One of the major applications of chitosan is based on its ability to bind ions. In essence, the presence of active hydroxyl groups (-OH) and amino groups (-NH₂), chitosan coordinates easily e.g. with transition metal ions, meanwhile it has a weak adsorption properties towards to alkaline earth metals. In this paper, a batch adsorption system was applied to study the adsorption of Ca(II) ions from aqueous solution by thermosensitive chitosan hydrogels. Due to the presence of sodium β-glycerophosphate (β-GP) in the sol structure, chitosan salts respond with phase transition and obtain thermosensitive properties, including changes in sorption abilities. Experimental research (the maximum adsorption capacity obtained 1.157 g g⁻¹) and theoretical investigation on sorption of calcium in range of concentrations of CaCl₂ solution, has been studied. Equilibria were described by Langmuir, Freundlich, Toth, Redlich-Peterson, Dubinin-Radushkevich, Radke-Praushnitz, Fritz-S, Langmuir-Freundlich, Marczewski-Jaroniec, Bi-Langmuir isotherm equations. Whereas, to describe sorption kinetics an original model was proposed, which combine chemical reaction on sorbent surface and intraparticle diffusion. The process of sorption was described by two parameters: diffusion coefficient D_AB = 2.967·10⁻⁹ m² s⁻¹ and surface process rate constant k_v = 9.129·10⁻⁵ s⁻¹.

壳聚糖的主要应用之一是基于其结合离子的能力。实质上，由于活性羟基（-OH）和氨基（-NH ₂）的存在，壳聚糖容易与过渡金属离子配位，同时对碱土金属具有较弱的吸附性能。本文采用分批吸附系统研究了热敏壳聚糖水凝胶对水溶液中 Ca(II) 离子的吸附。由于溶胶结构中存在β-甘油磷酸钠（β-GP），壳聚糖盐会发生相变反应并获得热敏特性，包括吸附能力的变化。实验研究（获得的最大吸附量为1.157 g g ^-1_{) 和在 CaCl 2}溶液浓度范围内对钙的吸附的理论研究已经进行了研究。Langmuir、Freundlich、Toth、Redlich-Peterson、Dubinin-Radushkevich、Radke-Praushnitz、Fritz-S、Langmuir-Freundlich、Marczewski-Jaroniec、Bi-Langmuir 等温方程描述了平衡。然而，为了描述吸附动力学，提出了一个原始模型，该模型结合了吸附剂表面的化学反应和颗粒内扩散。吸附过程由两个参数描述：扩散系数D _AB  = 2.967·10 ^-9  m ²  s ^-1和表面处理速率常数k _v  = 9.129·10 ^-5  s ^-1。