Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, No. 422, Southern Siming Road, Xiamen 361005, PR China.
Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, No. 422, Southern Siming Road, Xiamen 361005, PR China; College of Food and Biological Engineering, Jimei University, Xiamen 361021, PR China.
Ecotoxicol Environ Saf. 2021 Mar 1;210:111866. doi: 10.1016/j.ecoenv.2020.111866. Epub 2020 Dec 30.
A novel composite electrospun fiber with high photocatalytic efficiency, good stability, strong hydrophobicity, good pollution resistance, and easy separation and recovery was synthesized. The TiO@g-CN (TCN) with special core-shell structure (5-10 nm shell) facilitated the separation of photogenerated electron-holes and had high photocatalytic performance. The poly (vinylidene fluoride) (PVDF) electrospun fiber immobilized with TCN was successfully fabricated (PVDF-TCN) with uniform distribution and size of nanofibers by using electrospinning, which was used for degrading tetracycline under visible-light irradiation (> 400 nm). A special rougher surface of electrospun fiber obtained by washing of sacrificial PVP increased the specific surface area, which became more conducive to the adhesion of the catalyst. The water contact angle and FTIR results demonstrated that the electrospun fiber became extremely hydrophilic after adding TCN catalyst, which could effectively mitigate the fiber pollution. The PVDF-TCN-0.2g electrospun fiber exhibited excellent photocatalytic performance and the degradation efficiency of tetracycline was up to 97% in 300 min under visible-light irradiation. The mechanism of PVDF-TCN electrospun fiber degradation of tetracycline in the photocatalytic process was also proposed. In addition, the PVDF-TCN-0.2g exhibited a stable activity after 4 cycles experiments since the degradation efficiency remained about 90%. Therefore, we believed this study provided a new strategy in catalyst immobilization and wastewater treatment.
一种具有高光催化效率、良好稳定性、强疏水性、良好耐污染性和易于分离回收的新型复合电纺纤维被合成。具有特殊核壳结构（5-10nm 壳层）的 TiO@g-CN（TCN）促进了光生电子-空穴的分离，具有高光催化性能。通过静电纺丝成功制备了聚偏二氟乙烯（PVDF）固定 TCN 的电纺纤维（PVDF-TCN），纳米纤维分布均匀且尺寸均匀，使用电纺丝，在可见光照射下（>400nm）用于降解四环素。通过牺牲性 PVP 的洗涤获得的电纺纤维的特殊粗糙表面增加了比表面积，这更有利于催化剂的附着。水接触角和 FTIR 结果表明，加入 TCN 催化剂后电纺纤维变得极其亲水，可有效减轻纤维污染。在可见光照射下，PVDF-TCN-0.2g 电纺纤维在 300min 内表现出优异的光催化性能，四环素的降解效率高达 97%。还提出了在光催化过程中 PVDF-TCN 电纺纤维降解四环素的机制。此外，PVDF-TCN-0.2g 在 4 次循环实验后表现出稳定的活性，因为降解效率仍保持在 90%左右。因此，我们认为这项研究为催化剂固定化和废水处理提供了一种新策略。
