ZnO Polymeric Composite Films for n-Decane Removal from Air Streams in a Continuous Flow NETmix Photoreactor under...

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Polymeric composite films are utilized in photocatalysis for water treatment and self-cleaning.
• Film properties like thickness and porosity are crucial but often underexplored, especially for gas-phase applications.
• Understanding preparation effects on ZnO-based films is key for optimizing photocatalytic performance.

Purpose of the Study:

• To investigate the impact of preparation treatments on ZnO-based polymeric composite films for gas-phase photocatalysis.
• To evaluate how film thickness, porosity, and component ratios affect photocatalytic efficiency and stability.
• To identify the causes of deactivation in these composite films.

Main Methods:

• Preparation of poly(vinylidene fluoride) (PVDF) and ZnO composite films using solution mixing and non-solvent induced phase separation (NIPS).
• Systematic variation of wet thickness, ZnO photocatalyst mass, and use of pore-forming agents and compatibilizers.
• Characterization using X-ray Diffraction (XRD), Fourier-Transform Infrared Attenuated Total Reflectance (FTIR-ATR), and Scanning Electron Microscopy (SEM).

Main Results:

• A low ZnO/PVDF ratio and increased wet thickness, combined with pore-forming agents and compatibilizers, enhanced photocatalytic efficiency.
• These optimized conditions led to reduced ZnO agglomeration and improved polymer transmittance.
• The composite films showed deactivation within minutes, attributed to zinc carbonate formation.

Conclusions:

• Optimized preparation strategies can enhance the photocatalytic efficiency of ZnO-based polymeric composites.
• Film stability remains a challenge, with zinc carbonate formation being a primary deactivation pathway.
• Further research is needed to improve the long-term stability of these materials for practical applications.