氧化钛纤维膜的电纺合成及光降解性能研究

Synthesis of titania fibers by electrospinning and its photocatalytic degradation properties

以聚乙烯吡咯烷酮为模板剂,钛酸正丁酯为钛源,乙酸为抑制剂,将上述物质溶解于无水乙醇中制备成电纺前驱体溶液,通过静电纺丝技术及后续煅烧处理制备二氧化钛纳米纤维膜。分别通过热重分析法、X射线粉末衍射、扫描电镜和透射电镜对其进行表征和分析,并对影响纤维形貌的纺丝工艺参数进行探索。结果表明:电压1.4×10~4V,纺丝距离0.2 m,平移速度2.5×10^(-3)m·s^(-1),喷射速度3×10^(-4)m·s^(-1),针头内径3×10^(-4)m,可获得形貌良好,粗细均匀,直径约150 nm的纳米二氧化钛纤维。将纤维用于1×10^(-4)mol·L^(-1)亚甲基蓝溶液在紫外光下的光催化降解,在180 min后,降解率达到95.8%。

The electrospinning precursor solution was prepared by dissolving polyvinyl pyrrolidone as template,tetrabutyl titanate as titanium source, and acetic acid as inhibitor. The TiO2 nanofilms were prepared by precursor solution electrospinning and subsequent calcination. Thermal gravimetric analysis（TG）,scanning electron microscopy（SEM）,X-ray powder diffraction（XRD）,and transmission electron microscopy（TEM） were used to characterize and analyze the samples. The influence of technological parameters on spinning fiber morphology was also studied. The results indicate that the TiO_2 nanofibers morphology is good when the parameters are as follows：voltage 1.4×10^4 V,spinning distance 0.2 m,translational velocity 2.5×10^-3 m·s^-1,flow rate 3×10^-4 m·s^-1,and needle diameter 3×10^-4 m. The diameter of the fibers is about 150 nm. With the 1×10^-4 mol·L^-1 methylene blue solution used as simulated degradation target,the degradation rate is 95.8% after 180 minutes.