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Functional reduced graphene oxide-based membranes with selective ions transport channels for zwitterionic separation based on pH gradient

Abstract

In this work, we report a method for fabricating a functional free-standing graphene membrane (FFGM) with high mechanical strength, enlarged interlayer spacing and ion channels for zwitterionic ions separation. To obtain FFGM, the anionic dye Eosin Y (EY) was introduced into graphene oxide (GO) and hydroquinone (HQ) mixture to prepare the functional graphene–based membranes on Cu foil using simply drop–casting method. By comparison with GO membrane, the molar flux and the mechanical strength of FFGM was dramatically increased. The FFGM was then equipped on the customer-built glass reservoirs for zwitterionic amino acids (AAs) separation based on the inner pH gradient, which was formed by controlling the H+ and OH– (in the feed and receiver solution) migration among rGO/GO sheets via external electric field. With the help of the inner pH gradient and external electric field, AAs could change their charge behaviors. The ionized AAs transport through FFGM and finally separation was realized.

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Publication details

The article was received on 22 Sep 2017, accepted on 02 Dec 2017 and first published on 04 Dec 2017


Article type: Paper
DOI: 10.1039/C7NR07081K
Citation: Nanoscale, 2017, Accepted Manuscript
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    Functional reduced graphene oxide-based membranes with selective ions transport channels for zwitterionic separation based on pH gradient

    Y. Wu, H. Y. Ji, F. Yang, Y. Meng, Y. Wang, J. Dai, H. Ren, G. Tan and D. Xiao, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR07081K

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