Nowadays, membrane recycling has received increasing attention in water treatment, gas separation and pervaporation. Compared with polymeric substrates, inorganic substrates possess higher mechanical and thermal stability, which can be reused to balance the high cost. In this work, for the first time, we studied the recycle of inorganic substrate that was used for fabricating polymeric composite membranes. A facile approach was proposed to recycle ceramic substrate from PDMS/ceramic composite membranes with thermal degradation followed by ultrasonic cleaning. The thermal degradation compositions of PDMS membrane under air or nitrogen atmosphere were investigated by using TGA-IR, XRD and XPS analysis. Influence factors of the recycle approach including degradation conditions, cleaning approach and multi-recycle process were explored to optimize the transport properties of ceramic substrate and PDMS/ceramic composite membrane. The interfacial morphologies and adhesion of the PDMS membrane coated on the recycled ceramic substrate were characterized by SEM and nano-scratch measurement. The results demonstrated that PDMS composite membrane fabricated on the ceramic substrate with 10 times recycle by thermal degradation in nitrogen at 800 °C for 4 h and ultrasonic cleaning could still achieve >92% separation performance and interfacial adhesive force of the fresh PDMS/ceramic composite membrane. Specifically, the membrane exhibited stable flux of 1.2 kg/m²h and separation factor of 8.1 for 120 h continuous pervaporation separation of 5 wt% ethanol/water at 40 °C. Additionally, ∼75% energy saving relative to synthesizing fresh ceramic substrate was estimated for applying the feasible recycle approach.

如今，膜回收在水处理、气体分离和渗透蒸发方面受到越来越多的关注。与聚合物基材相比，无机基材具有更高的机械和热稳定性，可重复使用以平衡高成本。在这项工作中，我们首次研究了用于制造聚合物复合膜的无机基材的回收。提出了一种简便的方法，通过热降解和超声波清洗从 PDMS/陶瓷复合膜中回收陶瓷基材。采用TGA-IR、XRD和XPS分析方法研究了空气或氮气气氛下PDMS膜的热降解成分。回收方法的影响因素包括降解条件、探索了清洗方法和多次循环过程以优化陶瓷基板和PDMS/陶瓷复合膜的传输性能。通过扫描电镜和纳米划痕测量表征了涂覆在回收陶瓷基板上的 PDMS 膜的界面形态和附着力。结果表明，在 800 ℃氮气中热降解 4 h 和超声清洗 10 次回收在陶瓷基板上制备的 PDMS 复合膜仍然可以达到新鲜的 PDMS/陶瓷复合材料的 >92% 的分离性能和界面粘附力。膜。具体而言，该膜表现出稳定的通量为 1.2 kg/m 通过扫描电镜和纳米划痕测量对涂覆在再生陶瓷基板上的 PDMS 膜的界面形貌和附着力进行了表征。结果表明，在 800 ℃氮气中热降解 4 h 和超声清洗 10 次回收在陶瓷基板上制备的 PDMS 复合膜仍然可以达到新鲜的 PDMS/陶瓷复合材料的 >92% 的分离性能和界面粘附力。膜。具体而言，该膜表现出稳定的通量为 1.2 kg/m 通过扫描电镜和纳米划痕测量表征了涂覆在回收陶瓷基板上的 PDMS 膜的界面形态和附着力。结果表明，在 800 ℃氮气中热降解 4 h 和超声清洗 10 次回收在陶瓷基板上制备的 PDMS 复合膜仍然可以达到新鲜的 PDMS/陶瓷复合材料的 >92% 的分离性能和界面粘附力。膜。具体而言，该膜表现出稳定的通量为 1.2 kg/m 新鲜PDMS/陶瓷复合膜的92%分离性能和界面粘附力。具体而言，该膜表现出稳定的通量为 1.2 kg/m 新鲜PDMS/陶瓷复合膜的92%分离性能和界面粘附力。具体而言，该膜表现出稳定的通量为 1.2 kg/m²小时和 8.1 的分离系数，用于在 40 °C 下连续渗透蒸发 5 wt% 乙醇/水 120 小时。此外，估计相对于合成新鲜陶瓷基材可节省约 75% 的能源，以应用可行的回收方法。