Authors: E.W. Tate, J.H. Johnston
Affilation: Victoria University of Wellington, New Zealand, New Zealand
Pages: 514 - 517
Keywords: nanocomposite, silver halide, nanoparticles, calcium silicate, kraft paper
Recently it has been shown that hybrid silver/silver halide nanoparticles exhibit interesting photocatalytic properties, and are known plasmonic photocatalysts. Enhanced photostability and photocatalysis are observed in the nanoparticles due to the surface plasmon resonance of noble metal nanodomains on the surface of the silver halide. Novel silver/silver halide nanocomposite materials were produced by forming silver/silver halide nanoparticles in the porous support materials of kraft paper fibres and nano-structured calcium silicate, by developing a simple aqueous synthesis method followed by UV light exposure. This method incorporated silver/silver halide nanoparticles without modifying the structure of the support material. UV/Visible spectroscopy, XRD, SEM and EDS were used to characterise the silver/silver halide nanoparticles and their distribution within the nanocomposites. The photocatalytic activity of silver/silver halide nanoparticles and nanocomposites was evaluated by the photodegradation of methylene blue. The nanocomposite materials were also shown to retain the enhanced photocatalytic activity displayed by silver/silver halide plasmonic photocatalysts. The nanocomposite materials were also seen to display significant antimicrobial action against E. Coli. These novel composite materials have applications in air and water filtration devices, where the photocatalytic mechanism is effective in the reduction of organic contaminants and volatile organic compounds, whilst Ag+ simultaneously imparts antimicrobial action.