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Synergetic mediation of reduced graphene oxide and Cu(II) on the oxidation of 2-naphthol in water
- Source :
- Environmental Pollution. 252:689-696
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Reduced graphene oxide (rGO) is one of the most widely used carbon nanomaterials. When it is released into the environment, rGO can markedly affect the transformation of many pollutants, and change their fate and risk. In this work, the synergetic effects of rGO and Cu(II) on the oxidation of 2-naphthol were examined in water in the dark. It was found that the coexistence of rGO and Cu(II) significantly promoted the oxidation of 2-naphthol. Corresponding products were identified as the coupling oligomers of 2-naphthol (dimer, trimer and tetramer) and hydroxylated compounds (OH-2-naphthol, OH-dimer, di–OH–dimer and naphthoquinone derivatives). In the oxidation reaction, rGO played dual roles, i.e. adsorbent and electron-transfer mediator. rGO firstly adsorbed Cu(II) and 2-naphthol on its surface, and then transferred electrons from 2-naphthol to Cu(II) to yield 2-naphthol radicals and Cu(I). 2-Naphthol radicals coupled to each other to form different oligomers of 2-naphthol. Cu(I) was re-oxidized back to Cu(II) by dissolved oxygen, which sustained the continuous oxidation of 2-naphthol. During the autoxidation of Cu(I), reactive oxygen species were generated, which further reacted with 2-naphthol to form hydroxylated products. These findings provide new insights into the risk assessment of rGO and 2-naphthol in aquatic environments.
- Subjects :
- 010504 meteorology & atmospheric sciences
Health, Toxicology and Mutagenesis
Radical
Oxide
Trimer
Naphthols
010501 environmental sciences
Toxicology
Photochemistry
01 natural sciences
Redox
law.invention
chemistry.chemical_compound
Adsorption
law
Environmental Restoration and Remediation
0105 earth and related environmental sciences
Autoxidation
Graphene
Water
General Medicine
Pollution
Nanostructures
chemistry
Graphite
Reactive Oxygen Species
Oxidation-Reduction
2-Naphthol
Copper
Water Pollutants, Chemical
Subjects
Details
- ISSN :
- 02697491
- Volume :
- 252
- Database :
- OpenAIRE
- Journal :
- Environmental Pollution
- Accession number :
- edsair.doi.dedup.....ba8abe9afc1e91f6783445ac57132bf2