Noncovalent Interaction with Graphene Oxide: The Crucial Role of Oxidative Debris

Autor(es)

Coluci, Vitor R. ^[1] ; Martinez, Diego Stefani T. ^[2] ; Honorio, Jaqueline G. ^[1] ; de Faria, Andreia F. ^[2] ; Morales, Daniel A. ^[1] ; Skaf, Munir S. ^[3] ; Alves, Oswaldo L. ^[2] ; Umbuzeiro, Gisela A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Campinas UNICAMP, Sch Technol, BR-13484332 Limeira, SP - Brazil

^[2] Univ Campinas UNICAMP, Inst Chem, Solid State Chem Lab, BR-13081970 Campinas, SP - Brazil

^[3] Univ Campinas UNICAMP, Inst Chem, BR-13084862 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Physical Chemistry C; v. 118, n. 4, p. 2187-2193, JAN 30 2014.
• Citações Web of Science: 36

Resumo

Graphene oxide (GO) is a very promising material because it is easy to process, water-soluble, and chemically versatile due to the presence of oxygenated groups on its surface. GO has been used in different areas such as electronics, biosensing, and environmental remediation. To design efficient materials, especially for biosensing and for remediating pollutants, the knowledge of surface noncovalent interaction and functionalization is crucial. Recently, it has been suggested revisions on the structural models of GO because the presence of highly oxidized polyaromatic carboxylated fragments (oxidative debris) on the GO surfaces. These debris are produced during acid treatments commonly employed in GO synthesis and purification. Here we applied chemical analysis, bioassays, and atomistic simulations to study the influence of oxidative debris on the noncovalent interaction of GO sheets with an important organic pollutant (e.g., 1-nitropyrene). GO samples without oxidative debris were found to be 75% more effective to adsorb 1-nitropyrene than samples with debris. Our results suggest that small (similar to 1 nm) oxidative debris are responsible for preventing adsorption sites on GO surfaces from being reached by potentially adsorbate molecules. (AU)

• Processo FAPESP: 13/13640-8 - Influência de resíduos superficiais na adsorção de poluentes ambientais em óxido de grafeno
• Beneficiário: Vitor Rafael Coluci
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 10/50646-6 - Aplicação de computação de alto desempenho em problemas interdisciplinares
• Beneficiário: Vitor Rafael Coluci
• Modalidade de apoio: Auxílio à Pesquisa - Regular