Graphene quantum dot engineered ultrathin loose polyamide nanofilms for high-performance nanofiltration
Pursuing high water permeance with ultrahigh selectivity is a longstanding objective for nanofiltration membranes. At present, simultaneously engineering an ultrathin thickness and loose architecture of nanofiltration membranes is in great demand and a severe challenge. Herein, we demonstrate a two-...
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| Published in | Journal of materials chemistry. A, Materials for energy and sustainability Vol. 8; no. 45; pp. 2393 - 23938 |
|---|---|
| Main Authors | , , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Cambridge
Royal Society of Chemistry
24.11.2020
|
| Subjects | |
| Online Access | Get full text |
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| Abstract | Pursuing high water permeance with ultrahigh selectivity is a longstanding objective for nanofiltration membranes. At present, simultaneously engineering an ultrathin thickness and loose architecture of nanofiltration membranes is in great demand and a severe challenge. Herein, we demonstrate a two-in-one strategy toward ultrathin loose polyamide (ULPA) nanofilms
via
graphene quantum dot (GQD)-mediated support-free interfacial polymerization. Featuring favorable chemical interactions and size, GQDs serve as quasi-molecule-scale regulators to reduce the diffusion rate of piperazine, and generate ULPA nanofilms with a controllable thickness from 18.3 to 5.5 nm. Concomitantly, GQDs are incorporated into ULPA during interfacial polymerization to construct a loose structure, which is manifested by an enlarged pore size. The resultant ULPA composite membranes overcome the upper-bound limit of polyamide membranes, exhibiting a water permeance of 32.1 L m
−2
h
−1
bar
−1
with an ultrahigh Na
2
SO
4
rejection of 99.6%, as well as an unprecedented Cl
−
/SO
4
2−
selectivity of 205.8 that reaches the highest value ever reported. This two-in-one strategy may open a facile avenue to design advanced membranes for environmental and energy relevant applications.
Graphene quantum dot-mediated interfacial polymerization generates ultrathin loose polyamide nanofilms for high-performance nanofiltration. |
|---|---|
| AbstractList | Pursuing high water permeance with ultrahigh selectivity is a longstanding objective for nanofiltration membranes. At present, simultaneously engineering an ultrathin thickness and loose architecture of nanofiltration membranes is in great demand and a severe challenge. Herein, we demonstrate a two-in-one strategy toward ultrathin loose polyamide (ULPA) nanofilms via graphene quantum dot (GQD)-mediated support-free interfacial polymerization. Featuring favorable chemical interactions and size, GQDs serve as quasi-molecule-scale regulators to reduce the diffusion rate of piperazine, and generate ULPA nanofilms with a controllable thickness from 18.3 to 5.5 nm. Concomitantly, GQDs are incorporated into ULPA during interfacial polymerization to construct a loose structure, which is manifested by an enlarged pore size. The resultant ULPA composite membranes overcome the upper-bound limit of polyamide membranes, exhibiting a water permeance of 32.1 L m⁻² h⁻¹ bar⁻¹ with an ultrahigh Na₂SO₄ rejection of 99.6%, as well as an unprecedented Cl⁻/SO₄²⁻ selectivity of 205.8 that reaches the highest value ever reported. This two-in-one strategy may open a facile avenue to design advanced membranes for environmental and energy relevant applications. Pursuing high water permeance with ultrahigh selectivity is a longstanding objective for nanofiltration membranes. At present, simultaneously engineering an ultrathin thickness and loose architecture of nanofiltration membranes is in great demand and a severe challenge. Herein, we demonstrate a two-in-one strategy toward ultrathin loose polyamide (ULPA) nanofilms via graphene quantum dot (GQD)-mediated support-free interfacial polymerization. Featuring favorable chemical interactions and size, GQDs serve as quasi-molecule-scale regulators to reduce the diffusion rate of piperazine, and generate ULPA nanofilms with a controllable thickness from 18.3 to 5.5 nm. Concomitantly, GQDs are incorporated into ULPA during interfacial polymerization to construct a loose structure, which is manifested by an enlarged pore size. The resultant ULPA composite membranes overcome the upper-bound limit of polyamide membranes, exhibiting a water permeance of 32.1 L m −2 h −1 bar −1 with an ultrahigh Na 2 SO 4 rejection of 99.6%, as well as an unprecedented Cl − /SO 4 2− selectivity of 205.8 that reaches the highest value ever reported. This two-in-one strategy may open a facile avenue to design advanced membranes for environmental and energy relevant applications. Graphene quantum dot-mediated interfacial