College of Environmental Science and Engineering, UNEP Tongji Institute of Environment for Sustainable Development, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, 200092, China.
J Environ Sci (China). 2012;24(4):610-6. doi: 10.1016/s1001-0742(11)60806-1.
Novel amino (-NH2) functionalized mesoporous polyvinyl pyrrolidone (PVP)/SiO2 composite nanofiber membranes were fabricated by a one-step electrospinning method using poly (vinyl alcohol) and tetraethyl orthosilicate (TEOS) mixed with cationic surfactant, cetyltrimethyl ammonium bromide (CTAB) as the structure directing agent. Ureidopropyltriethoxysilane was used for functionalization of the internal pore surfaces. The membranes were characterized by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM) images, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), element analyzer and N2 adsorption-desorption isotherms. The nanofiber diameters, average pore diameters and surface areas were 100-700 nm, 2.86 nm and 873.62 m2/g, respectively. These mesoporous membranes functionalized with -NH2 groups exhibited very high adsorptions properties based on the adsorption of Cr3+ from an aqueous solution. Equilibrium adsorption was achieved after approximately 20 min and more than 97% of chromium ions in the solution were removed. The membrane could be regenerated through acidification.
采用一步静电纺丝法，以聚乙烯醇和正硅酸乙酯（TEOS）为混合基体，阳离子表面活性剂十六烷基三甲基溴化铵（CTAB）为结构导向剂，制备了新型氨基（-NH2）功能化的介孔聚吡咯烷酮（PVP）/SiO2 复合纳米纤维膜。采用脲丙基三乙氧基硅烷对内部孔表面进行功能化。采用扫描电子显微镜（SEM）、高分辨率透射电子显微镜（HRTEM）图像、X 射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、元素分析仪和 N2 吸附-脱附等温线对膜进行了表征。纳米纤维的直径、平均孔径和比表面积分别为 100-700nm、2.86nm 和 873.62m2/g。这些经-NH2 基团功能化的介孔膜对水溶液中的 Cr3+表现出很高的吸附性能。在大约 20 分钟后达到平衡吸附，溶液中超过 97%的铬离子被去除。通过酸化可以对膜进行再生。
