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Fast Identification and Quantification of Graphene Oxide in Aqueous Environment by Raman Spectroscopy

College of Chemistry and Environment Protection Engineering, Southwest Minzu University, Chengdu 610041, China
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Nanomaterials 2020, 10(4), 770; https://doi.org/10.3390/nano10040770
Received: 24 March 2020 / Revised: 11 April 2020 / Accepted: 12 April 2020 / Published: 16 April 2020
Today, graphene nanomaterials are produced on a large-scale and applied in various areas. The toxicity and hazards of graphene materials have aroused great concerns, in which the detection and quantification of graphene are essential for environmental risk evaluations. In this study, we developed a fast identification and quantification method for graphene oxide (GO) in aqueous environments using Raman spectroscopy. GO was chemically reduced by hydrazine hydrate to form partially reduced GO (PRGO), where the fluorescence from GO was largely reduced, and the Raman signals (G band and D band) were dominating. According to the Raman characteristics, GO was easily be distinguished from other carbon nanomaterials in aqueous environments, such as carbon nanotubes, fullerene and carbon nanoparticles. The GO concentration was quantified in the range of 0.001–0.6 mg/mL with good linearity. Using our technique, we did not find any GO in local water samples. The transport of GO dispersion in quartz sands was successfully quantified. Our results indicated that GO was conveniently quantified by Raman spectroscopy after partial reduction. The potential applications of our technique in the environmental risk evaluations of graphene materials are discussed further. View Full-Text
Keywords: graphene; Raman spectroscopy; chemical reduction; environmental analysis; nano-biosafety graphene; Raman spectroscopy; chemical reduction; environmental analysis; nano-biosafety
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MDPI and ACS Style

Yang, S.; Chen, Q.; Shi, M.; Zhang, Q.; Lan, S.; Maimaiti, T.; Li, Q.; Ouyang, P.; Tang, K.; Yang, S.-T. Fast Identification and Quantification of Graphene Oxide in Aqueous Environment by Raman Spectroscopy. Nanomaterials 2020, 10, 770.

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