Development of Photoactive Nano TiO_2 Thin Film-Geopolymer Based on Laterite Soils Deposit Gowa Regency as Self-Cleaning Material

摘要

The main objectives of this study is to investigate the properties of photoactive Nano TiO_2 thin film-geopolymer based on laterite soils deposit Gowa regency as self-cleaning material. The soil was clean, grounded, sieves 200 mesh and dehydroxylated at 750°C for 2 hours. Nano TiO_2 was prepared through ball milling process for 10 hours. The geopolymers was synthesized through alkali activation method by adjusting the molar oxide ratios of SiO_2/(Al_2O_3+Fe_2O_3), Na_2O/SiO_2 and H_2O/Na_2O in accordance with the chemical compositions of the soils. Nano TiO_2 was added into geopolymers paste at different concentration namely 0.5% and 1.0% (relative to the mass of laterite soils) by using spray method. The self-cleaning properties of the sample were observed by immersing the sample into clays solution then irradiated under UV lamp for 24 hours. The X-Ray Diffraction (XRD) was performed to examine the structure and phase of the sample. The surface morphology of geopolymers was studied by using scanning electron microscopy (SEM). The measurements results showed that photoactive Nano Ti02-geopolymers composite can be applied as self-cleaning materials.