在一种新的溶剂体系中通过静电纺丝制备TiO_2纳米纤维  

Fabrication of TiO_2 Nanofibers in a Novel Solvent System Through Electrospinning

作　　者：梁建鹤[1] 杨锦霞[1] 黄应兴[1] 刘海清[1] 

机构地区：[1]福建师范大学化学与材料学院福建省高分子材料重点实验室,福州350007

出　　处：《化学学报》2010年第17期1713-1718,共6页Acta Chimica Sinica

基　　金：国家自然科学基金(Nos.50973019;50843030);国家重点基础研究发展计划("973"项目;2010CB732203);福建省自然科学基金(No.2006J0011)资助项目

摘　　要：以钛酸四丁酯为前驱体,醋酸纤维素为模板纤维,丙酮/N,N-二甲基乙酰胺为溶剂,通过静电纺丝,水解和450℃煅烧制备了直径约为80nm的锐钛矿型TiO2纳米纤维.通过扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)和N2吸脱附法表征了TiO2纳米纤维的形貌、直径大小、晶态、比表面积、孔结构及分布.研究表明该纳米纤维由大小为9.2nm的颗粒组成,纤维内含有大量直径为1.7～21nm的介孔.它具有与直径为25nm的商业化DegussaP25相似的高比表面积,约为50m2/g.研究了TiO2纳米纤维对有机小分子化合物罗丹明B(RhB)和苯酚的光催化降解.结果表明:以6mg/L的RhB和10mg/L的苯酚水溶液为母液,以质量分数为0.05%的TiO2纳米纤维膜为催化剂,在500W的紫外灯照射下,2h内约90%的RhB和75%的苯酚能被光催化降解.Anatase TiO2 nanofibers were synthesized through electrospinning a precursor solution of tetrabutyl titanate in acetone/N,N-dimethylacetamide （DMAc）,using cellulose acetate as the carrying polymer. Anatase TiO2 nanofibers of ca. 80 nm in diameter were obtained after post-electrospinning treatment steps including hydrolysis and calcination at 450 ℃. The morphology and structure of TiO2 nanofibers were characterized by SEM,TEM,XRD and N2 adsorption-desorption techniques. TiO2 nanofibers were composed of grain-like nanoparticles of ca. 9.2 nm in diameter. They showed mesoporous structure with pore size of 1.7～21 nm. The specific surface area of the TiO2 nanofibers was ca. 50 m2/g. This is close to that of commercial Degussa P25. Their photocatalytic decomposition efficiency toward organic molecules such as Rhodamine B （RhB） and phenol was tested under the irradiation of ultraviolet at 365 nm. With the loading of 0.05% （w） TiO2 nanofibrous mats in 6 mg/L RhB and 10 mg/L phenol aq. solutions,about 90% of RhB and 75% of phenol were decomposed,respectively,under 500 W UV light for less than 2 h.

关 键 词：静电纺丝 纳米纤维 二氧化钛 光催化剂 

分 类 号：O614.411[理学—无机化学]