polymerization generates ultrathin loose polyamide nanofilms for high-performance nanofiltration. Pursuing high water permeance with ultrahigh selectivity is a longstanding objective for nanofiltration membranes. At present, simultaneously engineering an ultrathin thickness and loose architecture of nanofiltration membranes is in great demand and a severe challenge. Herein, we demonstrate a two-in-one strategy toward ultrathin loose polyamide (ULPA) nanofilms via graphene quantum dot (GQD)-mediated support-free interfacial polymerization. Featuring favorable chemical interactions and size, GQDs serve as quasi-molecule-scale regulators to reduce the diffusion rate of piperazine, and generate ULPA nanofilms with a controllable thickness from 18.3 to 5.5 nm. Concomitantly, GQDs are incorporated into ULPA during interfacial polymerization to construct a loose structure, which is manifested by an enlarged pore size. The resultant ULPA composite membranes overcome the upper-bound limit of polyamide membranes, exhibiting a water permeance of 32.1 L m −2 h −1 bar −1 with an ultrahigh Na 2 SO 4 rejection of 99.6%, as well as an unprecedented Cl − /SO 4 2− selectivity of 205.8 that reaches the highest value ever reported. This two-in-one strategy may open a facile avenue to design advanced membranes for environmental and energy relevant applications. Pursuing high water permeance with ultrahigh selectivity is a longstanding objective for nanofiltration membranes. At present, simultaneously engineering an ultrathin thickness and loose architecture of nanofiltration membranes is in great demand and a severe challenge. Herein, we demonstrate a two-in-one strategy toward ultrathin loose polyamide (ULPA) nanofilms via graphene quantum dot (GQD)-mediated support-free interfacial polymerization. Featuring favorable chemical interactions and size, GQDs serve as quasi-molecule-scale regulators to reduce the diffusion rate of piperazine, and generate ULPA nanofilms with a controllable thickness from 18.3 to 5.5 nm. Concomitantly, GQDs are incorporated into ULPA during interfacial polymerization to construct a loose structure, which is manifested by an enlarged pore size. The resultant ULPA composite membranes overcome the upper-bound limit of polyamide membranes, exhibiting a water permeance of 32.1 L m−2 h−1 bar−1 with an ultrahigh Na2SO4 rejection of 99.6%, as well as an unprecedented Cl−/SO42− selectivity of 205.8 that reaches the highest value ever reported. This two-in-one strategy may open a facile avenue to design advanced membranes for environmental and energy relevant applications. |
| Author | You, Xinda Li, Ya Shen, Jianliang Zhang, Runnan Jiang, Zhongyi Yuan, Jinqiu Wu, Hong Su, Yanlei Li, Yafei |
| AuthorAffiliation | Tianjin University Tianjin Key Laboratory of Membrane Science and Desalination Technology International Campus of Tianjin University Joint School of National University of Singapore School of Chemical Engineering and Technology Key Laboratory for Green Chemical Technology Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) |
| AuthorAffiliation_xml | – name: Joint School of National University of Singapore – name: International Campus of Tianjin University – name: Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) – name: Tianjin University – name: Tianjin Key Laboratory of Membrane Science and Desalination Technology – name: Key Laboratory for Green Chemical Technology – name: School of Chemical Engineering and Technology |
| Author_xml | – sequence: 1 givenname: Yafei surname: Li fullname: Li, Yafei – sequence: 2 givenname: Xinda surname: You fullname: You, Xinda – sequence: 3 givenname: Ya surname: Li fullname: Li, Ya – sequence: 4 givenname: Jinqiu surname: Yuan fullname: Yuan, Jinqiu – sequence: 5 givenname: Jianliang surname: Shen fullname: Shen, Jianliang – sequence: 6 givenname: Runnan surname: Zhang fullname: Zhang, Runnan – sequence: 7 givenname: Hong surname: Wu fullname: Wu, Hong – sequence: 8 givenname: Yanlei surname: Su fullname: Su, Yanlei – sequence: 9 givenname: Zhongyi surname: Jiang fullname: Jiang, Zhongyi |
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| Snippet | Pursuing high water permeance with ultrahigh selectivity is a longstanding objective for nanofiltration membranes. At present, simultaneously engineering an... |
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| SubjectTerms | Chemical interactions Diffusion rate energy Graphene Membranes Nanofiltration nanosheets Nanotechnology Piperazine Polyamide resins Polyamides Polymerization Pore size Porosity Quantum dots Regulators Reluctance Selectivity Sodium sulfate Thickness Upper bounds |
| Title | Graphene quantum dot engineered ultrathin loose polyamide nanofilms for high-performance nanofiltration |
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