A liquid-phase exfoliation of few-layer graphene in tea is considered as one of the alternative approaches for the preparation of environment-friendly graphene. However, the removal of chemically adsorbed tea-polyphenols from graphene is known to be difficult and the application of centrifugation or filtration alone for the purification of graphene against tea-polyphenols is regarded to be almost technically impossible. Notably, a strategy for facile deoxygenation of tea-graphene must be established for a green and economical production of graphene to be realized. In this work, a simple purification method of graphene through the application of merely a household bleach (Clorox^®) after the pre-exfoliation in black tea has been proposed. It has been found that the carbon–oxygen (C/O) value for graphene increases from 2.7 to 8.1 while the values of C–OH, C–O–C and C=O region in the C1s spectrum of graphene decrease significantly after being purified in bleach for 5 h. The stretching and shift of C–OH, C=O and C–O–C at 3468 cm⁻¹, 1637 cm⁻¹ and 1008 cm⁻¹ from IR spectrum of purified graphene seems to be in agreement with the produced data from the XPS and Raman spectroscopy. Despite the enhanced I_D/I_G of Raman from the hybridization of sp² by hydroxylation, the deoxygenation of tea-graphene does not negatively affect the electrical performance since the sheet resistance was impressively reduced to 193 Ω from 2.1 kΩ. It is believed that this photo-Fenton-inspired purification strategy would assist in the washing issue of polyphenol-stabilized graphene for various future electronic applications.

中文翻译：

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光芬顿激发的家用漂白剂对茶多酚-石墨烯的脱氧

茶中几层石墨烯的液相剥落被认为是制备环保石墨烯的替代方法之一。然而，已知从石墨烯中去除化学吸附的茶多酚是困难的，并且仅将离心或过滤用于纯化针对茶多酚的石墨烯被认为在技术上几乎是不可能的。值得注意的是，必须建立茶石墨烯的容易的脱氧策略，以实现绿色和经济的石墨烯生产。在这项工作中，通过仅仅一个家用漂白剂的应用的石墨烯的一个简单的纯化方法（次氯酸钠^®）建议在红茶中预先去角质之后。已经发现，石墨烯的碳-氧（C / O）值从2.7增加到8.1，而石墨烯的C1s光谱中的C-OH，C-OC和C = O区域的值显着降低。在漂白剂中纯化5小时。在3468厘米的C-OH，C = O和C-O-C的拉伸和移^-1，1637厘米^-1和1008厘米^-1从纯化的石墨烯的IR光谱似乎是在协议与来自所产生的数据XPS和拉曼光谱。尽管sp ²的杂交增强了拉曼的I _D / I _G通过羟基化，茶石墨烯的脱氧不会对电气性能产生负面影响，因为薄层电阻从2.1kΩ显着降低至193Ω。据信，这种受光芬顿启发的纯化策略将有助于多酚稳定的石墨烯在各种未来电子应用中的洗涤问题。