3 N 4
形貌、结构的影响；通过可见光催化降解刚果红分析了超薄氧掺杂 g-C 3 N 4 纳米片的光催化性能；通过
UV-Vis-DRS、EIS、PL 探究了超薄氧掺杂 g-C 3 N 4 纳米片光催化性能的增强机制。结果表明，对原始 g-C 3 N 4 超
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声辅助氧化剥离 6 h，可获得比表面积为 58.45 cm /g、厚度为 1.08 nm 的超薄氧掺杂 g-C 3 N 4 纳米片，此超薄氧掺
杂 g-C 3 N 4 纳米片（质量浓度为 200 mg/L）对刚果红水溶液（质量浓度为 20 mg/L）在 120 min 时可实现 83.1%
的降解率，具有良好的光催化性能，其原因在于超薄氧掺杂 g-C 3 N 4 纳米片比原始 g-C 3 N 4 更有利于催化活性位点
的暴露与光生载流子的分离传输。
关键词：g-C 3 N 4 ；超薄纳米片；超声辅助氧化剥离；光催化；功能材料
中图分类号：TB383.1；O643.36；O644.1 文献标识码：A 文章编号：1003-5214 (2023) 09-1925-09

Preparation and photocatalytic performance of ultrathin
oxygen-doped g-C 3N 4 nanosheets

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ZHANG Zhifeng, WANG Jiekai, ZHANG Ying, MA Ming, WANG Kai, YANG Jiajia
（School of Life Science, Shanxi Normal University, Taiyuan 030031, Shanxi, China）

Abstract: Ultrathin oxygen-doped g-C 3N 4 nanosheets were prepared from ultrasound-assisted oxidative
exfoliation of thermally polymerized graphite phase carbon nitride (g-C 3N 4) using H 2SO 4 and KMnO 4 as
oxidant. The effects of ultrasound-assisted oxidative exfoliation on the morphology and structure of pristine
g-C 3N 4 were investigated by HRTEM, XRD, AFM and XPS. The ultrathin oxygen-doped g-C 3N 4
nanosheets were further evaluated for its photocatalytic performance on Congo Red degradation under
visible light, followed by analysis on its photocatalytic activity enhancement mechanism by means of
UV-Vis-DRS, EIS and PL. The results showed that the ultrathin oxygen-doped g-C 3N 4 nanosheets with a
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specific surface area of 58.45 cm /g and thickness of 1.08 nm was obtained from 6 h ultrasound-assisted
oxidative exfoliation of pristine g-C 3N 4. The degradation rate of Congo Red aqueous solution with a mass
concentration of 20 mg/L catalyzed by the ultrathin oxygen-doped g-C 3N 4 nanosheets (mass concentration
of 200 mg/L) was 83.1% at 120 min. This good photocatalytic performance was attributed to the fact that
the ultrathin oxygen-doped g-C 3N 4 nanosheets had more active sited exposed and was more conducive to
the separation and transport of photogenerated carriers than the pristine g-C 3N 4.
Key words: g-C 3 N 4; ultrathin nanosheets; ultrasound-assisted oxidative exfoliation; photocatalysis; functional
materials

石墨相氮化碳（g-C 3 N 4 ）作为一种可见光响应 光催化水解制氢、CO 2 转化、环境污染物处理等领
碳基半导体光催化剂，因具有吸收光谱范围宽、结 域展现出广阔的应用前景 [1-3] 。但采用常规热聚合方
构可调、物理化学稳定性高、绿色廉价等特性，在 法制备的 g-C 3N 4 通常存在可见光响应范围窄、电子-

收稿日期：2023-06-29; 定用日期：2023-07-21; DOI: 10.13550/j.jxhg.20230527
基金项目：山西省基础研究计划项目（202203021221123）、山西省回国留学人员科研项目（2022-122）
作者简介：张直峰（1980—），男，副教授，E-mail：zzfsx2012@126.com。联系人：杨佳佳（1983—），女，副教授，E-mail：
jjyang2009@126.com。