A complex chitosan/β-cyclodextrin polymer was synthesized by bridging with maleoyl chains followed by cross-linking with glutaraldehyde. The adsorption performance of the synthetic polymer was investigated for the selective removal of methyl orange (MO) from aqueous solution. The kinetic behavior was well fitted by the pseudo-second order model, while the adsorption process at equilibrium followed the Langmuir isotherm model. The thermodynamic parameters suggested that the adsorption was exothermic and spontaneous. Under optimal adsorption conditions, the capacity for MO reached 392 mg/g with the dosage of 10 mg/50 mL. Based on the analysis from FTIR, ¹H NMR, TGA and zeta potential, the adsorption mechanism could be explained by the synergistic effect of electrostatic attraction of amino groups from chitosan and host-guest interaction from β-cyclodextrin. This adsorbent also demonstrated high selectivity towards MO due to the unique structure of cross-linked chitosan/β-cyclodextrin polymer that are complementary to that of MO molecule.

中文翻译：

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用于选择性去除甲基橙的交联壳聚糖/β-环糊精复合物：吸附性能和机理

通过与马来酰基链桥接，然后与戊二醛交联，合成了复杂的壳聚糖/β-环糊精聚合物。研究了从水溶液中选择性去除甲基橙（MO）的合成聚合物的吸附性能。拟二级模型很好地拟合了动力学行为，而平衡吸附过程遵循了Langmuir等温模型。热力学参数表明吸附是放热的和自发的。在最佳吸附条件下，剂量为10 mg / 50 mL时，MO的容量达到392 mg / g。根据FTIR的分析，¹1 H NMR，TGA和zeta电位可通过壳聚糖氨基静电吸引和β-环糊精与客体相互作用的协同作用来解释。由于与MO分子互补的交联的壳聚糖/β-环糊精聚合物的独特结构，该吸附剂还显示出对MO的高选择性。