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Reduction of graphene oxide/alginate composite hydrogels for enhanced adsorption of hydrophobic compounds

机译：还原氧化石墨烯/藻酸盐复合水凝胶以增强疏水性化合物的吸附

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摘要

Carbon-based materials, consisting of graphene oxide (GO) or reduced GO (rGO), possess unique abilities to interact with various molecules. In particular, rGO materials hold great promise for adsorption and delivery applications of hydrophobic molecules. However, conventional production and/or usage of rGO in aqueous solution often causes severe aggregation due to its low water solubility and thus difficulties in handling and applications. In our study, to prevent the severe aggregation of GO during reduction and to achieve a high adsorption capacity with hydrophobic compounds, GO/alginate composite hydrogels were first prepared and then reduced in an aqueous ascorbic acid solution at 37 degrees C. Adsorption studies with a model hydrophobic substance, rhodamine B, revealed that the reduced composite hydrogels are more highly absorbent than the unreduced hydrogels. In addition, the adsorption properties of the composite hydrogels, which are consequences of hydrophobic and ionic interactions, could be modulated by controlling the degree of reduction for the adsorption of different molecules. The composite hydrogels embedding rGO can be very useful in applications related to drug delivery, waste treatment, and biosensing.
机译：由氧化石墨烯（GO）或还原GO（rGO）组成的碳基材料具有与各种分子相互作用的独特能力。特别是，rGO材料在疏水分子的吸附和输送应用方面具有广阔的前景。然而，由于rGO的低水溶性，rGO在水溶液中的常规生产和/或使用经常引起严重的聚集，因此难以处理和应用。在我们的研究中，为防止还原过程中GO的严重聚集并获得疏水性化合物的高吸附能力，首先制备了GO /藻酸盐复合水凝胶，然后在抗坏血酸水溶液中于37℃还原。模型疏水物质罗丹明B揭示还原的复合水凝胶比未还原的水凝胶具有更高的吸收性。另外，复合水凝胶的吸附性质是疏水和离子相互作用的结果，可以通过控制不同分子吸附的还原程度来调节。嵌入rGO的复合水凝胶在与药物输送，废物处理和生物传感有关的应用中非常有用。

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