Preparation Of Nanometer TiO₂Doped By Iron And The Study Of Performance And Application In Textiles

Nano-TiO₂as a photocatalytic material has attractive characteristics such as smallparticle size, large specific surface, strength magnetic, high photocatalytic property, strongability to absorb ultraviolet light, good heat conductivity, long-term stability andnontoxicity. Besides, Nano-TiO₂has been given more and more attention in the fields oftextile. Until now, there are still some weaknesses in the application of nano-TiO₂, such asthe narrow light response range, the poor dispersion in aqueous solution, the poor fastnesswith the textile fabrics and the degradation of fabrics, these limit its application in textiles.Therefore, a series research of nano-TiO₂with doping and modifying is carried out in thispaper to resolve the problems above.Nano-TiO₂with the characteristics of globular structure, good dispersion and graindiameter between60-80nm can be synthesized from the cheap precursor of TiCl4bycontrolling the environment of hydrolysis. This method not only simplified process ofpreparation, saved energy, reduced the cost, but also avoided the particle agglomeration ofTiO₂and improved the function of application. Through the transmission electronmicroscopy analysis, the surface of micro balls which size is60-80nm is suffused with thecrystal grains and its size is10nm. The surface area is increased than a single nano-TiO₂with the combination and it can effectively improve the photo-catalysis performance ofTiO₂.The photocatalytic activities and property of Fe³⁺-doped TiO₂, Sn⁴⁺-doped TiO₂andCu²⁺-doped TiO₂are characterized. Compared with none-doped TiO₂, the spectralabsorption peaks and absorption edge of1%Fe³⁺-doped TiO₂has a redshift at103nm and22nm respectively. Obviously, the improvement of visible light induced photocatalyticactivity is successfully realized using1%Fe³⁺-doped TiO₂. Through the photocatalytic degradation of methyl orange test of activity of nano-TiO₂, it confirms that the nano-TiO₂adding with metal doping can effectively improve the photocatalytic activity.Thephotocatalytic degradation rate of1%Fe³⁺-doped TiO₂increased by34.7%compared withnone-doped TiO₂. Besides, the photocatalytic degradation rate of1%Sn⁴⁺-doped TiO₂increased by37.2%compared with none-doped TiO₂. It was found that different ionsexisted a best value of doping, the optimism concentration are1%Fe³⁺,1%Sn⁴⁺,2%Cu²⁺.The influences on the composition synthesis of TiO₂crystal phase added withdifferent dispersants in TiCl4are investigated in detail. And on the preparation ofnano-TiO₂surface modification improve the nano-TiO₂scattered in the water stability. Thedifferent modifier（SHMP, D5040, TEA） are investigated in TiO₂crystal phase compositioncontrol function. The XRD analysis shows that adding a certain amount of SHMP madecompletely anatase; adding D5040made anatase and rutile mixed type of crystal; addingTEA do no causal effect to the type of crystal also for rutile. The effects on differentmodifier of the stability are investigated in detail. After the modification, the isoelectricpoint of nano-TiO₂has different migration. Research shows that: in the neutral pH range,nano-TiO₂dispersing stability order in aqueous solution is:CDEA>KH-550>D5040>TEA.In this paper, different preparation doping ions and grains of the nano-TiO₂phasecomposition are applied in the finishing textiles, which is the most common way in theapplication step. Researches on antibacteria, antiultraviolet light and the degradation offormaldehyde are discussed. The test result confirms that cotton fabrics have multipleadditional functions after finishing by nano-TiO₂.