## 4 Conclusions and Future Directions
Combining ZCAF filters with other CO\({}_{2}\) capture technologies, such as membrane separation or cryogenic processes, could lead to hybrid systems that maximize capture efficiency while minimizing energy consumption and operational costs. The development and deployment of ZIF-8 functionalized cellulose air filters (ZCAFs) offer a promising solution for sustainable CO\({}_{2}\) capture. However, it is critical to consider the environmental impact associated with the production and use of these materials. The synthesis of ZIF-8 involves energy-intensive processes and the use of chemical precursors, which could contribute to the overall carbon footprint of the material. Nevertheless, the long-term environmental benefits of using ZIF-8 for CO\({}_{2}\) capture--such as reducing greenhouse gas emissions--are likely to outweigh the initial environmental costs. To further minimize the environmental impact, future studies should explore the use of greener synthesis methods, such as solvent-free or microwave-assisted processes, and the potential for recycling ZIF-8 materials after their use in CO\({}_{2}\) capture. Additionally, a life cycle assessment (LCA) could be conducted to provide a comprehensive understanding of the environmental footprint of ZCAF filters from production to end-of-life disposal. The economic feasibility of scaling up ZCAF production for industrial CO\({}_{2}\) capture applications is another critical consideration. While the synthesis of ZIF-8 and its integration into cellulose matrices may involve higher initial costs compared with traditional CO\({}_{2}\) capture materials, the enhanced efficiency and potentially lower operational costs could make ZCAF filters economically competitive in the long run. Furthermore, the ability to tailor ZIF-8 content and particle size offers the possibility of optimizing the material for specific applications, potentially reducing the cost per unit of CO\({}_{2}\) captured. An economic analysis, including a cost-benefit assessment, would be beneficial to determine the viability of large-scale production and deployment of ZCAF filters. This analysis should consider not only the costs of raw materials and synthesis but also the potential savings in operational expenses and the economic value of reducing CO\({}_{2}\) emissions. These conclusions and future directions offer a roadmap for further research and development, potentially leading to the creation of highly efficient, sustainable, and economically viable CO\({}_{2}\) capture materials. Conceptualization, A.V. ; methodology, A.V., A.S. ([PERSON]) and A.S. ([PERSON]); software, A.V. ; validation, A.S. ([PERSON]), A.S. ([PERSON]) and A.V. ; formal analysis, A.V., A.S. ([PERSON]) and A.S. ([PERSON]); investigation, A.V., A.S. ([PERSON]) and A.S. ([PERSON]); resources, A.V. and M.W. ; data curation, A.V., A.S. ([PERSON]) and A.S. ([PERSON]); writing--original draft preparation, A.V., A.S. ([PERSON]), A.S. ([PERSON]) and K.K. ; writing--review and editing, M.W. and A.V. ; visualization, A.V. ; supervision, A.V. and M.W. ; project administration, A.V. and M.W. ; funding acquisition, A.V. and M.W. All authors have read and agreed to the published version of the manuscript. **Funding:** This project has received funding from the European Union's Horizon 2020 research and innovation Programme under the Marie Sklodowska-Curie Grant Agreement No. 847639, PASIFIC Postdoctoral Fellowship Programme. The content of this article does not reflect the official opinion of the European Union. Responsibility for the information and views expressed herein lies entirely with the authors. **Institutional Review Board Statement:** Not applicable. **Informed Consent Statement:** Not applicable. **Data Availability Statement:** The original contributions presented in the study are included in the article, further inquiries can be directed to the corresponding author. **Acknowledgments:** The authors acknowledge the support of the PASFIC team for administrative support. **Conflicts of Interest:** The authors declare no conflicts of interest.