Selective adsorption and decomposition of pollutants using RGO-TiO₂ with optimized surface functional groups.

Area of Science:

• Materials Science
• Environmental Chemistry
• Nanotechnology

Background:

• Pollution removal is a critical environmental challenge.
• Graphene oxide (GO) and titanium dioxide (TiO2) are promising materials for environmental remediation.
• Tailoring surface functional groups on reduced graphene oxide (RGO) can enhance its properties.

Purpose of the Study:

• To synthesize and characterize RGO-TiO2 composites with optimized surface functional groups.
• To investigate the selective adsorption and photocatalytic degradation of pollutants by these composites.
• To understand the role of RGO surface functional groups in the composite's performance.

Main Methods:

• Synthesis of RGO-TiO2 composites with varying functional groups.
• Characterization using electron paramagnetic resonance (EPR) and infrared spectroscopy (IR).
• Photocatalytic degradation experiments using rhodamine-B and phenol under UV and visible light.

Main Results:

• Composites with high hydroxyl groups effectively adsorbed and decomposed rhodamine-B.
• Composites with high carboxyl groups excelled in adsorbing and decomposing phenol.
• Carboxyl groups on RGO edges facilitated strong chemical bonding with TiO2, confirmed by EPR and IR.
• The RGO-TiO2 composites exhibited excellent photocatalytic activity under both UV and visible light.

Conclusions:

• The surface functionalization of RGO is crucial for developing effective RGO-TiO2 composite photocatalysts.
• Tailoring the RGO surface allows for selective pollutant adsorption and degradation.
• These engineered composites show significant potential for environmental remediation applications.