A novel supramolecular hydrogel (GQDs-GSH), generated from self-assembly between the reduced graphene oxide (RGO) and in-situ formed graphene quantum dots (GQDs), was fabricated by using one-step hydrothermal route. In the hydrogel, the GQDs clusters that produced by the aggregation of GQDs acted as the good cross-linkers, pillars and surface stabilizers to bind RGO building blocks via multiple hydrogen bonding to construct interconnected 3D porous network. Otherwise, the as-prepared hydrogel exhibited special pH-responsive on-off switchable fluorescence behavior, which means that the reversible process referred to stripping and reloading of GQDs in the hydrogel was regulated by the pH stimulation. Sequentially, GQDs-GSH was applied for U(VI) detection with a good linear relationship (R² = 0.999) and high selectivity, followed by effective U(VI) removal and feasible GQDs recovery from aqueous solution. These exciting findings reveal good promises of GQDs for the preparation of 3D architectures and provide a potential platform for integrated detection and treatment of pollutants.

采用一步水热法制备了一种新型超分子水凝胶（GQDs-GSH），由还原氧化石墨烯（RGO）和原位形成的石墨烯量子点（GQDs）之间的自组装产生。在水凝胶中，由GQDs聚集产生的GQDs簇作为良好的交联剂、支柱和表面稳定剂，通过多个氢键结合RGO构件，构建相互连接的3D多孔网络。否则，所制备的水凝胶表现出特殊的 pH 响应开关可切换荧光行为，这意味着水凝胶中 GQD 的剥离和重新加载的可逆过程受 pH 刺激的调节。随后，GQDs-GSH 被应用于 U(VI) 检测，具有良好的线性关系 (R ² = 0.999）和高选择性，其次是有效的 U（VI）去除和可行的 GQDs 从水溶液中回收。这些令人兴奋的发现揭示了 GQD 在制备 3D 架构方面的良好前景，并为污染物的综合检测和处理提供了潜在平台。