10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Tailored Synthesis of Macroporous Pt/WO3 Nanoaggregates via Flame Spray Pyrolysis and Their Photocatalytic Properties
OGI TAKASHI, Ghana Rinaldi Febrigia, Tomoyuki Hirano, Kikuo Okuyama, Department of Chemical Engineering, Hiroshima University
Abstract Number: 306 Working Group: Materials Synthesis
Abstract A high surface area is a key feature of nanoparticles, and enhances their performances in many applications, including photocatalysis. However, handling nanoparticles is more difficult than handling micron- or submicron-sized particles. It has been reported that exposure to large amounts of nanoparticles over a long time period can harm human health and the environment. One strategy for addressing this issue is nanostructuration of micron- and submicron-sized particles, which gives the desirable properties associated with nanoparticles (e.g., high surface area and low density) and improved handling properties. In this research, high-surface-area macroporous WO3 nanoaggregates particles with deposited Pt (Pt/WO3) were successfully synthesized using flame spray pyrolysis. The macroporous structure was tailored by changing the mass ratio of the polystyrene template to ammonium tungstate pentahydrate. The cavities between the nanoaggregates formed mesopores, which increased the surface area. The high surface area resulting from meso- and macro-pores in the synthesized Pt/WO3 particles improved their photocatalytic activities in visible-light-induced photodegradation of rhodamine B. The combination of a high surface area and the presence of an in situ-deposited Pt cocatalyst gave a high photodecomposition rate, approximately 9.6 times higher than that achieved with dense WO3 particles. This research provides a promising strategy for synthesizing submicron particles with high surface areas at a high production rate, and is suitable for industrial applications.