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Interface design of S-scheme Co9S8/flower-like g-C3N4 van der Waals heterojunction with enhanced photocatalytic hydrogen production and tetracycline hydrochloride degradation
Yun Wang, Huage Lin, Jiaxiang Zong, Mengjiao Yu, Guangyu Wu, Weinan Xing*
https://doi.org/10.1016/j.cjsc.2025.100798
ABSTRACT
The construction of heterojunctions at phase interfaces represents a crucial strategy for enhancing photocatalytic activity, but developing more cost-effective and higher-performance photocatalysts remains a challenge. Herein, we designed a S-scheme van der Waals heterojunctions (vdWHs) photocatalyst by in situ growth of Co9S8 on flower-like graphitic carbon nitride (FCN). The S-scheme heterojunction ensures efficient charge separation and significantly enhances redox capabilities, while the vdWHs specifically overcome the lattice mismatch limitation inherent in conventional S-scheme heterojunctions owing to its interfacial coupling. In situ XPS analysis was used to confirm the direction of interfacial charge transfer. Consequently, the photocatalyst achieved an optimal H2 evolution of 948.04 μmol h-1 g-1 without Pt cocatalysts. The tetracycline hydrochloride degradation reached 97.90% within 9 min through photocatalytic peroxymonosulfate activation that generated multiple reactive oxygen species. Liquid chromatography-mass spectrometry was employed to identify the possible reaction pathways and investigate the degradation products. This work advanced a rational design of S-scheme Co9S8/FCN vdWHs photocatalysts and offered promising solutions for both renewable energy production and wastewater remediation.
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