Preparation And Properties Of Mesoporous TiO₂ Photocatalyst By Soft Template Method

In recent years, mesoporous TiO₂ which has unique characteristics of specific surface area and thermal stability provided a wide range of applications in photocatalysis, photoelectric conversion, sensor and anti-UV.In this research, mesoporous TiO₂ were prepared by using tetrabutyl titanate as the titanium precursor, phytic acid and ionic liquid [Hmim][PF6] as templates and sol-gel method. The performance from different template dosage, calcination temperature and calcination time was studied. On the basis of this, the C-TiO₂ nano-composite photocatalyst was synthesized by one step method with the template itself as the carbon source. The structure properties of the samples were characterized by XRD, BET, EDS, UV-VIS, PL, SEM, TEM, and photocatalytic activity of samples was detected by degradation of Reactive Brilliant Blue KN-R. the concludes as follows:1.Phytic acid template and ionic liquid template both contribute to the synthesis of TiO₂ photocatalyst. The sample whose size was relatively uniform, and surface area increased significantly, is a kind of anatase phase nano-composite materials. The optimum synthesis conditions of the samples were as follows: template dosage ratio 6%, calcination temperature 500 ℃, calcination time 2 h. The photocatalytic degradation rate under UV light was 91.02% and 85.26%, respectively.2.The anatase phase nano-composite C-TiO₂ photocatalyst with large specific surface area was prepared by using phytic acid template and ionic liquid template as the carbon source. The research shows that the introduction of C makes the sample structural performances, specific surface area and light absorption property were improved, and the sunlight photocatalytic degradation rate reached 88.43% and 96.08% respectively. Meanwhile, the performance of C-TiO₂ photocatalyst prepared by ionic liquid template is better.