Polydopamine (PDA) and polyethylenimine (PEI) co-functionalized graphene oxide (GO) aerogel (PPGA) is rapidly synthesized at room temperature by a facile method. Glutaraldehyde acting as crosslinking agent accelerates rapid crosslinking of PDA-coated GO sheets with PEI, and three-dimensional hydrogel is formed within 3 min. The structure of PPGA is characterized by Field emission scanning electron microscope, Fourier transform infrared spectra, X-ray photoelectron spectroscopy, and zeta potential analysis. The obtained PPGA shows efficient adsorption toward anionic dyes (202.8 mg/g for Methyl orange and 196.7 mg/g for Amaranth) and organic solvents. Furthermore, the dye adsorption behaviors, including kinetics, isotherms, and thermodynamics, are systematically investigated. The adsorption process of methyl orange onto PPGA can be well depicted with the pseudo-second-order kinetic model and Langmuir isotherm model. Thermodynamic analysis shows that the adsorption is a spontaneous and endothermic process of entropy increment. Adsorption mechanism indicates that the removal of dye is mainly attributed to the hydrogen bonding between hydrogen atoms of nitrogen-containing functional groups in PPGA and oxygen atoms of anionic dye. The adsorption capacity for the chosen organic solvents ranges from 28.7 to 63.5 mg/mg depending on the densities of the solvents. This work may provide an inspiration for the researchers who are devoted to rapid fabrication of hydrogels with excellent adsorption ability.

聚多巴胺（PDA）和聚乙烯亚胺（PEI）共官能化的氧化石墨烯（GO）气凝胶（PPGA）可以在室温下通过简便的方法快速合成。戊二醛作为交联剂，可加速PDA涂层的GO片材与PEI的快速交联，并在3分钟内形成三维水凝胶。PPGA的结构通过场发射扫描电子显微镜，傅立叶变换红外光谱，X射线光电子能谱和ζ电势分析来表征。所得的PPGA显示出对阴离子染料（甲基橙为202.8 mg / g，A菜为196.7 mg / g）和有机溶剂的有效吸附。此外，系统地研究了染料的吸附行为，包括动力学，等温线和热力学。用伪二级动力学模型和Langmuir等温线模型可以很好地描述甲基橙在PPGA上的吸附过程。热力学分析表明，吸附是熵增加的自发和吸热过程。吸附机理表明，染料的去除主要归因于PPGA中含氮官能团的氢原子与阴离子染料的氧原子之间的氢键。根据溶剂的密度，所选有机溶剂的吸附容量范围为28.7至63.5 mg / mg。这项工作可能为致力于快速制备具有出色吸附能力的水凝胶的研究人员提供灵感。热力学分析表明，吸附是熵增加的自发和吸热过程。吸附机理表明，染料的去除主要归因于PPGA中含氮官能团的氢原子与阴离子染料的氧原子之间的氢键。所选择的有机溶剂的吸附能力取决于溶剂的密度，范围为28.7至63.5 mg / mg。这项工作可能为致力于快速制备具有出色吸附能力的水凝胶的研究人员提供灵感。热力学分析表明，吸附是熵增加的自发和吸热过程。吸附机理表明，染料的去除主要归因于PPGA中含氮官能团的氢原子与阴离子染料的氧原子之间的氢键。根据溶剂的密度，所选有机溶剂的吸附容量范围为28.7至63.5 mg / mg。这项工作可能为致力于快速制备具有出色吸附能力的水凝胶的研究人员提供灵感。所选择的有机溶剂的吸附能力取决于溶剂的密度，范围为28.7至63.5 mg / mg。这项工作可能为致力于快速制备具有出色吸附能力的水凝胶的研究人员提供灵感。根据溶剂的密度，所选有机溶剂的吸附容量范围为28.7至63.5 mg / mg。这项工作可能为致力于快速制备具有出色吸附能力的水凝胶的研究人员提供灵感。