Homointerface covalent organic framework membranes for efficient desalination,Journal of Materials Chemistry A

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Homointerface covalent organic framework membranes for efficient desalination
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2021-09-23 , DOI: 10.1039/d1ta06439h
Jianliang Shen _{1,

2} , Jinqiu Yuan _{1,

2} , Benbing Shi _{1,

2} , Xinda You _{1,

2} , Rui Ding _{1,

2} , Tianyi Zhang _{1,

2} , Yujing Zhang _{1,

2} , Yuanzhi Deng _{1,

2} , Jingyuan Guan _{1,

2} , Mengying Long _{1,

2} , Yu Zheng _{1,

2} , Runnan Zhang _{1,

2,

3} , Hong Wu _{1,

2,

4} , Zhongyi Jiang _{1,

2,

3,

5}

Affiliation

Covalent organic frameworks (COFs) are an emergent class of crystalline porous polymers featuring a long-range regular pore structure, high porosity and excellent chemical stability. Bilayer COF membranes with tunable interfaces hold great promise in ionic and molecular separations. Herein, we designed a series of bilayer COF membranes with homointerface and heterointerface, which achieved efficient desalination performance through manipulating the interface confinement effect. COF membranes were prepared on a porous support through successively regulating the growth of imine-based 2D COF layers by in situ growth and counter-diffusion approach at ambient temperature. Narrowed sub-nanometer interlaced channels were created at the interface of the two adjacent COF layers. The rejection rate of homointerface COF membrane toward Na₂SO₄ was higher than that of heterointerface COF membranes, which was due to the synergistic enhancement of interface-confined size sieving and Donnan effect. The homointerface TpPa–SO₃H/TpPa–SO₃H/MPAN membrane exhibits a rejection rate of 98.3% for Na₂SO₄ and water flux of 13.1 L m⁻² h⁻¹ bar⁻¹, which is the highest performance among COF desalination membranes ever reported.

中文翻译：

用于高效脱盐的同界面共价有机骨架膜

共价有机骨架（COFs）是一类新兴的结晶多孔聚合物，具有长程规则孔结构、高孔隙率和优异的化学稳定性。具有可调界面的双层 COF 膜在离子和分子分离中具有广阔的前景。在此，我们设计了一系列具有同质界面和异质界面的双层 COF 膜，通过操纵界面限制效应实现了高效的脱盐性能。通过原位连续调控亚胺基二维 COF 层的生长，在多孔载体上制备 COF 膜环境温度下的生长和反扩散方法。在两个相邻 COF 层的界面处创建了狭窄的亚纳米交错通道。同界面COF膜对Na ₂ SO ₄的截留率高于异界面COF膜，这是由于界面限制尺寸筛分和唐南效应的协同增强。同质界面TpPa–SO ₃ H/TpPa–SO ₃ H/MPAN 膜对Na ₂ SO ₄的截留率为98.3% ，水通量为13.1 L m ^-2 h ^-1 bar ^-1，是同类膜中性能最高的。曾报道过 COF 脱盐膜。

更新日期：2021-10-08

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