在混合过程中进行高功率超声波处理以获得聚乙烯醇（PVA）/羧基化石墨烯（CG）混合基质膜（MMMs）。X射线光电子能谱和热重分析结果证实酯化反应增强。用广角X射线衍射和正电子湮没寿命谱研究了非晶区和自由体积的增加。扫描电子显微镜和原子力显微镜测量表明超声波能使CG在PVA聚合物基体中均匀分散。超声波处理提高了膜的力学性能和亲水性。PVA/CG-US膜对90 wt%乙醇水溶液的渗透通量和分离系数分别为0.79kg m-2h-1和860。对于甲醇（15 wt%）/甲基叔丁基醚混合物，其与未经超声处理的膜相比，膜的渗透通量和分离因子也显著增加。由于由于超声波工艺的简单性和无机填料的多功能性，这种方法可能有助于扩展膜在不同用途中的应用。

英文摘要：High-power ultrasonic treatment was conducted during the mixing process to obtain poly(vinyl alcohol) (PVA)/carboxylgraphene (CG) mixed matrix membranes (MMMs). Results from X-ray photoelectron spectrometer and thermogravimetric analysis confirmed the enhanced esterification reaction. The increased amorphous region and free volume were investigated by wide-angle X-ray diffraction and positron annihilation lifetime spectroscopy. Scanning electron microscope and atomic force microscope measurements suggested that ultrasonic could uniformly disperse CG in PVA polymer matrix. The mechanical properties and hydrophilicity of asprepared membrane were enhanced due to ultrasonic treatment. The permeation flux and separation factor of PVA/CG-US membrane for 90 wt % ethanol aqueous solution were 0.79 kg m-2 h-1 and 860, respectively. For methanol (15 wt %)/methyl tert-butyl ether mixture, its permeation flux and separation factor were also increased significantly compared with membranes without ultrasonic treatment. Due to the simplicity of the ultrasonic process and the versatility of the inorganic fillers, this method may contribute to the design of various MMMs and extend the application of these membranes in different uses.

题目：Poly(vinyl alcohol)/carboxyl graphene mixed matrix membranes: High-power ultrasonic treatment for enhanced pervaporation performance

DOI:10.1002/app.48526