PPS/TiO_(2)复合纤维膜的制备及其对亚甲基蓝染料的降解

Preparation of PPS/TiO_(2) composite fiber membrane and its degradation of methylene blue dye

针对光催化剂二氧化钛(TiO_(2))的载体材料不稳定问题,以聚乙烯醇(PVA)为牺牲模板,采用静电纺丝法制备了聚苯硫醚(PPS)/PVA/TiO_(2)初生复合纤维膜,之后经过烧结得到具有光催化功能的PPS/TiO_(2)复合纤维膜,并对亚甲基蓝染料进行光催化降解实验;通过形貌观察以及孔径、孔隙率和光催化性能等测试,分析TiO_(2)的加入对纤维膜结构和性能的影响。结果表明:加入TiO_(2)纳米粒子后,PPS纤维变的不均匀,出现了节结结构;复合纤维膜的孔径从0.73μm增大到1.08μm,孔隙率从83%减少到80%;光催化降解亚甲基蓝(MB)染料实验中,PPS/TiO_(2)复合纤维膜可以在紫外灯下催化降解75%的MB染料,并在紫外灯下光照5 h后依然表现出良好的结构稳定性。

In view of the instability of the carrier material of the photocatalyst titanium dioxide(TiO_(2)), polyvinyl alcohol(PVA) was used as a sacrificial template to prepare polyphenylene sulfide(PPS)/PVA/TiO_(2)primary composite fiber membranes by electrospinning. After sintering, a PPS/TiO_(2)composite fiber membrane with photocatalytic function was obtained, and photocatalytic degradation of methylene blue(MB) dye was studied. Through morphology observation, pore size, porosity and photocatalytic performance tests, the influence of the addition of TiO_(2)on the structure and performance of the fiber membrane was analyzed. The results showed that after adding TiO_(2)nanoparticles, the PPS fibers became uneven and nodular structure appeared;the pore size of the composite fiber membrane increased from 0.73 μm to 1.08 μm, and the porosity decreased from 83% to 80%;in the experiment of photocatalytic degradation of MB dye, the PPS/TiO_(2)composite fiber membrane can catalytically degrade75% of MB dye under ultraviolet light, and still exhibits good structural stability after 5 h exposure under ultraviolet light.