Regulating the Si/Al ratio of g-C3N4/HBeta to improve adsorption and catalytic activity for enhancing photocatalytic pollutant degradation and H2 production

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Structure Pub Date : 2025-03-24 DOI:10.1016/j.molstruc.2025.142156

RuoKun Jia , PengPeng Wang , XiaoHang Yang , DuMin Li , JianGuo Qiao , TianXiang Li , JiaHui Chen

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Abstract

The rational modulation of the Si/Al ratio within molecular sieves holds utmost significance for augmenting photocatalytic activity. In this context, g-C₃N₄/HBeta composite photocatalysts were synthesised via a straightforward in situ thermal polymerisation procedure employing HBeta molecular sieves possessing multiple active sites and diverse Si/Al ratios. Through the variation of Si/Al ratios, the adsorption capacity, photogenerated carrier complexation efficiency, and active site characteristics could be effectively manipulated. The catalyst with the smallest Si/Al ratio (HBeta₂₅) exhibited the highest catalytic activity, with a hydrogen production efficiency of 2.346 mmol g⁻¹. This value was 4.9 times higher than that of pure g-C₃N₄, and the degradation efficiency of RhB was 3 times that of pure g-C₃N₄. The catalytic proficiency was principally validated by employing a comprehensive suite of techniques, including XPS, BET, SEM, and NH₃-TPD. Our results demonstrate for the first time the strong potential of zeolite Si/Al ratio to modulate the catalytic activity of photocatalysts.

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来源期刊

Journal of Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

期刊介绍： The Journal of Molecular Structure is dedicated to the publication of full-length articles and review papers, providing important new structural information on all types of chemical species including: • Stable and unstable molecules in all types of environments (vapour, molecular beam, liquid, solution, liquid crystal, solid state, matrix-isolated, surface-absorbed etc.) • Chemical intermediates • Molecules in excited states • Biological molecules • Polymers. The methods used may include any combination of spectroscopic and non-spectroscopic techniques, for example: • Infrared spectroscopy (mid, far, near) • Raman spectroscopy and non-linear Raman methods (CARS, etc.) • Electronic absorption spectroscopy • Optical rotatory dispersion and circular dichroism • Fluorescence and phosphorescence techniques • Electron spectroscopies (PES, XPS), EXAFS, etc. • Microwave spectroscopy • Electron diffraction • NMR and ESR spectroscopies • Mössbauer spectroscopy • X-ray crystallography • Charge Density Analyses • Computational Studies (supplementing experimental methods) We encourage publications combining theoretical and experimental approaches. The structural insights gained by the studies should be correlated with the properties, activity and/ or reactivity of the molecule under investigation and the relevance of this molecule and its implications should be discussed.