The stability and adsorption capacity of three-dimensional aerogels (GAs) of graphene oxide (GO) are two important factors that determine its environmental applications. However, enhancement of stability by reduction or crosslinking methods results in the decrease of active sites, thereby impairing the adsorption performance of GAs. Herein, the structure stability and adsorption capacity of GAs were concurrently enhanced by the removal of oxidation debris (OD) nanoparticles from the GO nanosheets. The GA materials of 3D GO and 3D bwGO were fabricated by a freeze-drying approach using GO and base-washed GO (bwGO) as precursors, respectively. The micro/nanostructures in bwGO nanosheets after the removal of OD were created and incorporated into the 3D bwGO aerogel. The structure of 3D bwGO maintained an integrated structure, while the structure of 3D GO collapsed upon hydraulic vibration. The enhanced chemical interaction and physical binding facilitated the adsorption of 3D bwGO for hydrophobic phthalic esters. The increase of the sp² region and carboxyl content, the decrease in the adhered water molecules, and the created wrinkles and folds contributed to the stability and adsorption virtues of 3D bwGO. This study provides insights into the facile fabrication of stable GA with a high adsorption capacity by removing OD nanoparticles from GO nanosheets for environmental applications.

中文翻译：

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通过去除纳米片上的氧化碎屑纳米粒子，同时增强冻干氧化石墨烯气凝胶的结构稳定性和吸附能力

氧化石墨烯（GO）的三维气凝胶（GA）的稳定性和吸附能力是决定其环境应用的两个重要因素。但是，通过还原或交联方法提高稳定性会导致活性位点的减少，从而损害GA的吸附性能。在此，通过从GO纳米片去除氧化碎屑（OD）纳米颗粒，同时提高了GA的结构稳定性和吸附能力。3D GO和3D bwGO的GA材料分别采用GO和碱洗GO（bwGO）作为前体，通过冷冻干燥法制备。在去除OD之后，bwGO纳米片中的微/纳米结构被创建并被整合到3D bwGO气凝胶中。3D bwGO的结构保持了整体结构，而3D GO的结构因液压振动而崩溃。增强的化学相互作用和物理结合促进了3D bwGO对疏水性邻苯二甲酸酯的吸附。sp的增加^2个区域和羧基含量，所附着的水分子减少以及所产生的褶皱和褶皱有助于3D bwGO的稳定性和吸附性。通过从用于环境应用的GO纳米片中去除OD纳米颗粒，本研究提供了洞察稳定的具有高吸附能力的GA的简便方法的见解。