海藻酸钠/TiO_(2)纳米纤维膜的制备及对Cu^(2+)离子的吸附性能

Preparation of Sodium Alginate/TiO_(2) Nanofiber Membrane and Its Adsorption Capacity for Cu^(2+) Ions

采用静电纺丝技术制备了海藻酸钠(SA)/二氧化钛(TiO_(2))复合纳米纤维膜,并将其应用于水体中重金属离子Cu^(2+)的吸附。通过扫描电子显微镜(SEM)、傅里叶红外光谱(FT-IR)、X射线衍射仪(XRD)、接触角、力学性能等测试对复合纳米纤维膜进行了表征。结果表明,所制得的SA纳米纤维膜表面光滑,纤维呈三维杂乱排列。加入TiO_(2)后,纳米纤维的平均直径下降,亲水性能得到较大改善,拉伸强度及断裂伸长率分别为9.56 MPa和15.46%。Cu^(2+)吸附结果表明,SA/TiO_(2)纳米纤维膜对单一组分Cu^(2+)的饱和吸附可达76.99 mg/g。其吸附过程可以用Langmuir和Freundlich吸附模型来描述,从相关系数来看,SA/TiO_(2)纳米纤维对Cu^(2+)的吸附过程更加符合Freundlich模型。

Sodium alginate(SA)/titanium dioxide(TiO_(2)) composite nanofiber membrane was prepared by electrospinning technology and applied in the adsorption of heavy metal ion Cu^(2+)in water. The composite nanofiber membranes were characterized by scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FT-IR), X-ray diffraction(XRD), contact angle and mechanical properties. The results show that the surface of the composite nanofiber film is smooth, and the fibers are randomly arranged in three dimensions. After adding TiO_(2), the average diameter of nanofibers decreased and the hydrophilicity was greatly improved. The tensile strength and elongation at break are 9.56 MPa and 15.46%, respectively. The adsorption results showed that the saturated adsorption of SA/TiO_(2)nanofiber membrane for a single component of Cu^(2+)could reach 76.99 mg/g. The adsorption process can be described by Langmuir and Freundlich adsorption models. From the correlation coefficient, the adsorption process of SA/TiO_(2)nanofibers for Cu^(2+)is more consistent with Freundlich model.