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In this study, a spray drying system was used to prepare macroporous titania micro-particles for applications including UV blocking materials and photocatalysts. To synthesize the macroporous particles a colloidal templating method using polymeric beads as sacrificial templates and a titania nano-colloid as precursor material was adopted. The resulting porous titania particles were mixed with distilled water to measure their light transmittance, and to assess their UV blocking performance. To demonstrate another application, the organic dye Rhodamine B was decomposed using the macroporous titania micro-particles as a photocatalyst for water purification. The spray drying system was also utilized to fabricate porous iron oxide particles using iron chloride liquid precursor. Following a reduction reaction, the porous iron oxide particles fabricated in this study are also potentially applicable as intermediates for the synthesis of porous metal particles, which have various applications including porous surface burners, artificial bones, thermal insulation, and sound absorbers. †(Received June 28, 2016; Accepted September 21, 2016)

Fabrication of Porous Titania Particles from Complex Fluids by Spray Drying Process and Their Applications