Research On The Preparation, Composite And Photocatalytic Properties Of TiO₂ Fiber

Nano-titanium dioxide with the superiority of non-toxic, high catalytic activity, strongoxidizability and chemical stability, stands out in many semiconductor photocatalysts andmoreover is the core status in the research of photocatalysis. The tetrabutyl titanate, titaniumsulfate and metallic titanium was used as Ti resource to prepare the TiO₂fiber with thehydrothermal method and meanwhile combined sol-gel method and hydrothermalprecipitation method in order to solve the problem that not only TiO₂ powder is agglomerationeasily and separate, recycle difficultly, but also thin-film and laden TiO₂ photic catalyzer havepoor property. The new photocatalyst, which was a kind of function materials with broadapplication and development, not only had strong catalytic activity and toughness, but alsoseparated and recycled easily. XRD, Raman, SEM, TEM and some other characterizingmethods were used to characterize production. Methyl orange waste water was used asdegradation agent to evaluate the photocatalytic activity of self prepared fiber and was relatedwith structure and morphology of production effectively. At the same time the main factors toeffect photo catalytic activity were discussed. The main content was the following four parts:1. The tetrabutyl titanate was used as Ti resource to prepare the TiO₂ fiber mixed Fe withthe sol-gel method and hydrothermal method successfully. The optimum technologicalcondition: the tetrabutyl titanate was used as precursor to prepare Fe³⁺/TiO₂powder withsol-gel method. The Fe³⁺/TiO₂powder was calcined at 600℃and then with high-pressurehydrothermal activation 72h in 12 mol/L, 160℃alkaline solution to prepare anatase Fe3+/TiO₂fiber with diameter 500nm and slenderness ratio 50～60 marked as a.2. The optimum technological condition of TiO₂fiber prepared by hydrothemal methodwas successfully explored firstly with the titanium plate as Ti resource. The optimumtechnological condition was as follows: three pieces of titanium plate 1cm×2cm,concentration of alkali liquor 10 mol/L, reaction time 24h, reaction temperature 180℃, prepared TiO₂fiber with diameter 100nm and slenderness ratio 220 marked as b.3. Titanium sulfate was used as Ti resource and carbamide was used as precipitator whenpreparing TiO₂particle with hydrothermal precipitation method. TiO₂particle was used asprecursor to prepare TiO₂fiber with hydrothemal method in alkali liquor. The best conditionwas the following, prepare TiO₂powder with molar ratio of titanium sulfate and carbamide1:2, reaction temperature 160℃, reaction time 6h and then made it in 10 mol/L alkali liquor72h to produce TiO₂fiber with diameter 500nm and slenderness ratio 70 marked as c.4. The catalytic reaction of TiO₂fiber prepared with different method was carried out.The degradation rate of methyl orange waste water （20mL 6mg/L） 1h later were respectively92% （a）, 83% （b）, 78% （c）, which used 0.01g catalyzer. The degradation rate of catalyzerreused five times were 90% （a）, 81% （b）, 77% （c）. The recovery percent of catalyzer reusedfive times were 98.58% （a）, 99.53% （b）, 99.8% （c）.