Gas chromatographic study of isoamyl acetate and its photo-catalyzed product obtained from the activity of Ag/TiO2/BC composite

S. Pookboonmee, K. Laohhasurayotin
National Nanotechnology Center, National Science and Technology Development Agency, TH

Keywords: composite materials, adsorption, odor control, gas chromatography

Summary:

Prior work by our laboratory [1] was the report stating that silver (Ag), titanium dioxide (TiO2), and bamboo charcoal (BC) could be combined into a composite where all three components performed their inherited properties including antibacterial, photocatalysis, and adsorption. In this work, to investigate the capability of this composite for more specific application such as malodor treatment, the vapor of a unique source, i.e. isoamyl acetate as banana-like odor, which can be a stench at high concentration for some individuals, was chosen for the adsorption determination. Gas chromatographic (GC) method was used throughout this experiment for analyzing the efficiency of the Ag/TiO2/BC composite comparatively with other materials, e.g. pure BC or TiO2/BC. Vapor of isoamyl acetate was allowed to be adsorbed on the materials for a certain time after which the residue was collected through the solid-phase microextraction method (SPME) and further analyzed by GC with a mass spectrometer (MS). The study confirmed that Ag/TiO2/BC possesses functionality to remove isoamyl acetate vapor by adsorption. Moreover, 3-methyl butanol as a new product after adsorption observed in GC-MS data indicated the occurrence of visible light photocatalytic reaction.