A Facile Way to Fabricate GO-EDA/Al<sub>2</sub>O<sub>3</sub> Tubular Nanofiltration Membranes with Enhanced Desalination Stability via Fine-Tuning the pH of the Membrane-Forming Suspensions
Pristine graphene oxide (GO)-based membranes have proven promising for molecular and ion separation owing to efficient molecular transport nanochannels, but their separation ability in an aqueous environment is limited by the natural swelling tendency of GO. To obtain a novel membrane with anti-swel...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-05-01
|
| Series: | Membranes |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2077-0375/13/5/536 |
| _version_ | 1797599126611820544 |
|---|---|
| author | Chunxiao Ding Hong Qi |
| author_facet | Chunxiao Ding Hong Qi |
| author_sort | Chunxiao Ding |
| collection | DOAJ |
| description | Pristine graphene oxide (GO)-based membranes have proven promising for molecular and ion separation owing to efficient molecular transport nanochannels, but their separation ability in an aqueous environment is limited by the natural swelling tendency of GO. To obtain a novel membrane with anti-swelling behavior and remarkable desalination capability, we used the Al<sub>2</sub>O<sub>3</sub> tubular membrane with an average pore size of 20 nm as the substrate and fabricated several GO nanofiltration ceramic membranes with different interlayer structures and surface charges by fine-tuning the pH of the GO-EDA membrane-forming suspension (pH = 7, 9, 11). The resultant membranes could maintain desalination stability, whether immersed in water for 680 h or operated under a high-pressure environment. When the pH of the membrane-forming suspension was 11, the prepared GE-11 membrane showed a rejection of 91.5% (measured at 5 bar) towards 1 mM Na<sub>2</sub>SO<sub>4</sub> after soaking in water for 680 h. An increase in the transmembrane pressure to 20 bar resulted in an increase in the rejection towards the 1 mM Na<sub>2</sub>SO<sub>4</sub> solution to 96.3%, and an increase in the permeance to 3.7 L·m<sup>−2</sup>·h<sup>−1</sup>·bar<sup>−1</sup>. The proposed strategy in varying charge repulsion is beneficial to the future development of GO-derived nanofiltration ceramic membranes. |
| first_indexed | 2024-03-11T03:30:19Z |
| format | Article |
| id | doaj.art-5c637f75637b4bb184d1b2198c0889a8 |
| institution | Directory Open Access Journal |
| issn | 2077-0375 |
| language | English |
| last_indexed | 2024-03-11T03:30:19Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj.art-5c637f75637b4bb184d1b2198c0889a82023-11-18T02:24:50ZengMDPI AGMembranes2077-03752023-05-0113553610.3390/membranes13050536A Facile Way to Fabricate GO-EDA/Al<sub>2</sub>O<sub>3</sub> Tubular Nanofiltration Membranes with Enhanced Desalination Stability via Fine-Tuning the pH of the Membrane-Forming SuspensionsChunxiao Ding0Hong Qi1College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, ChinaCollege of Chemical Engineering, Nanjing Tech University, Nanjing 210009, ChinaPristine graphene oxide (GO)-based membranes have proven promising for molecular and ion separation owing to efficient molecular transport nanochannels, but their separation ability in an aqueous environment is limited by the natural swelling tendency of GO. To obtain a novel membrane with anti-swelling behavior and remarkable desalination capability, we used the Al<sub>2</sub>O<sub>3</sub> tubular membrane with an average pore size of 20 nm as the substrate and fabricated several GO nanofiltration ceramic membranes with different interlayer structures and surface charges by fine-tuning the pH of the GO-EDA membrane-forming suspension (pH = 7, 9, 11). The resultant membranes could maintain desalination stability, whether immersed in water for 680 h or operated under a high-pressure environment. When the pH of the membrane-forming suspension was 11, the prepared GE-11 membrane showed a rejection of 91.5% (measured at 5 bar) towards 1 mM Na<sub>2</sub>SO<sub>4</sub> after soaking in water for 680 h. An increase in the transmembrane pressure to 20 bar resulted in an increase in the rejection towards the 1 mM Na<sub>2</sub>SO<sub>4</sub> solution to 96.3%, and an increase in the permeance to 3.7 L·m<sup>−2</sup>·h<sup>−1</sup>·bar<sup>−1</sup>. The proposed strategy in varying charge repulsion is beneficial to the future development of GO-derived nanofiltration ceramic membranes.https://www.mdpi.com/2077-0375/13/5/536graphene oxide membraneAl<sub>2</sub>O<sub>3</sub> tubular membranesdesalination stabilitysalt rejection |
| spellingShingle | Chunxiao Ding Hong Qi A Facile Way to Fabricate GO-EDA/Al<sub>2</sub>O<sub>3</sub> Tubular Nanofiltration Membranes with Enhanced Desalination Stability via Fine-Tuning the pH of the Membrane-Forming Suspensions Membranes graphene oxide membrane Al<sub>2</sub>O<sub>3</sub> tubular membranes desalination stability salt rejection |
| title | A Facile Way to Fabricate GO-EDA/Al<sub>2</sub>O<sub>3</sub> Tubular Nanofiltration Membranes with Enhanced Desalination Stability via Fine-Tuning the pH of the Membrane-Forming Suspensions |
| title_full | A Facile Way to Fabricate GO-EDA/Al<sub>2</sub>O<sub>3</sub> Tubular Nanofiltration Membranes with Enhanced Desalination Stability via Fine-Tuning the pH of the Membrane-Forming Suspensions |
| title_fullStr | A Facile Way to Fabricate GO-EDA/Al<sub>2</sub>O<sub>3</sub> Tubular Nanofiltration Membranes with Enhanced Desalination Stability via Fine-Tuning the pH of the Membrane-Forming Suspensions |
| title_full_unstemmed | A Facile Way to Fabricate GO-EDA/Al<sub>2</sub>O<sub>3</sub> Tubular Nanofiltration Membranes with Enhanced Desalination Stability via Fine-Tuning the pH of the Membrane-Forming Suspensions |
| title_short | A Facile Way to Fabricate GO-EDA/Al<sub>2</sub>O<sub>3</sub> Tubular Nanofiltration Membranes with Enhanced Desalination Stability via Fine-Tuning the pH of the Membrane-Forming Suspensions |
| title_sort | facile way to fabricate go eda al sub 2 sub o sub 3 sub tubular nanofiltration membranes with enhanced desalination stability via fine tuning the ph of the membrane forming suspensions |
| topic | graphene oxide membrane Al<sub>2</sub>O<sub>3</sub> tubular membranes desalination stability salt rejection |
| url | https://www.mdpi.com/2077-0375/13/5/536 |
| work_keys_str_mv | AT chunxiaoding afacilewaytofabricategoedaalsub2subosub3subtubularnanofiltrationmembraneswithenhanceddesalinationstabilityviafinetuningthephofthemembraneformingsuspensions AT hongqi afacilewaytofabricategoedaalsub2subosub3subtubularnanofiltrationmembraneswithenhanceddesalinationstabilityviafinetuningthephofthemembraneformingsuspensions AT chunxiaoding facilewaytofabricategoedaalsub2subosub3subtubularnanofiltrationmembraneswithenhanceddesalinationstabilityviafinetuningthephofthemembraneformingsuspensions AT hongqi facilewaytofabricategoedaalsub2subosub3subtubularnanofiltrationmembraneswithenhanceddesalinationstabilityviafinetuningthephofthemembraneformingsuspensions |