College of Environmental Science and Engineering, UNEP TONGJI Institute of Environment for Sustainable Development, State Key Laboratory of Pollution Control and Resource Reuse Study, Tongji University, Mingjing Building, Siping Road 1239, Shanghai 200092, China.
J Environ Manage. 2012 Dec 15;112:10-6. doi: 10.1016/j.jenvman.2012.05.031. Epub 2012 Aug 2.
Novel NH(2)-functionalized cellulose acetate (CA)/silica composite nanofibrous membranes were successfully prepared by sol-gel combined with electrospinning technology. Tetraethoxysilane (TEOS) as a silica source, CA as precursor and 3-ureidopropyltriethoxysilane as a coupling agent were used in membrane preparation. The membrane's chemical and morphological structures were investigated by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM) images, X-ray diffraction (XRD), element analyzer, Fourier-transform infrared spectroscopy (FTIR) and N(2) adsorption-desorption isotherms. The composite nanofibrous membranes exhibited high surface area and porosity. The membranes were used for Cr(VI) ion removal from aqueous solution through static and dynamic experiments. The adsorption behavior of Cr(VI) can be well described by the Langmuir adsorption model, and the maximum adsorption capacity for Cr(VI) is estimated to be 19.46 mg/g. The membrane can be conveniently regenerated by alkalization. Thus the composite membrane prepared from biodegradable raw material has potential applications in the field of water treatment.
采用溶胶-凝胶结合静电纺丝技术成功制备了新型 NH(2)-功能化醋酸纤维素（CA）/二氧化硅复合纳米纤维膜。四乙氧基硅烷（TEOS）作为硅源、CA 作为前驱体和 3-脲丙基三乙氧基硅烷作为偶联剂用于膜的制备。通过扫描电子显微镜（SEM）、高分辨率透射电子显微镜（HRTEM）图像、X 射线衍射（XRD）、元素分析、傅里叶变换红外光谱（FTIR）和 N(2)吸附-脱附等温线对膜的化学和形态结构进行了研究。复合纳米纤维膜具有高的比表面积和孔隙率。通过静态和动态实验，将膜用于从水溶液中去除 Cr(VI)离子。Cr(VI)的吸附行为可以很好地用朗缪尔吸附模型来描述，Cr(VI)的最大吸附容量估计为 19.46mg/g。该膜可以通过碱化方便地再生。因此，由可生物降解原料制备的复合膜在水处理领域具有潜在的应用。
