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Enhancements on volatile organic compounds (VOCs) adsorption and desorption performance of ZSM-5 by fabricating hierarchical MCM-41

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Abstract

ZSM-5 zeolite has been considered a promising adsorbent for capturing VOCs. However, its hydrophilicity and narrow micropore structure limit their practical application especially under humid atmospheres. In this study, the pure silica mesoporous molecular sieve MCM-41 was assembled on ZSM-5 zeolite with different SiO2/Al2O3 ratios (SARs) via a surfactant-mediated recrystallization method. Then, its adsorption-desorption behaviors were investigated using n-hexane, toluene, and ethyl acetate as VOC model molecules. The results showed that the hydrophobicity of ZSM-5/MCM-41 composites and their VOC diffusion behaviors were significantly improved. Furthermore, the SARs of the ZSM-5 precursors had a remarkable influence on the adsorption performance of ZSM-5/MCM-41 composites. ZSM-5/MCM-41(130) was the optimum option, and its dynamic adsorption capacity for ethyl acetate (111.30 mg·g−1) was higher than that of the corresponding ZSM-5 zeolites even under statured humidity. Meanwhile, the ratios of dynamic adsorption capacities at humid and dry atmospheres (qs,wet/qs,dry) of ZSM-5/MCM-41(130) for n-hexane, toluene, and ethyl acetate were 84.89%, 61.46%, and 73.81% respectively. The results will provide guidelines for the preparation of hydrophobic adsorbents.

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All data included in this study are available upon request by contacting the corresponding author.

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Acknowledgements

The present study was funded by the National Key Research and Development Program of China (2022YFB3504200) and the National Natural Science Foundation of China (U20A20132 and 52072056). We are particularly grateful to Professor Wanyu Ding for his contribution to the work.

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Xu Yue: methodology, investigation, and writing—original draft. Sheng Wang: supervision, conceptualization, writing (review and editing), and funding acquisition. Shudong Wang: methodology, conceptualization, supervision, reviewing, and editing. Wanyu Ding: supervision, conceptualization, and funding acquisition.

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Correspondence to Sheng Wang.

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Responsible Editor: Tito Roberto Cadaval Jr

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Highlights

1. Hierarchically porous ZSM-5/MCM-41 composites were synthesized using ZSM-5 zeolites with different SARs as precursors.

2. The adsorption-desorption behaviors of ZSM-5/MCM-41 composites were investigated using n-hexane, toluene, and ethyl acetate.

3. The hydrophobicity and diffusion behaviors of ZSM-5/MCM-41 composites were improved, compared with ZSM-5.

4. Under humid condition (4 v/v% water), the ZSM-5/MCM-41(130) was the optimum adsorbent for VOC adsorption, and its dynamic adsorption capacities for ethyl acetate was 111.30 mg·g−1.

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Yue, ., Wang, S., Wang, S. et al. Enhancements on volatile organic compounds (VOCs) adsorption and desorption performance of ZSM-5 by fabricating hierarchical MCM-41. Environ Sci Pollut Res 30, 100907–100919 (2023). https://doi.org/10.1007/s11356-023-29483-9

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  • DOI: https://doi.org/10.1007/s11356-023-29483-9

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