Related Experiment Video
Updated: Jun 6, 2025
Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
Published on: August 16, 2018
Nanoconfined electrostatic interaction for efficient anion sieving in graphene oxide membranes
Shuai Wang1, Yi Huang2, Yu Qiang3
1MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China; School of Physics, East China University of Science and Technology, Shanghai, 200237, China; Center for Healthcare Materials, Shaoxing Institute, Zhejiang University, Shaoxing 312000, China.
This study developed advanced 2D membranes from modified graphene oxide (GO) for precise ion sieving in water treatment. The new membranes offer superior selectivity for chloride/sulfate separation, improving water purification and resource recovery.
Area of Science:
- Materials Science
- Nanotechnology
- Environmental Science
Background:
- Precise ion sieving is vital for water treatment and resource recovery.
- Graphene oxide (GO) 2D materials offer tunable nanochannels for membranes.
- Swollen GO interlayer spacing in water hinders selective ion sieving.
Purpose of the Study:
- To develop a 2D nanochannel membrane with controllable ion transport and precise ion sieving.
- To overcome the challenge of enlarged interlayer spacing in GO membranes.
- To achieve efficient and accurate chloride/sulfate separation.
Main Methods:
- Reforming graphene oxide (GO) nanosheets via physical reduction.
- Modifying GO nanosheets with negatively charged molecule chains.
- Simultaneously controlling nanochannel sizes and membrane electronegativity.
Main Results:
- Constructed a 2D nanochannel membrane with fast permeability and high efficiency.
- Achieved accurate Cl-/SO42- separation with 91.83% selectivity.
- Demonstrated a Cl- permeation rate of 1.03 mol m-2h-1, surpassing existing membranes.
Conclusions:
- Interlayer spacing and electrification of 2D nanochannels are key to ion sieving performance.
- Synergistic control of nanochannel size and charge enables precise ion manipulation.
- This work advances understanding of ion separation mechanisms and nanochannel design for water treatment.
More Related Videos
10:27Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte
Published on: October 5, 2017
07:51Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
Published on: February 1, 2022