丁二酸酐接枝纤维素纳米纤维膜及其重金属离子吸附

采用热致相分离(TIPS)法以三醋酸纤维素(TCA)为原料成功制备直径为(110±28)nm TCA多孔纳米纤维膜。将TCA纤维膜通过水解转化为纤维素(Cell)、接枝制备丁二酸酐接枝改性纤维素(Cell-g-SAA)膜。将Cell膜和Cell-g-SAA膜用于吸附水中Cu~(2+)、Pb~(2+),并对膜样品的吸附动力学、等温吸附和吸附热力学进行了研究。结果表明,二级动力学拟合和Langmuir模型更适合于该体系。与Cell膜相比,改性后Cell-g-SAA膜对Cu~(2+)和Pb~(2+)的最大吸附容量分别从51.73和34.29 mg/g增加到116.41和51.73 mg/g。纤维膜对Cu~(2+)、Pb~(2+)的吸附更趋近于单层吸附且化学吸附占主导地位。

Fabrication of Succinic Acid Anhydride Grafted Cellulose Nanofiber Membrane and Its Adsorption of Heavy Metal Ions

Triacetate cellulose(TCA) porous nanofiber membranes(Cell) with diameter of (110±28) nm were successfully prepared by thermally induced phase separation. Succinic acid anhydride grafted cellulose(Cell-g-SAA) nanofiber membranes were obtained through hydrolyzation and grafting of TCA nanofibers. The Cell and Cell-g-SAA membranes were used for the adsorption of Cu²⁺ and Pb²⁺. The adsorption kinetics and thermodynamics were studied and found to fit pseudo-second-order and Langmuir model. Compared with cellulose membranes, the max adsorption capacity of Cell-g-SAA membranes for Cu²⁺ and Pb²⁺ increases from 51.73 and 34.29 mg/g to 116.41 and 51.73 mg/g, respectively. The adsorptions of Cu²⁺ and Pb²⁺ on the Cell and Cell-g-SAA membranes are more agreeable with monolayer adsorption mode via mainly chemical interactions.