膜科学与技术

陶瓷基双疏膜的制备及其氨氮废水处理性能

作者：许钊娜，孙春意，董应超

单位：工业生态与环境工程教育部重点实验室，大连理工大学环境学院，大连 116024

关键词：氨氮废水，陶瓷膜，双疏膜，膜蒸馏，传质系数，选择性

出版年,卷(期):页码： 2023,43(6):89-97

摘要：

开发有效处理氨氮废水的高效膜技术具有重要的研究意义，本研究以尖晶石（spinel）陶瓷膜为载体，通过二氧化硅纳米颗粒（Nano-SiO2）负载和长链氟硅烷修饰，形成低表面能和多级凹入表面结构的陶瓷基双疏膜（F-SiO2-spinel），水和油的接触角分别为163.2°±6.8°和122.4°±2.8°。进而研究了陶瓷基双疏膜在直接接触膜蒸馏过程处理氨氮废水的性能，重点探究了不同运行条件下的传质分离性能。结果表明，降低进料液温度能有效提高选择性，而提高进料液pH值对选择性和传质过程都具有促进作用。当进料液温度为30 ℃，pH值为12时，F-SiO2-spinel陶瓷基双疏膜的传质系数达到4.8×10-5 m/s，选择性达到34.14，优于氟化陶瓷膜（F-spinel）。本研究制备的陶瓷基双疏膜在氨氮废水处理应用中显示出一定的潜力，可为膜法氨氮废水的高效处理提供一种新途径。

It is of great significance to develop high efficiency membrane technology for effective treatment of ammonia wastewater. In this study, spinel ceramic membrane was used as the substrate to prepare ceramic-based omniphobic membrane (F-SiO2-spinel) by silica nanoparticles (nano-SiO2) coating followed by perfluorooctyltrietheoxysilane (FDTS) fluorination to construct a re-entrant structure with low surface energy. The contact angles of water and oil are 163.2°±6.8° and 122.4°±2.8°, respectively. The direct contact membrane distillation (DCMD) performance of the ceramic-based omniphobic membranes was studied for treatment of ammonia wastewater, focusing on selectivity performance under different operating conditions. The results show that reducing feed temperature could effectively improve the selectivity, and that increasing feed pH could enhance the selectivity and mass transfer coefficient. When feed temperature and feed pH were 30 ℃ and 12, respectively, the NH3-N mass transfer coefficient of F-SiO2-spinel ceramic membrane was 4.8×10-5 m/s and the selectivity coefficient was 34.14, which outperforms fluorinated F-spinel ceramic membrane. The fabricated ceramic-based omniphobic membrane showed a promising potential in the application of ammonia wastewater treatment, thus providing a new method for highly efficient membrane-based ammonia wastewater treatment.

许钊娜（1998-），女，福建莆田人，硕士研究生，研究方向为陶瓷基双疏膜的制备表征及水处理应用，E-mail：zoraxu@mail.dlut.edu.cn

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