Hot-Pressed Reinforced Photocatalyzed TiO2/Chitosan/SiO2 Nanofibers

TL;DR

This paper presents a new method to create strong, self-cleaning membranes using hot-pressed TiO2/chitosan/SiO2 nanofibers with improved mechanical and photocatalytic properties.

Contribution

The novel hot-pressing technique enhances adhesion, dispersion, and uniformity of TiO2/chitosan coatings on SiO2 nanofibers.

Findings

Hot-pressing increased the diameter of SiO2 nanofibers by approximately 35.4%.

The 3 wt% TiO2-chitosan coating achieved a fracture stress five times higher than untreated fibers.

Photocatalytic efficiency improved by 36% under UV light exposure.

Abstract

This study introduces a novel fabrication method for high-strength, self-cleaning photocatalytic membranes through the integration of hot-pressing and TiO2/chitosan/SiO2 nanofibers. The innovation of this research lies in the hot-pressing technique, which significantly enhances the mechanical properties and photocatalytic efficiency by improving the adhesion, dispersion, and uniformity of the TiO2/chitosan coating on SiO2 nanofibers. SiO2 nanofibers with an initial diameter of 0.79 ± 0.29 μm were coated and hot-pressed, resulting in a final diameter of 1.07 ± 0.57 μm, which corresponds to an approximate increase of 35.4%. In addition, the 1 wt% TiO2-CTS sample showed the highest adhesion and surface energy, with values of 0.1 nN/nm2, indicating the closest intermolecular binding. 3 wt% SiO2-CTS exhibits a maximum hardness of 5.23 Pa. The 3 wt% TiO2-chitosan coating demonstrated outstanding mechanical performance, achieving a fracture stress of 0.53 MPa, approximately five times that of the untreated SiO2 nanofibers, a Young’s modulus of 0.63 MPa, and a toughness to triple of 0.27 MJ/m3—representing substantial improvements over uncoated membranes. Photocatalytic efficiency was significantly enhanced, with grayscale values increasing approximately 36% UV light exposure, indicating the superior degradation of pollutants.

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