水热反应温度对PMMA/TiO_2复合纳米纤维膜的形貌和性能的影响

利用静电纺丝技术成功制备了聚甲基丙烯酸甲酯/钛酸四正丁酯(PMMA/TBT)复合纳米纤维膜,通过水热法处理得到了PMMA/TiO_2柔性复合纳米纤维膜。通过傅立叶红外光谱(FTIR)、热失重分析法(TGA)、X射线衍射法(XRD)等手段对PMMA/TiO_2复合纳米纤维膜进行了表征,借助扫描电子显微镜(SEM)、全自动比表面积及孔隙分析仪(BET)对该材料的形貌结构、孔隙结构进行分析,最后探讨了所制备的纳米纤维膜的光催化降解能力,综合分析了反应温度对水热法制备PMMA/TiO_2复合纳米纤维膜的形貌、结构及性能的影响。结果表明:水热反应温度为200℃时,得到的PMMA/TiO_2复合纳米纤维膜中TiO_2晶型为纯锐钛矿型,且晶体生长速率较快,比表面积较大,对污染物亚甲基蓝的脱色效率最高,可达98.93%。

Effect of Hydrothermal Temperature on Morphology and Properties of PMMA/TiO2 Composite Nanofibers Membranes

Poly methyl methacrylate/tetra-n-butyl (PMMA/TBT) composite ultrafine fibrous membrane was prepared by electrospinning technology and hydrothermal treatment.Fourier transform infrared spectroscopy (FTIR),thermal gravimetric analysis (TGA),X-ray diffraction (XRD) were employed to characterize the PMMA/TiO2 composite nanofibrous membranes.Scanning electron microscopy (SEM),automatic specific surface area and pore analyzer (BET) were utilized to analyze the surface morphology and pore structure of the PMMA/TiO2 composite nanofibrous membrane.Finally,the photocatalytic degradability of the as-prepared material was also evaluated.Results show that the PMMA/TiO2 composite nanofibrous membrane with large specific surface area and high catalytic activity can be successfully prepared by the electrospinning.Furthermore,TiO2crystal type of the resulting PMMA/TiO2 composite nanofibrous membranes from the hydrothermal process is pure anatase type when the temperature reaches 200℃.Besides,the specific surface area of the nanofibers membranes is relatively large.And the decolorization ratio toward the model pollutant methylene blue could reach 98.93％.