负载高催化活性TiO_2纳米管涤纶纤维的制备及其对甲醛降解的研究

Preparation of TiO_2-NT Coated PET Fabrics and Their Formaldehyde Degrading Effect

为提高室内装饰织物对甲醛的催化降解能力,采用水热合成法制备了内径为5-7 nm,外径为10 nm左右,长度在数百纳米两端开口的TiO2纳米管（TiO2-NT）,同时将TiO2-NT负载到碱减量处理的涤纶纤维上制得了催化纤维（TiO2-NT/PET）。采用TEM、SEM、EDS、XRD对TiO2-NT进行了表征,同时考察了在紫外光照射下TiO2-NT/PET对有害气体甲醛的光催化降解能力。结果表明,TiO2（P25）经水热反应后由原来的锐钛矿和金红石混晶转变为无定型,经盐酸清洗和400℃煅烧后转变为单一的锐钛矿TiO2-NT;制得的TiO2-NT光催化活性较反应前提高了2倍以上。将这种高催化活性TiO2-NT负载于经碱减量处理的涤纶纤维制得的催化纤维对甲醛气体有明显的催化降解效果。

TiO2-NT, with an external diameter of 10 nm, an inner diameter of 5-7nm and a length of hundreds of nanometer, is prepared by hydrothermal synthesis. It is characterized by TEM, SEM,EDS and XRD. Meanwhile, TiO2-NT/PET nanocomposite fiber is obtained by supporting TiO2-NT onto alkalitreated PET fibers and its photocatalytic activity for degrading noxious formaldehyde is investigated. The results shows that the phase structure of TiO2-NT with mixture of anatase and rutile is converted into amorphous one after hydrothermal treatment and into single anatase after being washed by acid and calcination at 400℃. The photocatalytic activity of the calcined nanotubes exceed that of TiO2 by a factor more than 2.0 times. TiO2-NT/PET also shows good effect on degrading formaldehyde and this shows a new solution to enhance catalytic degradation performance of textile on removing formaldehyde.