This work investigates the adsorption characteristics and mechanisms of immobilized chitosan-montmorillonite (CS-MT) composite for the removal of methyl orange (MO) dye. It was observed that the immobilized CS-MT has a rougher surface, lower swelling, higher adhesion strength and higher surface area than the immobilized CS. The adsorption of MO dye onto the immobilized CS-MT followed the pseudo-second-order kinetic model, whereas at equilibrium, the Langmuir model best described the MO adsorption. The maximum adsorption capacity, q_m of the immobilized CS-MT at 30, 45 and 60 °C were 154.4, 82.8 and 64.9 mg g⁻¹, respectively. The thermodynamic study showed that the process of MO adsorption onto the immobilized CS-MT was exothermic in nature. The main adsorption mechanism of MO dye on immobilized CS-MT can be assigned to electrostatic attractions, n–π stacking interaction, dipole–dipole hydrogen bonding interactions and Yoshida H-bonding. Overall, the immobilized CS-MT does not only offer relatively high adsorption capacity, but also facilitates the treatment operation reusability and easy recovery of the adsorbent.

这项工作研究固定化的壳聚糖-蒙脱土（CS-MT）复合材料的吸附特性和机理，以去除甲基橙（MO）染料。观察到固定化的CS-MT比固定化的CS具有更粗糙的表面，更低的溶胀，更高的粘合强度和更大的表面积。MO染料在固定化CS-MT上的吸附遵循伪二级动力学模型，而在平衡状态下，Langmuir模型最能描述MO的吸附。固定化CS-MT在30、45和60°C时的最大吸附容量q _m为154.4、82.8和64.9 mg g ^-1， 分别。热力学研究表明，MO吸附在固定化CS-MT上的过程本质上是放热的。MO染料在固定化CS-MT上的主要吸附机理可归因于静电引力，n-π堆积相互作用，偶极-偶极氢键相互作用和吉田H键。总体而言，固定化的CS-MT不仅提供相对较高的吸附能力，而且还促进了处理操作的可重复使用性和吸附剂的易于回收。