磁性壳聚糖铜印迹树脂的吸附热力学和动力学

Preparation and Adsorption Properties of Cu^(2+) Imprinted Magnetic Chitosan Microspheres

采用反相悬浮法,以戊二醛为交联剂,Cu^(2+)为印迹模板,壳聚糖为基体包埋F_3O_4磁性颗粒,制备了磁性壳聚糖印迹树脂(MICM)。对产物进行了红外光谱(FTIR)表征和物理性能测定,研究了产物对铜的吸附热力学和动力学。结果表明,壳聚糖的氨基和羟基参与了印迹和交联作用,产物的含水率和机械损失率降低,耐酸性增强。吸附热力学和动力学过程分别符合Langmuir等温模型和准二级动力学方程,吸附是自发的、吸热的、熵增大的过程。

Using cyclohexane as the oil phase,glutaraldehyde as the cross-linking agent,Cu2＋ as the imprinted template,chitosan as matrix embedding F_3O_4 magnetic particles,an imprinted magnetic chitosan resins（ MICM） is prepared. The products were characterized by infrared spectrometry（ FTIR）, the physical properties of the products were tested, the adsorption thermodynamics and kinetics to copper of the products were researched. The results showed that the amino and hydroxyl groups of chitosan were involved in imprinting and cross-linking reaction. The water content and the mechanical loss rate of the products were decreased and the acid resistance was enhanced. The adsorption thermodynamics and kinetics were consistent with Langmuir isotherm model and pseudo-second kinetic equation, the process of adsorption is spontaneous,endothermic and entropy increasing.