Related Experiment Video
Updated: Oct 30, 2025
07:51
Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
Published on: February 1, 2022
3.5K
Size-Dependent Ion Adsorption in Graphene Oxide Membranes
Xiaoheng Jin1, Xinyue Wen1, Sean Lim2
1School of Materials Science and Engineering, University of New South Wales (UNSW), Sydney, NSW 2052, Australia.
Nanomaterials (Basel, Switzerland)
|July 2, 2021
Summary
Graphene oxide (GO) membranes precisely control ion adsorption by tuning interlayer spacing. This enables size-selective removal of contaminants from water, enhancing purification applications.
Area of Science:
- Materials Science
- Environmental Science
- Nanotechnology
Background:
- Graphene oxide (GO) is amphiphilic, enabling contaminant removal from water.
- GO-based materials show potential for water purification and adsorption applications.
Purpose of the Study:
- To demonstrate size-selective ion adsorption in GO-based laminates.
- To investigate the precise tuning of GO membrane interlayer spacing for contaminant removal.
Main Methods:
- GO membranes were prepared using a controlled method.
- Interlayer spacing was tuned using cationic control solutions and small salt ion intercalation (K+, Na+, Cl-).
- Weight uptake of larger ions ([Fe(CN)6]4-, [Fe(CN)6]3-) was measured to determine adsorption.
Main Results:
- Tuning interlayer spacing precisely controlled the entry of larger ions.
- Adsorption occurred within membranes when nanocapillary openings exceeded hydrated ion diameters.
- Surface sorption occurred when nanocapillary openings were too small for ion entrance.
Conclusions:
- GO-based laminates offer tunable size-selective ion adsorption.
- Precise control over GO membrane nanostructure enables targeted contaminant removal.
- This approach advances GO applications in water purification and environmental remediation.
Related Concept Videos
01:15Potentiometry: Membrane Electrodes
972
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
972
01:09Analyte Adsorption and Distribution
1.3K
In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
1.3K