埃洛石纳米管掺杂海藻酸复合膜制备及其渗透蒸发脱水研究

埃洛石纳米管掺杂海藻酸复合膜制备及其渗透蒸发脱水研究

Using natural silicon skeleton material halloysite nanotubes (HNT) as a filler and introducing it into the sodium alginate (SA) polymer matrix, and then spin-coating it on a polyacrylonitrile (PAN) substrate membrane to prepare the SA - HNT/PAN membrane, the pervaporation ethanol dehydration performance of the membrane was investigated. The effects of the HNT filling amount on the membrane morphology, chemical structure and thermal stability were studied by scanning electron microscopy, infrared spectroscopy, thermogravimetric analysis, etc. The effects of different HNT filling amounts, pervaporation operating temperatures and feed liquid compositions on the separation performance were investigated. The results show that adding a hydrophilic tubular HNT filler in the SA matrix can simultaneously improve the selectivity and permeability of the membrane. When the mass fraction of HNT filling is 4%, the performance of the prepared SA - HNT/PAN membrane is the best, and the permeation flux and separation factor reach 1722 g/(m²·h) and 1415 respectively.

采用天然硅骨架材料埃洛石纳米管(HNT)为填充剂,引入海藻酸钠(SA)高分子基质中,旋涂于聚丙烯腈(PAN)基膜上制得SA-HNT/PAN膜,考察了膜的渗透蒸发乙醇脱水性能.通过扫描电子显微镜、红外光谱、热失重分析等研究了HNT填充量对膜形貌、化学结构及热稳定性的影响,考察了不同HNT填充量、渗透蒸发操作温度及原料液组成对分离性能的影响.结果表明,在SA基质中加入具有亲水性的管状HNT填充剂可同时提升膜的选择性与渗透性.当HNT的填充质量分数为4%时,所制得的SA-HNT/PAN膜的性能最优,渗透通量和分离因子分别达到1 722g/(m~2·h)和1 415.