Volume 61, Issue 1 e202113662
Communication
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Layered Double Hydroxide-Assisted Fabrication of Prussian Blue Membranes for Precise Molecular Sieving

Qi Bian

Qi Bian

State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Linggong Road NO. 2, Ganjingzi District, Dalian, 116024 China

These authors contributed equally to this work.

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Mu Zhang

Mu Zhang

State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Linggong Road NO. 2, Ganjingzi District, Dalian, 116024 China

These authors contributed equally to this work.

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Dr. Yi Liu

Dr. Yi Liu

State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Linggong Road NO. 2, Ganjingzi District, Dalian, 116024 China

These authors contributed equally to this work.

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Dr. Liangliang Liu

Dr. Liangliang Liu

State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Linggong Road NO. 2, Ganjingzi District, Dalian, 116024 China

These authors contributed equally to this work.

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Yang Li

Yang Li

State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Linggong Road NO. 2, Ganjingzi District, Dalian, 116024 China

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Dr. Chen Wang

Dr. Chen Wang

State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Linggong Road NO. 2, Ganjingzi District, Dalian, 116024 China

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Prof. Gaohong He

Prof. Gaohong He

State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Linggong Road NO. 2, Ganjingzi District, Dalian, 116024 China

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Prof. Yi Liu

Corresponding Author

Prof. Yi Liu

State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Linggong Road NO. 2, Ganjingzi District, Dalian, 116024 China

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First published: 08 November 2021
Citations: 19

Dedicated to Professor Jürgen Caro on the occasion of his 70th birthday

Graphical Abstract

For the first time, we prepared continuous polycrystalline Prussian blue (PB) membrane showing precise dye rejection and monovalent ion discrimination ability. The introduction of a calcined NiFe-CO3 layered double hydroxide buffer layer on the substrate was found to play a paramount role in the formation of PB membrane with desirable microstructure and performance.

Abstract

Prussian Blue (PB), which was first discovered as robust blue-colored pigment in the year 1706, has shown promising prospects in disease treatment, energy conversion, water splitting, and sensing. Relying on the uniform 3.2 Å-sized pore channels as well as high stability in aqueous environments, in this study, we pioneered in situ preparation of polycrystalline PB membranes to justify their dye rejection and metal ion discrimination ability in aqueous environments. Among various factors, the introduction of calcined NiFe layered double hydroxide buffer layers on porous α-Al2O3 substrates was found to play a paramount role in the formation of continuous polycrystalline PB membranes, thereby leading to excellent dye rejection efficiency (>99.0 %). Moreover, prepared PB membranes enabled discriminating different monovalent metal ions (e.g., Li+, Na+, and K+) depending on their discrepancy in Stokes diameters, showing great promise for lithium extraction from smaller-sized metal ions.

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