陶瓷基金属有机框架膜的制备及其正渗透脱盐性能
作者:王子玉1, 孙阔1, 董应超12
单位: 大连理工大学 环境学院,温州大学 生命与环境科学学院
关键词: 水处理; 脱盐;陶瓷膜;金属有机框架膜;正渗透
DOI号: 10.16159/j.cnki.issn1007-8924.2024.05.008
分类号: TQ028.8
出版年,卷(期):页码: 2024,44(5):67-74

摘要:
新型正渗透膜的制备对于推动膜分离技术的创新,解决水资源和环境问题,提高分离过程的效率和可持续性具有重要的意义.本研究以陶瓷膜为载体,采用热浸涂播种法制备了Zr-fum-MOF晶种,二次生长法制备了Zr-fum-MOF金属有机框架膜,进而探究了其在正渗透过程的脱盐性能,即不同运行条件下的水盐分离性能.结果表明,热浸涂法可以在陶瓷膜载体表面播种均匀的晶种层,在晶种液质量分数为0.1%的条件下热浸涂后,继而通过二次生长可以在表面形成共生良好、无晶间缺陷且厚度均匀的金属有机框架膜.以去离子水为进料液,汲取液为2 mol/L氯化钠的条件下,水通量达到9.86 L/(m2·h),同时具有较低的比盐通量(0.43 g/L);相较之下,出现晶种团聚和针孔的Zr-fum-MOF-0.5%膜在相同运行条件下不能实现较好的水盐分离性能.将所制备的Zr-fum-MOF-0.1%膜应用于真实海水淡化也表现出较好的运行和结构稳定性.本研究所制备的陶瓷基金属有机框架膜在正渗透脱盐处理应用中显示出一定的潜力,为脱盐膜分离工艺提供了一定的技术参考和应用前景.
 
The strategic development of innovative forward osmosis membranes holds paramount significance in advancing membrane separation technology, addressing water resource and environmental challenges, and enhancing the efficiency and sustainability of separation processes. In this study, ceramic-supported Zr-fum-MOF crystal seeds were prepared using the hot dip-coating seeding method, with ceramic membranes as the substrates for secondary growth. The subsequent examination focused on evaluating the desalination performance of the ceramic-based Zr-fum-MOF-0.1% membrane in forward osmosis, with a specific emphasis on water-salt separation under diverse operational conditions. Results indicate that the hot dip coating technique effectively facilitated the uniform deposition of MOF crystal seeds on the ceramic membrane's surface. Notably, by employing a 0.1% mass fraction of crystal seed liquid and conducting three dip coating iterations, the secondary growth process yielded polycrystalline membranes characterized by a well inter-grown membrane structure with uniform thickness. In the context of forward osmosis desalination tests, employing deionized water as the feed solution and a draw solution comprising 2 mol/L sodium chloride, the ceramic-based Zr-fum-MOF membranes demonstrated a noteworthy water flux exceeding 9.86 L/(m2·h). Simultaneously, these membranes exhibited a low specific salt flux (0.43 g/L). Its application to real seawater desalination also showed good operational and structural stability. The findings underscore the potential of the ceramic-based Zr-fum-MOF membranes, synthesized in this study, for application in forward osmosis desalination, thereby contributing valuable insights and prospects to membrane  desalination process. 
 

基金项目:
国家自然科学基金项目(52261160381, 52070033)

作者简介:
王子玉(1999-),女,江西新余人,硕士生,研究方向为陶瓷基MOF膜的制备表征及水处理应用.*通讯作者,E-mail:ycdong@dlut.edu.cn

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