摘要
以聚乙烯吡咯烷酮(PVP)溶胶/钛酸四正丁酯和PVP溶胶/银颗粒为前驱体,以共轴静电纺丝法制备了银填充的TiO2中空纳米纤维.将双组分纤维在200℃下热处理去除乙醇与表面吸附水后,继而在空气气氛中焙烧至600℃,可以得到在内表面上沉积银颗粒的TiO2纳米管,银颗粒的直径为5-40nm,TiO2纳米管的外径150-300nm,管臂厚10-20nm.用红外吸收光谱(IR)、X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)等测试手段对超细纤维进行了表征.中空纤维的直径和管壁可以通过改变电纺参数来调节.与Ag-TiO2纳米纤维、TiO2纳米中空纤维、TiO2纳米纤维及TiO2纳米粉体相比较,Ag颗粒填充的TiO2纳米中空纤维在光分解亚甲基蓝上表现出了更好的光催化性能.
This study investigated the coaxial electrospinning process of silver filling in TiO2 ultrafine hollow fibers using polyvinyl pyrrolidone （PVP） sol/titanium n-butyloxide （Ti（OC4H9）4） and PVP sol/silver nanoparticles as pore-directing agents. The bicomponent fibers were heat treated at 200 ℃ and calcined at 600 ℃. Silver particles having diameters of 5 to 40 nm were deposited on the inner surface of the long hollow TiO2 nanofibers （outer diameter of 150-300 nm） with mesoporous walls （thickness of 10-20 nm）. The morphological structure of the filled ultrafme hollow fibers has been studied by means of infrared （IR） spectrum, X-ray diffraction （XRD）, scanning electron microscopy （SEM）, and transmission electron microscopy （TEM）. The diameters and wall thicknesses of the hollow fibers could be tuned by adjusting the electrospinning parameters. Compared with other nanostructured TiO2 materials, such as mesoporous Ag- TiO2 blending fibers, TiO2 hollow nanofibers, TiO2 nanofibers, and TiO2 powders, the silver filled TiO2 hollow fibers exhibited a higher photocatalytic activity toward the degradation of methylene blue.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2008年第10期1790-1796,共7页
Acta Physico-Chimica Sinica
基金
福建省自然科学基金(D0710009)
福建省高校基金(2007F5032)资助项目
