DOI: https://doi.org/10.55373/mjchem.v26i3.127

Keywords: Graphene nanoplatelets; surface modification; acid treatment; oxygen functionalization; optimization

Abstract

Graphene is an ideal platform for adsorbent applications, for which chemical modification plays a key role. In this work, we focus on enhancing the surface properties of Graphene Nanoplatelets (GNPs), renowned for their exceptional structural integrity and high hydrophobicity, and broadening their applicability. Our study adopts a straightforward method to modify the surface of GNPs by utilizing a mixture of Nitric Acid (HNO3) and Sulfuric Acid (H2SO4). To maximize the incorporation of oxygen functionality, we devised a reflux-based acid treatment strategy aimed at optimizing the surface modification of GNPs through oxidation by HNO3 and H2SO4. The attachment of oxygen-containing functional groups onto the GNPs was assessed through Fourier Transform Infrared Spectroscopy (FTIR). We successfully identified the optimal conditions for this functionalization process, achieving a HNO3 to H2SO4 ratio of 1:1, an acid concentration of 7 M, and a contact time of 16 hours.