Preparation Of TiO₂ Accidented Film Coated On Glass Spring And Degradation Research Of Dyeing Wastewater

Recently, dyeing wastewater has become one of the most important contaminators in water ecosystem alone with the development of the dye-spin industry and the increase of the variety and quantity of the dyes. Dyeing wastewater, discharged directly, endangered the subsistence of the hydrobiology and deteriorated the quality of soil.Nowadays, many research focused on the degradation of dyeing wastewater using coated-catalysts by UV irradiation. In previos work, quartz sand and glass beads as carriers were filled in the reactor. However, they usually obstructed the UV's distribution uniformity which lead to lower UV efficiency. For enhancing the activity of the catalysts, researchers paid more attention to doping transition metal ions and depositing of the noble metal in catalysts, but few to the modification of the surface morphologies of coated-catalysts.In this thesis, we chose glass springs as carriers to prepare the accidented TiO₂ film as catalysts. In a typical process, the springs were immerged in the suspend liquid prepared by the mixing of the Ti(OH)₄ nanoparticles and TiO₂ sol whose ratio of quality to volume was 1.6:1(g/L), then drew out with the velocity of 0.5mm/s. After repeating the step above four times and calcining the precursor in 500 °C, we...