期刊
JOURNAL OF MEMBRANE SCIENCE
卷 623, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2021.119075
关键词
Multidimensional assembly; MXene-CNT membranes; Ultrathin; Anti-swelling; Water purification
资金
- National Natural Science Foundation of China [21838005, 21676139]
- National Key Research and Development Program of China [2017YFB0306901]
- Key Scientific Research and Development Projects of Jiangsu Province [BE201800901]
The multidimensional MXene-carbon nanotube (CNT) ultrathin membranes were successfully assembled by loading a MXene intercalated with CNTs onto a tubular ceramic membrane, which considerably improved the permeability and rejection performance of the membranes. The membranes exhibited a distinct suppressed swelling property via a facile thermal crosslinking process and showed promising anti-swelling property and stability in long-term operation studies. This assembly and thermal crosslinking strategy represents a new avenue for developing high-performance membranes for water purification based on MXene and other 2D materials.
Severe stacking and swelling properties are critical issues in two-dimensional (2D) lamellar membrane fabrication and separation processes that can result in low flux and poor rejection. Herein, we propose the assembly of multidimensional MXene-carbon nanotube (CNT) ultrathin membranes by loading a MXene intercalated with CNTs onto a tubular ceramic membrane. Benefiting from the modes of van der Waals interactions (hydrogen bond) and repulsion forces between the MXene and functionalized CNTs, the one-dimensional (1D) CNTs are well dispersed and intercalated into the 2D MXene nanosheets, forming a uniform network and continuous three-dimensional (3D) labyrinthine short mass transfer channels, which can considerably improve the permeability and rejection performance of the membranes. Furthermore, the membranes exhibit a distinct suppressed swelling property via a facile thermal crosslinking process (-OH + -OH = O + H2O and -COOH + -OH = -COO + H2O), accompanied by the formation of new chemical bonds (Ti-O-C and Ti-COO-C) due to dehydroxylation between the neighboring MXene nanosheets and CNTs. Additionally, 50 h long-term operation studies also indicate the promising anti-swelling property and stability of the MXene-CNT membranes. This multidimensional (1D and 2D) assembly and thermal crosslinking strategy represents a new avenue for the facile and scalable development of MXene-based and other 2D material-derived high-performance membranes for water purification.
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