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In Situ Tracking Photodegradation of Trace Graphene Oxide by the Online Coupling of Photoinduced Chemical Vapor Generation with a Point Discharge Optical Emission Spectrometer
journal contribution
posted on 2019-12-24, 21:29 authored by Zhiqiang Tan, Bowen Wang, Yongguang Yin, Qian Liu, Xia Li, Jingfu LiuThe photostability of graphene oxide (GO) strongly affects
the
performance of its products in optics and photonics. However, the
photostability of GO, especially at trace levels, remains largely
unexplored mainly because of the lack of available techniques. Herein,
we developed a novel online system consisting of a highly efficient
photoinduced chemical vapor generation reactor and an in situ measurement
technique using a miniaturized and sensitive point discharge optical
emission spectrometer. On the basis of the results of inorganic carbon
species, abundant oxygen-containing functional groups on GO nanosheets
made the degradation much easier than graphene. Under the optimized
conditions (e.g., initial pH of 2.8 and binary photocatalysts dose
of 200 mM H2O2, 1.0 mM Fe3+ ions,
and 50 mg/L TiO2 NPs), the limit of detection for GO was
87.5 μg/L C with a linear range of 0.5–10 mg/L C. Specifically,
the accuracy and reliability of the developed system was verified
by quantifying self-prepared GO as well as aggregated GO in natural
organic matter-rich water samples. Finally, the sunlight-induced photodegradation
of GO under simulated environmental conditions was successfully tracked.
The developed system is a promising platform for in-time quality control
of GO-based products as well as predicting the occurrence, transformation,
and fate of GO at environmentally relevant concentrations in the natural
aquatic environment.
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in-time quality controlcarbon speciesmatter-rich water samplessunlight-induced photodegradationgraphene oxidetrace levelsPhotoinduced Chemical Vapor Generation200 mM H 2 O 2optimized conditionsphotoinduced chemical vapor generation reactorPoint Discharge Optical Emission Spectrometerquantifying self-preparedNPGO-based productsmeasurement techniquephotostabilitymgemission spectrometerTrace Graphene Oxidepoint dischargeSitu Tracking Photodegradationphotocatalysts dose
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