期刊
SURFACES AND INTERFACES
卷 44, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.surfin.2023.103607
关键词
Nanofiltration; Interfacial polymerization; Transition layer; UiO-66-(OH) 2; Water purification
In this study, a continuous and uniform ultra-thin polyamide (PA) membrane, ranging from 10 to 20 nm, was successfully synthesized by utilizing a UiO-66-(OH)2 n-hexane dispersion as a transition layer. The presence of the transition layer improved interface stability and facilitated bidirectional diffusion-contact reaction between the monomers, resulting in superior thinness and uniformity of the PA active layers.
The synthesis of ultra-thin, uniform and continuous polyamide (PA) membranes is a crucial prerequisite for enhancing their desalination performance. Research has indicated that effectively slowing down the interfacial polymerization (IP) reaction and promoting the interface stability are key strategies for achieving ultra-thin, uniformly nano-structured membranes with excellent performance. Herein, we have demonstrated the successful design of a continuous and uniform PA membrane, ranging from 10 to 20 nm, by utilizing the UiO-66-(OH)2 n-hexane dispersion as a transition layer to regulate IP reaction and enable efficient water-salt separation. The results showed that the presence of the transition layer facilitated a bidirectional diffusion-contact reaction between the two monomers, resulting in improved interface stability and alleviating the occurrence of severe IP that may lead to heterogeneous membrane structures. As a result, the PA active layers formed through this approach exhibited superior thinness and uniformity compared to those produced via traditional IP methods. Moreover, the transition layer enabled uniform pre-polymerization of UiO-66-(OH)2 at the reaction interface by pre-exposing it to down-diffusing acyl chloride monomers. This ensured the continuity of membrane structure while creating additional free volume within the membrane. This work presented a scalable method for manufacturing ultra-thin, defect-free, homogeneous, and high-performance nanofiltration membranes.
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