PVA/GA/β-CD纳米纤维的制备及染料吸附性能

Preparation of PVA/GA/β-CD Nanofibers and Its Adsorption of Dyestuff

利用静电纺丝技术,以六氟异丙醇(HFIP)和水为溶剂,制备了环糊精(β-CD)含量为70%(质量分数)的聚乙烯醇(PVA)/β-CD纳米纤维,并经戊二醛(GA)交联处理得到了可用于染料吸附的PVA/GA/β-CD纳米纤维.通过红外光谱和扫描电子显微镜研究了交联反应前后纳米纤维组成和形貌的变化;考察了PVA/GA/β-CD纳米纤维对7种水溶性染料的吸附性能.结果表明,PVA/GA/β-CD纳米纤维对孔雀石绿、甲基紫和刚果红的吸附效果较好,最大吸附量分别为124.71,121.14和127.39 mg/g,4次吸附-解吸附循环后,染料去除率仍保持80%左右,在染料废水处理中具有良好的应用前景.

The polyvinylalcohol/β-cyclodextrin （PVA/β-CD） nanofibers with 70% （ mass fraction） of β-CD were obtained by electrostatic spinning with hexaβuoroisopropanol （HFIP） and H2O as solvents. And after cross-linking treatment with glutaraldehyde （GA） , a water-insoluble nanofiber membrane of PVA/GA/β-CD was prepared. Compared with the products before being cross-linking, composition and morphology for the nanofibers were studied by Infrared spectroscopy and scanning electron microscopy. In addition, the adsorptive properties of the PVA/GA/β-CD nanofibers to seven water-soluble dyes were investigated. The results show that the adsorptive effect of fiber on malachite green, methyl violet and congo red are better than others, and the maximum adsorptive capacities are 124.71, 121.14 and 127.39 mg/g, respectively. After four cycles of adsorption-desorption, the dye removal rate still remains 80%. Thus, the nanofiber exhibits an excellent applicative prospect in waste water treatment with dye.