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Self-propagating solar light reduction of graphite oxide in water

机译：自蔓延的太阳光还原水中的氧化石墨

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Graphite Oxide (GtO) is commonly used as an intermediate material for preparation of graphene in the form of reduced graphene oxide (rGO). Being a semiconductor with tunable band gap rGO is often coupled with various photocatalysts to enhance their visible light activity. The behavior of such rGO-based composites could be affected after prolonged exposure to solar light. In the present work, the alteration of the GtO properties under solar light irradiation is investigated. Water dispersions of GtO manufactured by oxidation of natural graphite via Hummers method were irradiated into solar light simulator for different periods of time without addition of catalysts or reductive agent. The FT-IR analysis of the treated dispersions revealed gradual reduction of the GtO with the increase of the irradiation time. The XRD, FT-IR and XPS analyses of the obtained solid materials confirmed the transition of GtO to rGO under solar light irradiation. The reduction of the GtO was also manifested by the CV measurements that revealed stepwise increase of the specific capacitance connected with the restoration of the sp(2) domains. Photothermal self propagating reduction of graphene oxide in aqueous media under solar light irradiation is suggested as a possible mechanism. The self-photoreduction of GtO utilizing solar light provides a green, sustainable route towards preparation of reduced graphene oxide. However, the instability of the GtO and partially reduced GO under irradiation should be considered when choosing the field of its application. (C) 2016 Elsevier B.V. All rights reserved.
机译：氧化石墨（GtO）通常用作还原石墨烯（rGO）形式制备石墨烯的中间材料。作为具有可调带隙的半导体，rGO通常与各种光催化剂结合使用，以增强其可见光活性。长时间暴露于阳光下，此类基于rGO的复合材料的性能可能会受到影响。在目前的工作中，研究了日光照射下GtO性质的变化。在不添加催化剂或还原剂的情况下，将通过Hummers方法将天然石墨氧化制得的GtO的水分散体照射到太阳光模拟器中不同的时间。经处理的分散体的FT-IR分析表明，随着照射时间的增加，GtO逐渐降低。所得固体材料的XRD，FT-IR和XPS分析证实了在太阳光照射下GtO向rGO的转变。 GtO的降低还通过CV测量得到证实，CV测量揭示了与sp（2）域的恢复相关的比电容的逐步增加。有人提出在日光照射下水介质中氧化石墨烯的光热自蔓延还原是可能的机理。利用太阳光对GtO进行自光还原，为制备还原型氧化石墨烯提供了绿色，可持续的途径。但是，在选择其应用领域时，应考虑GtO的不稳定性和在照射下GO的部分还原。 （C）2016 Elsevier B.V.保留所有权利。

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