Development of Nano TiO2 Coated Cement Surface Degradation Properties by the Photocatalytic

Abstract

The objectives of this study were l)to investigate the stability of Colloid Nanoparticles by using diffusion aid, 2)to study the TiO2 nanoparticles on the cement surface, and 3)to study the organic degradation behavior on the TiO2 coated cement surface by the Photocatalytic. The study of the stability of the dispersant found that Polyethyleneglycol (PEG) MW 4000 was more effective in dispersing nanoparticles than other materials. The sample size was 5x5x1 centimeters, and cemented to water/cement ratio of 0.4, and hydration cement for 28 days at room temperature. Surface was grinded and sprayed coating of TiO2 nanoparticles on the cement surface with Air Brush. Then, the SEM confirmed it. There were nanoparticles attached to the cement surface and in the porous area of the cement. Methylene blue (MB) concentrations of 0.01, 0.03, and 0.05 mg/L for 3 hours under UV light (in UV box) were measured. The TiO2 nanoparticles could decompose organic matter by the Photocatalytic. The observation of the reduced absorbance of the nano TiO2 coated cement surface was measured with UV-Vis technique. It was ensured that nano TiO2 coated cement surface was able to decompose organic substances and apply them effectively to outside walls or cementitious materials.