【摘要】 壳聚糖对许多物质具有螯合吸附作用。通过化学改性可在壳聚糖分子中引入各种功能团，生成各种具有不同性能的壳聚糖衍生物，从而扩大壳聚糖的应用范围。实验制备了酰化壳聚糖交联微球，研究其对Ni²⁺的吸附性能。从SEM图可以看出，酰化壳聚糖成球性状良好。吸附实验结果显示，在pH=7.0、t=60 min、加入量为0.07 g条件下对初始浓度为20 mg/L的Ni²⁺溶液吸附效果最好。热力学研究结果显示，酰化壳聚糖交联微球对Ni²⁺的吸附过程为吸热过程，且吸附是自发进行的。动力学研究结果显示，吸附过程可以用准二级动力学方程描述（R²>0.99）。吸附过程不仅存在材料内外表面对于Ni²⁺的物理吸附作用控制，还受表面含氧官能团的化学吸附作用控制。更多还原

【Abstract】 Chitosan exhibits chelating and adsorption properties for many substances. Through chemical modification, various functional groups can be introduced into chitosan molecules, resulting in chitosan derivatives with different properties, thereby broadening the scope of its applications. In this study, acylated chitosan cross-linked microspheres were prepared to investigate their adsorption properties for Ni²⁺. Scanning electron microscopy（SEM） images indicate that the acylated chitosan microspheres have a well-formed spherical structure. The results of the adsorption experiments show that the optimal adsorption of Ni²⁺ occurred under the conditions of pH=7.0, a contact time of 60 minutes, and an adsorbent dosage of 0.07 g for a Ni²⁺ solution with an initial concentration of 20 mg/L. Thermodynamic studies indicate that the adsorption process of Ni²⁺ onto the acylated chitosan cross-linked microspheres is endothermic and spontaneous. Kinetic studies reveal that the adsorption process follows a pseudo-second-order kinetic model（R²>0.99）. The adsorption process is controlled not only by the physical adsorption of Ni²⁺ on the internal and external surfaces of the material but also by the chemical adsorption involving oxygen-containing functional groups on the surface.更多还原