In situ preparation of Al-containing PVDF ultrafiltration membrane via sol-gel process.
In situ preparation of Al-containing PVDF ultrafiltration membrane via sol-gel process.
复制标题
DOI：
10.1016/j.jcis.2011.09.001
复制
发表时间：
2011-12
影响因子：
9.9
通讯作者：
Ruizhi Pang;Jiansheng Li;K. Wei;Xiuyun Sun;Jinyou Shen;Weiqing Han;Lianjun Wang
中科院分区：
文献类型：
--
作者：
Ruizhi Pang;Jiansheng Li;K. Wei;Xiuyun Sun;Jinyou Shen;Weiqing Han;Lianjun Wang
最近，在聚合物膜内共混的无机纳米粒子在废水处理中显示出改善的渗透性能。然而，纳米颗粒的团聚仍然是产生均匀表面的主要障碍之一。在这项研究中，一种新的方法，原位制备含铝的聚偏氟乙烯超滤膜，以提高纳米粒子的分散报告。该方法的策略是将联合收割机溶胶-凝胶法与传统的浸渍沉淀法相结合。在含有氯化铝的N，N-二甲基甲酰胺（DMF）溶剂中，通过添加阴离子交换树脂合成铝溶胶。然后通过将PVDF聚合物溶解在Al溶胶中获得均匀的含Al PVDF浇铸溶液。通过沉淀动力学和形态学研究了成膜机理。结果表明，Al的加入可以加速铸膜液的相转化.扫描电子显微镜图像显示，一个典型的过渡，从海绵状结构的指状结构发生与Al物种含量的增加。通过透射电子显微镜和X射线光电子能谱仪进一步观察了铝物种在膜基质中的存在和分散状态。结果表明，Al物种纳米粒子在PVDF基体中分散良好。动态抗BSA污染实验表明，含铝PVDF膜具有改善的分离性能比纯PVDF膜。
Recently, inorganic nanoparticles blended within polymeric membranes have shown improved antifouling performance in wastewater treatment. However, agglomeration of nanoparticles remains as one of the major obstacles for generating a uniform surface. In this study, a new method for in situ preparation of Al-containing PVDF ultrafiltration membranes to improve the dispersion of nanoparticles is reported. The strategy of this method is to combine sol–gel process with traditional immersion precipitation process. Al sol was synthesized by the addition of anionic exchange resin in N,N-dimethylformamide (DMF) solvent containing aluminum chloride. Homogeneous Al-containing PVDF casting solution was then obtained by dissolving PVDF polymer in the Al sol. The membrane formation mechanism was investigated by precipitation kinetics and morphology. Results indicate that the addition of Al species can accelerate phase inversion of casting solution. Scanning electron microscopic images show that a typical transition from sponge-like structure to finger-like structure occurred with increasing Al species content. The existence and dispersion states of Al species in the resultant membrane matrix were further examined by transmission electron microscope and X-ray photoelectron spectrometer. The results indicate the Al species nanoparticles were well dispersed throughout PVDF matrix. Dynamic BSA fouling resistance experiments demonstrate the Al-containing PVDF membranes possess improved separation performances over the pure PVDF membranes.