College of Food Science, Sichuan Agricultural University, Yaan 625014, China.
College of Mechanical and Electrical Engineering, Sichuan Agricultural University, Yaan 625014, China.
Ultrason Sonochem. 2021 Jan;70:105343. doi: 10.1016/j.ultsonch.2020.105343. Epub 2020 Sep 10.
Polyacrylonitrile (PAN)/β-cyclodextrin (β-CD) composite nanofibrous membranes immobilized with nano-titanium dioxide (TiO) and graphene oxide (GO) were prepared by electrospinning and ultrasonic-assisted electrospinning. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM), and X-ray diffraction (XRD) confirmed that TiO and GO were more evenly dispersed on the surface and inside of the nanofibers after 45 min of ultrasonic treatment. Adding TiO and GO reduced the fiber diameter; the minimum fiber diameter was 84.66 ± 40.58 nm when the mass ratio of TiO-to-GO was 8:2 (PAN/β-CD nanofibrous membranes was 191.10 ± 45.66 nm). Using the anionic dye methyl orange (MO) and the cationic dye methylene blue (MB) as pollutant models, the photocatalytic activity of the nanofibrous membrane under natural sunlight was evaluated. It was found that PAN/β-CD/TiO/GO composite nanofibrous membrane with an 8:2 mass ratio of TiO-to-GO exhibited the best degradation efficiency for the dyes. The degradation efficiency for MB and MO were 93.52 ± 1.83% and 90.92 ± 1.52%, respectively. Meanwhile, the PAN/β-CD/TiO/GO composite nanofibrous membrane also displayed good antibacterial properties and the degradation efficiency for MB and MO remained above 80% after 3 cycles. In general, the PAN/β-CD/TiO/GO nanofibrous membrane is eco-friendly, reusable, and has great potential for the removal of dyes from industrial wastewaters.
聚丙烯腈（PAN）/β-环糊精（β-CD）复合纳米纤维膜通过静电纺丝和超声辅助静电纺丝制备，固定有纳米二氧化钛（TiO）和氧化石墨烯（GO）。扫描电子显微镜（SEM）、能量色散光谱（EDS）、透射电子显微镜（TEM）和 X 射线衍射（XRD）证实，经过 45 分钟的超声处理后，TiO 和 GO 更均匀地分散在纳米纤维的表面和内部。添加 TiO 和 GO 降低了纤维直径；当 TiO 与 GO 的质量比为 8:2 时，纤维直径最小为 84.66±40.58nm（PAN/β-CD 纳米纤维膜为 191.10±45.66nm）。使用阴离子染料甲基橙（MO）和阳离子染料亚甲基蓝（MB）作为污染物模型，评估了纳米纤维膜在自然光下的光催化活性。结果表明，当 TiO 与 GO 的质量比为 8:2 时，PAN/β-CD/TiO/GO 复合纳米纤维膜对染料的降解效率最高。MB 和 MO 的降解效率分别为 93.52±1.83%和 90.92±1.52%。同时，PAN/β-CD/TiO/GO 复合纳米纤维膜还具有良好的抗菌性能，MB 和 MO 的降解效率在 3 次循环后仍保持在 80%以上。总的来说，PAN/β-CD/TiO/GO 纳米纤维膜具有环保、可重复使用的特点，在去除工业废水中的染料方面具有很大的潜力。
