The development of adsorbents with outstanding adsorption capacities, wide versatility, and excellent recyclability for the removal of organic dyes remains a challenge. In this study, a quaternised chitosan-based aerogel (QCSA) was fabricated via a facile method to effectively treat concomitant anionic dyes. Porous QCSA with high hydrophilicity, nontoxicity, excellent thermal stability, and sustainability exhibits adsorption properties superior to most previously reported adsorbents. The equilibrium adsorption capacities for Congo red, Sunset yellow, and Methyl orange were 1259.6, 550.2, and 607.5 mg/g, respectively. Notably, the spent QCSA exhibits excellent cyclic performance. The multilayer adsorption, external–internal mass transfer resistance, and adsorption on the active site models were employed to enable a more accurate description of the dynamic characteristics, confirming that double-layer chemisorption was the dominant process. A quantitative analysis of the electrostatic potential and the independent gradient model further verified that electrostatic interactions, hydrogen bonding, and van der Waals forces led to the highly efficient adsorption of dye molecules. Therefore, the eco-friendly and recyclable QCSA is a promising adsorbent for trapping anionic dyes from aquatic systems.

开发具有出色吸附能力、广泛通用性和出色可回收性的吸附剂以去除有机染料仍然是一个挑战。在这项研究中，通过一种简便的方法制备了季铵化壳聚糖基气凝胶 (QCSA)，以有效处理伴随的阴离子染料。具有高亲水性、无毒性、优异的热稳定性和可持续性的多孔 QCSA 表现出优于大多数先前报道的吸附剂的吸附性能。刚果红、日落黄和甲基橙的平衡吸附容量分别为 1259.6、550.2 和 607.5 mg/g。值得注意的是，用过的 QCSA 表现出出色的循环性能。多层吸附，外部 - 内部传质阻力和活性位点吸附模型被用来更准确地描述动态特性，证实双层化学吸附是主要过程。静电势和独立梯度模型的定量分析进一步证实了静电相互作用、氢键和范德华力导致染料分子的高效吸附。因此，环保且可回收的 QCSA 是一种很有前途的吸附剂，可用于捕获水生系统中的阴离子染料。