Graphene oxide as efficient high-concentration formaldehyde scavenger and reutilization in supercapacitor

Area of Science:

• Materials Science
• Environmental Chemistry
• Electrochemistry

Background:

• Formaldehyde is a common indoor air pollutant.
• Effective and sustainable methods for formaldehyde removal are needed.
• Graphene oxide (GO) is a promising material for adsorption applications.

Purpose of the Study:

• To investigate graphene oxide (GO) as a scavenger for high-concentration formaldehyde in alkaline media.
• To explore the regeneration of used GO and its potential for energy storage.
• To elucidate the formaldehyde degradation mechanism by GO.

Main Methods:

• Adsorption experiments with GO and formaldehyde in alkali media.
• Electrochemical characterization of GO before and after formaldehyde adsorption.
• Analysis of compositional changes using characterization techniques.

Main Results:

• GO demonstrated a high formaldehyde removal capacity (411 mg/g) with temperature resistance.
• Used GO (reduced GO, rGO) was regenerated electrochemically.
• Formaldehyde degradation involved chemical oxidation (dominant) and physical adsorption.
• Regenerated rGO showed enhanced electrical double-layer capacitor (EDLC) properties and high capacitance (136 F/g at 50 A/g).

Conclusions:

• Graphene oxide is a highly efficient and renewable formaldehyde scavenger.
• The spent GO (rGO) is a viable material for electrical energy storage.
• This study offers a sustainable approach for reusing adsorbents from environmental remediation.