Preparation and Photocatalytic Performance of 1T/2H O-MoS2@S-pCN Composite Catalyst in Degradation of Hexavalent Chromium and Ciprofloxacin

doi:10.11901/1005.3093.2024.431

Chinese Journal of Materials Research

2025, Vol. 39

Issue (7): 551-560 DOI: 10.11901/1005.3093.2024.431

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Preparation and Photocatalytic Performance of 1T/2H O-MoS₂@S-pCN Composite Catalyst in Degradation of Hexavalent Chromium and Ciprofloxacin

LIU Zhihua¹^,², WANG Mingyue¹^,², LI Yijuan¹^,², QIU Yifan¹^,², LI Xiang³(

), SU Weizhao¹^,²

^1.School of Hydraulic and Ocean Engineering, Changsha University of Science & Technology, Changsha 410114, China
^2.Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha 410114, China
^3.Changsha Drainage Liability Co., Ltd., Changsha 410015, China

Cite this article:

LIU Zhihua, WANG Mingyue, LI Yijuan, QIU Yifan, LI Xiang, SU Weizhao. Preparation and Photocatalytic Performance of 1T/2H O-MoS₂@S-pCN Composite Catalyst in Degradation of Hexavalent Chromium and Ciprofloxacin. Chinese Journal of Materials Research, 2025, 39(7): 551-560.

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Abstract

A novel visible-light-driven 1T/2H O-MoS₂@S-pCN photocatalyst was synthesized in situ on sulfur-doped g-C₃N₄ nanosheets (S-pCN) via hydrothermal method with N, N-dimethylformamide (DMF) as solvent. The prepared 1T/2H O-MoS₂@S-pCN photocatalyst was characterized by means of XRD, XPS, FT-IR, SEM and UV-vis. The photoelectrochemical properties of the catalyst and the oxidation-reduction behavior of the mixture of ciprofloxacin (CIP) and hexavalent chromium (Cr(VI)) induced by the catalyst were also studied. The results showed that if 15% 1T/2H O-MoS₂@S-pCN photocatalyst was introduced into the mixed solution, the removal rate of CIP and Cr(VI) could reach 97.63% within 2 min and 96.2% within 10 min respectively. Furthermore, after five cycle of use, the excellent photocatalytic performance of the catalyst remained unchanged. The excellent performance of the photocatalyst may be attributed to the existence of heterojunctions, the 1T/2H molybdenum disulfide phase with peculiar structure and oxygen doping in the 1T/2H O-MoS₂@S-pCN photocatalyst, which could improve its visible light response and effectively inhibit the electron-hole pair recombination. The mechanism related with the removal of CIP and Cr(VI) by this catalyst may be that CIP was oxidized by active substances (h⁺, e^-, ∙O $2 -$ ), and Cr(VI) was reduced by active substances (e^-, ∙O $2 -$ ).

Key words: inorganic non-metallic materials 1T/2H O-MoS₂@S-pCN photocatalysis hexavalent chro-mium ciprofloxacin

Received: 22 October 2024

ZTFLH:

X703.1

Fund: Youth Teachers Growth Plan Project at Changsha University of Science and Technology(2019QJCZ038)

Corresponding Authors: LI Xiang, Tel: 13467516628, E-mail: 14410876@qq.com

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	LIU Zhihua
	WANG Mingyue
	LI Yijuan
	QIU Yifan
	LI Xiang
	SU Weizhao

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https://www.cjmr.org/EN/10.11901/1005.3093.2024.431 OR https://www.cjmr.org/EN/Y2025/V39/I7/551

Fig.1 XRD patterns of 1T/2H O-MoS₂@S-pCN and S-pCN

Fig.2 XPS analysis of 15% 1T/2H O-MoS₂@S-pCN

Fig.3 FT-IR analysis of S-pCN and 1T/2H O-MoS₂@S-pCN

Fig.4 SEM images of 1T/2H O-MoS₂@S-pCN (a) 5%1T/2H O-MoS₂@S-PCN, (b) 10%1T/2H O-MoS₂@S-PCN, (c) 15%1T/2H O-MoS₂@S-PCN, (d) 20%1T/2H O-MoS₂@S-PCN

Fig.5 Element mapping of 15% 1T/2H O-MoS₂@S-pCN

Fig.6 UV-vis diffuse reflectance spectra (a) and Tauc plots (b) of S-pCN and 1T/2H O-MoS₂@S-pCN

Fig.7 Nyquist plots (a) and transient photocurrent responses (b) of S-pCN and 1T/2H O-MoS₂@S-pCN

Fig.8 Mott-Schottky plots of S-pCN和1T/2H O-MoS₂@S-pCN

Fig.9 Performance of photocatalytic synergistic treatment of CIP (a) and Cr(VI)(b) by S-pCN and 1T/2H O-MoS₂@S-pCN

Fig.10 Cyclic photocatalytic degradation of CIP (a) and Cr(VI) (b) by 15%1T/2H O-MoS₂@S-pCN and XRD patterns before and after use of the catalyst (c)

Fig.11 Effect of free radical scavenger on the photo-catalytic degradation of 15% 1T/2H O-MoS₂@S-pCN (a) CIP, (b) Cr(VI)

Fig.12 Mechanism of 1T/2H O-MoS₂@S-pCN photocatalytic synergistic treatment of CIP and Cr(VI)

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