g-C3N4/CdS S型异质结复合光催化材料的制备及其性能

doi:10.11901/1005.3093.2024.503

材料研究学报

2025, Vol. 39

Issue (9): 712-720 DOI: 10.11901/1005.3093.2024.503

研究论文

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g-C₃N₄/CdS S型异质结复合光催化材料的制备及其性能

王炳林¹^,², 柴一峰¹^,²(

), 谭圣霞¹^,², 郭升伟¹^,², 姜如¹^,², 朱中华¹^,², 张禹涛¹^,², 黄桂芳³, 黄维清³

^1.湖南科技大学物理与电子科学学院湘潭 411201
^2.湖南科技大学智能传感器与新型传感材料湖南省重点实验室湘潭 411201
^3.湖南大学物理与微电子科学学院长沙 410082

Construction and Photocatalytic Performance Study of g-C₃N₄/CdS S-scheme Heterojunction

WANG Binglin¹^,², CHAI Yifeng¹^,²(

), TAN Shengxia¹^,², GUO Shengwei¹^,², JIANG Ru¹^,², ZHU Zhonghua¹^,², ZHANG Yutao¹^,², HUANG Guifang³, HUANG Weiqing³

^1.School of Physics and Electronics Science, Hunan University of Science and Technology, Xiangtan 411201, China
^2.Key Laboratory of Intelligent Sensor and Advance Materials of Hunan Province, Hunan University of Science and Technology, Xiangtan 411201, China
^3.School of Physics and Electronics, Hunan University, Changsha 410082, China

引用本文:

王炳林, 柴一峰, 谭圣霞, 郭升伟, 姜如, 朱中华, 张禹涛, 黄桂芳, 黄维清. g-C₃N₄/CdS S型异质结复合光催化材料的制备及其性能[J]. 材料研究学报, 2025, 39(9): 712-720.
Binglin WANG, Yifeng CHAI, Shengxia TAN, Shengwei GUO, Ru JIANG, Zhonghua ZHU, Yutao ZHANG, Guifang HUANG, Weiqing HUANG. Construction and Photocatalytic Performance Study of g-C₃N₄/CdS S-scheme Heterojunction[J]. Chinese Journal of Materials Research, 2025, 39(9): 712-720.

全文: PDF(10635 KB) HTML

摘要:

用水热法将CdS与煅烧的g-C₃N₄复合制备出g-C₃N₄/CdS S型异质结复合光催化材料，使用SEM、XRD、PL和XPS等手段对其表征并进行功函数测试和自由基捕获实验，研究了这种材料的光催化性能。结果表明，在模拟太阳光(氙灯)的照射下，这种光催化材料(g-C₃N₄质量分数为1%)对甲基蓝污染物(MB)的降解率为99.62% (是纯g-C₃N₄降解效率的12倍)；循环降解三次后其降解率仍然达到82.64%，表明其稳定性良好。其原因是，在这种材料的g-C₃N₄和CdS之间形成了S型异质结，电子通过其界面从CdS转移到g-C₃N₄上产生了内建电场，实现了光生电子和空穴在空间上的高速转移，使催化剂具有较强的氧化还原性能。

关键词 ：复合材料, g-C₃N₄/CdS, S型异质结, 水热法

Abstract：

A S-type heterojunction composite photocatalyst of g-C₃N₄/CdS was synthesized by hydrothermal method. The composite material was characterized by SEM, XRD, PL, and XPS. Its photocatalytic performance was evaluated by work function test and free radical trapping test. Under a simulated sunlight irradiation (Xenon lamp), the degradation rate of methylene blue reached 99.62% when in a 10 mg/L methyl blue suspension with addition of with photocatalytic material* containing g-C₃N₄-1%CdS, which was 12.11 times higher than that of blank g-C₃N₄. After three cycles, the photocatalytic degradation rate of the catalyst still reached 82.64%, indicating good stability. The enhanced photocatalytic activity may be attributed to the formation of a S-type heterojunction between g-C₃N₄ and CdS, where electrons transfer from CdS to g-C₃N₄, creating a built-in electric field that facilitates rapid separation of photogenerated electrons and holes in space, resulting in a strong redox capability of the catalyst. This study may provide a valuable reference for the design and development of high-performance photocatalytic materials.

Key words： composite g-C₃N₄/CdS S-type heterojunction hydrothermal method

收稿日期: 2024-12-19

ZTFLH:

O643.36

基金资助:湖南省教育厅重点项目(23A0355);湖南省教育厅优秀青年项目(23B0482)

通讯作者: 柴一峰，博士，yfc@hnust.edu.cn，研究方向为纳米复合材料制备及其光催化

Corresponding author: CHAI Yifeng, Tel: 15116263919, E-mail: yfc@hnust.edu.cn

作者简介: 王炳林，男，2001年生，硕士生

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	王炳林
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	姜如
	朱中华
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	黄桂芳
	黄维清
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https://www.cjmr.org/CN/10.11901/1005.3093.2024.503 或 https://www.cjmr.org/CN/Y2025/V39/I9/712

图1 二元复合纳米材料GCS的合成流程和催化降解流程

图2 CN、CdS、GCS(0.5%)、GCS(1%)和GCS(2%)的吸收光谱

图3 g-C3N4、CdS和复合材料GCS (5 μm且局部放大到1 μm)的SEM图像以及复合材料GCS中的元素分布和能谱

图4 CN，CdS，GCS (0.5%)，GCS (1%)和GCS (2%)复合材料的XRD谱

图5 不同波长激发GCS(1%)复合样品的荧光光谱和同一波长激发样品的荧光光谱

图6 GCS、CN、CdS、C 1s、N 1s、Cd 3d和S 2p的XPS总谱和轨道电子谱

图7 催化剂对MB的降解曲线及其动力学曲线

图8 GCS (1%)催化剂的循环降解图和降解柱状图

图9 GCS(1%)异质结对反应性物质的捕获

图10 CN、CdS 和GCS的功函数

图11 二元复合光催化剂(GCS)降解MB机理

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