Novel chitosan-TiO₂ nanohybrid: Preparation, characterization, antibacterial, and photocatalytic properties

Abstract

In this report, chitosan (CS) encapsulated titanium dioxide (TiO2) nanohybrid was prepared by chemical precipitation method. Fourier transform infrared spectroscopy (FT‐IR) and X‐ray diffraction (XRD) confirmed the formation of nanohybrid. Transmission electron microscopy (TEM) analysis showed the immobilization of TiO2 nanoparticles on the surface of CS. The nanohybrid was also characterized by thermogravimetric analysis (TGA) and zeta potential. The nanohybrid exhibited high photocatalytic activity as evident from the degradation of methylene blue (MB) dye. The result revealed substantial degradation of the MB dye (90%) under UV‐light illumination. The catalytic efficiency was unaltered even after five cycles of reuse. In addition, the nanohybrid exhibited a superior antibacterial activity of 100% within 24 h of treatment against Escherichia coli (E. coli) was measured by colony forming units (CFU). POLYM. COMPOS., 35:327–333, 2014. © 2013 Society of Plastics Engineers

Antibacterial properties and toxicity from metallic nanomaterials

“…Bacteria is also killed by high ROS produced by the photocatalytic process of TiO 2 , such as hydroxyl radical, superoxide, or hydrogen peroxide. 120 As a photocatalyst, titanium dioxide both oxidizes organic contaminants and damages microbial cells. Significant antibacterial performances are light activated from the nanomaterial of TiO 2 nanoparticle-based film.…”

Enhanced Stability of Α-Amylase via Immobilization onto Chitosan-Tio2 Nanocomposite

“…The major weight loss was observed in second step between 250 and 500°C. It was reported that this weight loss was caused by decomposition of the polysaccharide and loss of (O-H) groups of TiO 2 dispersed in polymer matrices [37]. After 500°C there is no significant weight loss was observed.…”

Influence of chitosan–PEG binary template on the crystallite characteristics of sol–gel synthesized mesoporous nano-titania photocatalyst

“…1a-c respectively. TGA thermogram of PEG-titania showed the decomposition of PEG from 250 to 380 • C. The weight loss between 260 and 480 • C in the chitosantitania was attributed to the degradation of chitosan [21]. In P1-C3 titania, the initial weight loss from 50 to 250 • C was due to moisture vaporization and loss of other volatile species such as isopropanol and acetic acid [22].…”