TiO_2纳米纤维的制备及其对染料的光催化降解性能

Preparation and photocatalytic degradation properties on dyes of TiO_2 nanofibers

采用溶胶-凝胶与静电纺丝技术相结合的方法,将聚乙烯吡咯烷酮(PVP)和钛酸四正丁酯混合制得前驱体溶液,纺丝得PVP/TiO2复合纳米纤维,然后经500℃高温煅烧制备了TiO2纳米纤维光催化剂,通过其对阳离子艳红5GN、弱酸性黄GN、雷马素蓝RR等染料的降解研究了TiO2纳米纤维的光催化性能。利用扫描电子显微镜(SEM)观察了PVP/TiO2和TiO2纳米纤维的形貌结构;傅里叶变换红外光谱(FT-IR)证实了TiO2纳米纤维的形成;通过X射线衍射仪(XRD)对TiO2纳米纤维的晶型及晶粒大小进行了分析。结果表明制备出的TiO2纳米纤维形貌稳定,具有锐钛矿型TiO2结晶形态并对染料具有很好的光催化降解效果。

Combined with sol gel technique and electrospinning methods, the electrospun precursor solution was prepared through mixing the PVP and tetrabutyl titanate; and then PVP/TiO2 composite nanofibers were pre- pared by electrospinning. The TiO2 nanofibers as photo catalyzer were prepared by calcinating PVP/TiO2 com- posite nanofibers at 500℃. The photocatalytic degradation properties of TiO2 nanofibers were studied through taking different kinds of dyes （cationic brilliant red 5GN, weak acid yellow GN, remazol blue RR） as organic pollutant model. The structural morphology of the PVP/TiO2 and TiO2 nanofibers was characterized by SEM. The composition and crystal structure of TiO2 nanofibers were analyzed by FT-IR spectra and XRD. The exper- imental results indicated that TiO2 nanofibers processed desired morphology, anatase-TiO2 crystal structure and good photocatalytic degradation properties on different dyes.