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Preparation and performance of ceramic-based omniphobic membrane for ammonia wastewater treatment

Authors： XU Zhaona, Sun Chunyi, DONG Yingchao

Units： Key Laboratory of Industrial Ecology and Environmental Engineering, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China

KeyWords： ammonia wastewater; ceramic membrane; omniphobic membrane; membrane distillation; mass transfer coefficient; selectivity

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2023,43(6):89-97

Abstract：

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.

Funds：

国家自然科学基金项目（52261160381和52070033）

AuthorIntro：

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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