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

doi:10.11901/1005.3093.2024.503

Chinese Journal of Materials Research

2025, Vol. 39

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

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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

Cite this article:

WANG Binglin, CHAI Yifeng, TAN Shengxia, GUO Shengwei, JIANG Ru, ZHU Zhonghua, ZHANG Yutao, HUANG Guifang, HUANG Weiqing. Construction and Photocatalytic Performance Study of g-C₃N₄/CdS S-scheme Heterojunction. Chinese Journal of Materials Research, 2025, 39(9): 712-720.

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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

Received: 19 December 2024

ZTFLH:

O643.36

Fund: Major Program of Hunan Education Department(23A0355);Excellent Youth of Hunan Education Department(23B0482)

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

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	Articles by authors
	WANG Binglin
	CHAI Yifeng
	TAN Shengxia
	GUO Shengwei
	JIANG Ru
	ZHU Zhonghua
	ZHANG Yutao
	HUANG Guifang
	HUANG Weiqing

URL:

https://www.cjmr.org/EN/10.11901/1005.3093.2024.503 OR https://www.cjmr.org/EN/Y2025/V39/I9/712

Fig.1 Synthesis flow diagram (a), catalytic degradation flow diagram (b) of binary composite nanomaterials GCS

Fig.2 Absorption spectra of CN (a), CdS (b), GCS(0.5%) (c), GCS(1%) (d) and GCS(2%) (e)

Fig.3 SEM image of g-C₃N₄ (a); SEM images with CdS (b); SEM image of composite GCS at 5 μm (e) and SEM image locally enlarged to 1 μm (d), and distribution of elements (c) and energy spectrum (f) in GCS of composite materials

Fig.4 XRD patterns of CN, CdS, GCS (0.5%),GCS (1%) and GCS (2%)

Fig.5 Fluorescence spectra of GCS(1%) composite samples at different excitation wavelengths (a) and each sample at the same excitation wavelength (b)

Fig.6 Total XPS spectra (a) GCS, CN, CdS and their orbital electron spectra (b) C 1s; (c) N 1s; (d) Cd 3d and (e) S 2p

Fig.7 Degradation curves (a) and dynamic curves (b) of MB under different catalysts

Fig.8 Cyclic degradation diagram (a) and degradation column diagram (b) of GCS (1%) catalyst

Fig.9 Reactivity capture using GCS(1%) heterojunction

Fig.10 Work functions of CN (a), CdS (b) and GCS (c)

Fig.11 Mechanism of MB degradation by binary composite photocatalyst (GCS)

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