聚酯/角蛋白纳米纤维膜的制备及其铬离子吸附性能

Preparation of polyester/keratin nanofiber membrane and its adsorption property of Cr(Ⅵ)

为提高纳米纤维膜对Cr(VI)的吸附性能,使用静电纺丝法制备聚酯/角蛋白纳米纤维膜。从羊毛中提取角蛋白并加入到聚对苯二甲酸乙二醇酯(PET)中以制备复合纳米纤维膜;探究了影响去除水溶液中铬离子过程的实验因素,如溶液pH值和角蛋白含量。结果表明:通过扫描电子显微镜观察吸附前后纳米纤维膜的表面可知,铬离子附着在纤维膜的表面和孔隙中;水接触角测试证明了角蛋白的加入可提高复合膜的亲水性,纳米纤维膜对铬离子的吸附性能受溶液pH值和角蛋白的含量影响,在pH值为3、聚酯与角蛋白比例为1∶1时,纳米纤维膜的最大吸附容量为78.82 mg/g;FTIR和XPS的结果表明:角蛋白的酰胺键、氨基和二硫键参与了吸附过程。

The polyester/keratin nanofiber membrane was prepared by electrospinning method in order to improve the feasibility of nanofiber membrane adsorption of Cr(VI). Keratin was extracted from wool and added into polyethylene terephthalate(PET) to prepare composite nanofiber membranes. Experimental factors affecting removal process of Cr(VI) such as pH and the ratio of keratin to PET were studied. The surface of the nanofiber membrane before and after adsorption can be observed by SEM. The results show that Cr(VI) adhere to the surface and pores of the membrane. The water contact angle proves that the addition of keratin can improve the hydrophilicity of the composite membrane. The adsorption performance of nanofiber membrane for chromium ions is affected by the pH of the solution and the content of keratin. The maximum adsorption capacity of the nanofiber membranes is 78.82 mg/g at pH 3 with the ratio of polyester to keratin is 1:1. The results of FTIR and XPS indicate that the amide bond, amino group and disulfide bond of keratin are involved in the adsorption process.