چكيده به لاتين
The process of industrialization of societies in the last century has caused many problems such as water and air pollution and the emergence of substances that can resist biological decomposition. Among the various methods, the photocatalytic oxidation (PCO) method has been widely considered in the destruction of environmental pollution. Titanium nanoparticles have been studied a lot in recent years due to their suitable activation energy and the ability to form hydroxyl radical (•OH), which is the cause of organic compound degradation. In this research, the surface modification of titanium nanoparticles was done in order to make titanium nanoparticles compatible with the acrylic polymer phase of water base and to improve the photocatalytic properties. To modify the surface of titanium nanoparticles, two types of silane-amine linking compounds (bis-triethoxysilylpropylamine (BTESPA) and triaminopropyltriethoxysilane (APTES)) were used in different concentrations (1, 3, 5, and 7 times stoichiometric). Infrared spectroscopy (FTIR), thermogravimetry (TGA), Zeta-potential, X-ray diffraction (XRD) and contact angle analyzes were used to analyze the structure of nanoparticles. The results showed that the highest degree of grafting of both silanes (BTESPA and APTES) was achieved at 5 times stoichiometric silane concentration (ie, 10% and 6%, respectively). Also, in order to investigate the mechanical and photocatalytic properties of pseudo-color samples, tensile test, colorimetry and visible-ultraviolet spectroscopy (UV-Vis) were used. The results showed that silanization of nanoparticles with BTESPA and APTES increased the tensile strength by 47% and 51%, respectively, compared to pseudo-color films containing pure nanoparticles. In addition, modification of the surface of titanium nanoparticles with silane BTESPA and APTES causes a 35 and 27% increase in the photocatalytic properties of nanoparticles under visible light irradiation.
