Secondary-assembled defect-free MOF membrane via triple-needle electrostatic atomization for highly stable and selective organics permeation

被引：14

作者：

Chen, Jingjing ^{[1
]}

Wu, Xiaoli ^{[1
]}

Chen, Chongchong ^{[1
]}

Chen, Yihao ^{[1
]}

Li, Wenpeng ^{[1
]}

Wang, Jingtao ^{[1
]}

机构：

[1] Zhengzhou Univ, Henan Inst Adv Technol, Sch Chem Engn, Zhengzhou 450001, Henan, Peoples R China

来源：

JOURNAL OF MEMBRANE SCIENCE | 2022年 / 648卷

基金：

中国国家自然科学基金;

关键词：

Metal-organic framework lamellar membrane; Secondary-assembly; Electrostatic atomization; Membrane microdefect; Organic solvent nanofiltration; GRAPHENE OXIDE; SOLVENT NANOFILTRATION; SURFACE-AREA; NANOSHEETS; TRANSPORT;

D O I：

10.1016/j.memsci.2022.120382

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Two-dimensional lamellar membranes featuring well-defined nanochannels hold great promise for efficient organics separation. However, the extensively existed non-selective microdefects within laminate architecture would impair separation efficiency and structure stability of membranes. Herein, defect-free metal-organic framework (MOF) lamellar membrane is facilely constructed by triple-needle electrostatic atomization technology. Specifically, one needle atomizes small-sized Cu-TCPP MOF nanosheets (TCPP = meso-tetra(4-carboxyphenyl)porphyrin) to build lamellar skeleton, and the other two needles meantime atomize Cu2+ and TCPP to secondary-assemble crystals among nanosheets. In this manner, these non-selective microdefects are subtly sutured by the regenerated crystals with identical chemical components, resulting in a defect-free MOF lamellar membrane with enhanced structural stability. Importantly, this novel secondary-assembly method highly enhances the separation efficiency and meanwhile keeps high organics permeation for MOF membrane, with rejection of 93.8% for Rose Bengal (1.2 nm) and acetone permeance of 86.9 L m(-2) h(-1) bar(-1). In addition, the multipoint connection between nanosheets and crystals ensures excellent surface shearing and compaction resistance for MOF membrane, permitting high and steady operation performance for over 100 h. This secondary-assembly methodology by one-step process to construct defect-free and steady lamellar membrane provides a new avenue for the development of efficient separation membranes.

引用

页数：9