Synthesis of Titanium (Iv) Oxide and Prospects of Its Application in Adsorption and Photocatalytic Water Treatment Processes

Abstract

Pure titanium oxide (TiO2(ng)) and modified with potassium fluoride with different percentage of dopant: 2, 7, 15% (TiO2(2F), TiO2(7F), TiO2(15F), respectively) samples were synthesized by low-temperature sol-gel method. The morphology and particle size of pure titanium(IV) oxide (TiO2(ng)) and titanium(IV) oxide doped with potassium fluoride (TiO2(2F)) were investigated by scanning electron microscopy method. It was found that the doping with potassium fluoride does not have a significant effect on the shape of the particles, but allows to narrow the particle size distribution. X-ray phase and X-ray structural analyzes of the obtained TiO2 samples showed that the predominant phases of pure TiO2 were rutile and brookite, and only anatase contained in TiO2 doped with KF. The porous structure of the synthesized TiO2 samples was studied by the method of low-temperature nitrogen adsorption-desorption. It was found that the all obtained TiO2 samples belonged to porous adsorbents, the adsorption of which carried out monolayer. The adsorption properties of the obtained TiO2 samples were investigated using a model pollutant, phenol. It was found that the best adsorption properties showed TiO2(2F) sample at all three concentrations of pollutant. The maximum adsorption degree of phenol with an initial concentration of 3.125 mg/dm3 (18%) was achieved by TiO2(2F) sample; with an initial phenol concentration of 6.25 mg/dm3 was 21.5%, and at an initial phenol concentration of 12.5 mg/dm3 it was 42%. The highest photocatatical activity was shown by the sample of low-doped fluorine TiO2, in the presence of which phenol was decomposed by 68%.