聚(3-羟基丁酸酯-co-4-羟基丁酸酯)@海藻酸钠复合纤维膜的制备及其对Pb2+和Cu2+的吸附性

采用三氯甲烷和N，N二甲基甲酰胺（DMF）为溶剂，制备聚（3-羟基丁酸酯-co-4-羟基丁酸酯）（P（3HB-co-4HB））纺丝溶液，并通过静电纺丝技术制备P（3HB-co-4HB）纳米纤维膜，用海藻酸钠（SA）对P（3HB-co-4HB）纳米纤维膜进行包覆，获得P（3HB-co-4HB）@SA复合纤维膜。利用SEM、比表面积仪、原子吸收光谱分别表征了P（3HB-co-4HB）@SA复合纤维膜的纤维形态、比表面积、溶液残留液离子浓度。结果表明:纺丝液浓度在12%时，P（3HB-co-4HB）纤维成纤性好；随着静电压增大，P（3HB-co-4HB）纤维直径先减小后增大。P（3HB-co-4HB）支架材料可以使SA的比表面积提高约3.9倍，P（3HB-co-4HB）@SA复合纤维膜对Cu2+离子、Pb2+离子最大吸附量分别为26.25 mg/g和36.25 mg/g，折算为SA的吸附量分别为364.58 mg/g和503.47 mg/g。 

Preparation of poly(3-hydroxybutyrate-co-4-hydroxybutyrate)@sodium alginate composite fiber membrane and its adsorption of Pb2+ and Cu2+

The poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P(3HB-co-4HB)) was dissolved by chloroform and N,N-dimethyl formamide (DMF) to prepare the spinning solution, and then P(3HB-co-4HB) nanofiber scaffold was fabricated by electrospinning. The P(3HB-co-4HB) nanofiber scaffold was coated with sodium alginate (SA) to obtain the P(3HB-co-4HB)@SA composite fiber membrane. SEM, specific surface area meter and atomic absorption spectroscopy were used to characterize fiber morphology, specific surface area, and residual ion concentration of P(3HB-co-4HB)@SA composite fiber membrane. The results show that when the spinning solution concentration is 12%, P(3HB-co-4HB) nanofibers exhibit a uniform morphology. With the static voltage increasing, the diameter of P(3HB-co-4HB) fiber decreases first and then increases. The P(3HB-co-4HB) scaffold material can increase the specific surface area of SA by 3.9 times. P(3HB-co-4HB)@SA composite fiber membrane has a maximum adsorption capacity of 26.25 mg/g and 36.25 mg/g for Cu2+ ions and Pb2+ ions, respectively, which is converted into SA adsorption capacity of 364.58 mg/g and 503.47 mg/g, respectively.