The recovery of dimethylformamide (DMF) by pervaporation is less energy intensive and more economical than the traditional distillation method. High/pure silica zeolite is a typical organics perm-selective material for pervaporation membrane due to its hydrophobic nature, demonstrating great potential for recovering organic components from aqueous solutions. In this study, as an attempt to further enhance the membrane hydrophobicity, titanium and zirconium-substituted MEL type zeolite membranes (Ti-silicalite-2 and Zr-silicalite-2) were synthesized on the α-Al₂O₃ discs by a secondary growth method. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) results confirmed the isomorphous substitution of the MEL framework by Ti and Zr atoms. The effects of isomorphous substitution, feed temperature and concentration on the DMF recovery performance were investigated via systematically designed pervaporation experiments. The fluxes and separation factors both increased with the isomorphous substitution of heteroatom, as well as increasing feed temperature and decreasing feed concentration. The Ti-silicalite-2 membrane exhibited a high separation factor of 6.4 with a total flux of 0.98 kg·m⁻²·h⁻¹ for a 5 wt% DMF/water feed at 343 K.

与传统蒸馏方法相比，通过渗透蒸发回收二甲基甲酰胺 (DMF) 的能耗更低且更经济。由于其疏水性，高/纯二氧化硅沸石是渗透蒸发膜的典型有机物选择性渗透材料，显示出从水溶液中回收有机组分的巨大潜力。在本研究中，为了进一步提高膜的疏水性，在α- Al ₂ O ₃上合成了钛和锆取代的 MEL 型沸石膜（Ti-silicalite-2 和 Zr-silicalite-2）。光盘通过二次生长方法。X 射线衍射 (XRD) 和傅里叶变换红外光谱 (FTIR) 结果证实了 MEL 骨架被 Ti 和 Zr 原子同晶取代。通过系统设计的渗透蒸发实验研究了同晶取代、进料温度和浓度对 DMF 回收性能的影响。通量和分离因子都随着杂原子的同晶取代以及进料温度的升高和进料浓度的降低而增加。Ti-silicalite-2 膜表现出 6.4 的高分离因子，在 343 K 下，对于 5 wt% DMF/水进料，总通量为 0.98 kg·m ^-2 ·h ^-1。