Preparation、modification And Photocatalytic Performance Research Of Ti O2 Nanofibers With Special Morphology

In recent years, many studies have focused on degradation of organic pollutants by Ti O2 nanomaterials because of their non-toxic,cheap,good chemical stability and high photocatalytic activity. As one kind of Ti O2 nanomaterials, Ti O2 nanofibers have greater surface area, higher porosity and greater adsorption capacity in contrast with Ti O2 nanoparticles. However, the band gap of Ti O2 nanofibers is about 3.2e V, which can only respond to UV light and can not take advantage of the visible light. So, changing the morphology of Ti O2 nanofibers and improving its photocatalytic activity under visible light irradation is the focus of this study.The main contents are described as follows:1.TiO2 nanofibers with special morphology were fabricated by using high pressure electrospinning technique and concentrated alkaline hydrothermal method. The temperatures of being able to produce special morphology Ti O2 nanofibers were investigated. The result showed that hydrothermal temperature higher than 100℃ can produce special morphology. When the calcination temperature is 500 ℃, the special morphology Ti O2 nanofibers exhibit the best photocatalytic activity by degradation rhodamine B under UV irradiation.2.Different x values Znx Cd1-x S solid solution loaded on the special morphology Ti O2 nanofibers were fabricated by 160 ℃ hydrothermal for 24 hours.The as-prepared samples were characterized by SEM,BET,XRD,UV-Vis DRS and XRF.The photocatalytic performance test results showed that Zn0.4Cd0.6S-Ti O2 has the best photocatalytic activity under visible light,the degradation rate of rhodamine B reached82.0% after 1 hour.3. The g-C3N4-TiO2 composites were fabricated by mixed melamine and special morphology Ti O2 nanofibers then calcined use different time,photocatalytic performance test results showed that when calcination time is 6 hours, g-C3N4-Ti O2 composites exhibit the best photocatalytic activity.