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Transformation of graphene oxide by ferrous iron: Environmental implications

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Transformation of graphene oxide by ferrous iron: Environmental implications

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Wang, Fanfan Wang, Fang Gao, Guandao Chen, Wei
Description	Country affiliation: China Author Affiliation: Wang F ( College of Environmental Science and Engineering, Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin, China.); Wang F ( College of Environmental Science and Engineering, Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin, China.); Gao G ( College of Environmental Science and Engineering, Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin, China.); Chen W ( College of Environmental Science and Engineering, Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin, China.)
Abstract	Abiotic transformation of graphene oxide (GO) in aquatic environments can markedly affect the fate, transport, and effects of GO. The authors observed that ferrous iron (Fe[II])—an environmentally abundant, mild reductant—can significantly affect the physicochemical properties of GO (examined by treating aqueous GO suspensions with $Fe^{2+}$ at room temperature, with doses of 0.032 mM $Fe^{2+} per mg/L,$ 0.08 mM $Fe^{2+} per mg/L,$ and 0.32 mM $Fe^{2+} per mg/L$ GO). Microscopy data showed stacking of GO nanosheets on $Fe^{2+}$ treatment. Spectroscopy evidence (X-ray diffraction, Fourier transform infrared transmission, Raman and X-ray photoelectron spectroscopy) showed significant changes in GO surface O-functionalities, in terms of loss of epoxy and carbonyl groups but increase of carboxyl group. The reduction mechanisms were verified by treating model organic molecules (styrene oxide, p-benzoquinone, and benzoic acid) resembling O-containing fragments of GO macromolecules with $Fe^{2+}.$ With sedimentation and adsorption experiments (using bisphenol A as a model contaminant), the authors demonstrated that $Fe^{2+}$ reduced GOs still maintained relatively high colloidal stability, whereas their adsorption affinities were significantly enhanced. Thus, reduction of GO by mild reductants might be of greater environmental concerns than by stronger reducing agents (e.g., $N_{2}H_{4}$ and $S^{2–}),$ because the latter can result in too significant losses of surface O-functionalities and colloidal stability of GO. This interesting aspect should be given consideration in the risk assessment of GO. Environ Toxicol Chem 2015;34:1975–1982. © 2015 SETAC
File Format	HTM / HTML
ISSN	07307268
Issue Number	9
Volume Number	34
e-ISSN	15528618
Journal	Environmental Toxicology and Chemistry
Language	English
Publisher	Wiley
Publisher Date	2015-09-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Research Support, Non-u.s. Gov't X-ray Diffraction Discipline Environmental Health Colloids Discipline Toxicology Oxides Nanostructures Spectroscopy, Fourier Transform Infrared Benzoquinones Journal Article Ferrous Compounds Chemistry Adsorption Ultrastructure Styrenes Benzoic Acid Oxidation-reduction Graphite Microscopy, Atomic Force Discipline Chemistry Spectrum Analysis, Raman
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis

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Transformation of graphene oxide by ferrous iron: Environmental implications

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