乙二胺丙酰化交联壳聚糖微球对甲基橙的吸附性能

Adsorption performance of ethylenediamine propionyl crosslinked chitosan microspheres to methyl orange

通过丙烯酰化交联壳聚糖微球(AGCS)上的丙烯酰基团与乙二胺的Michael加成反应,制备乙二胺丙酰化交联壳聚糖微球(EAGCS)。分别采用傅里叶变换红外光谱(FT-IR)、X射线光电子能谱(XPS)和X射线衍射(XRD)表征了EAGCS的结构,利用激光粒度分析仪进行了粒径分布分析,考察了甲基橙(MO)溶液pH、温度、浓度和EAGCS用量对EAGCS吸附性能的影响。结果表明:EAGCS为球形,微球的体积平均粒径为57.4μm,粒径分布系数1.53;在最佳条件下,EAGCS的吸附去除率为99.6%,吸附容量可达545.40 mg·g^(-1),吸附过程属于自发放热过程,吸附动力学符合二级动力学,吸附过程可采用Langmuir和Freundlich等温吸附模型来描述。

By propylene acylation crosslinked chitosan microspheres（AGCS） reacting with ethylenediamine, the ethylenediaminepropionyl crosslinked chitosan microspheres（EAGCS） with an abundant of amine groups were prepared. The structure of EAGCS was characterized by Fourier transform infrared spectroscopy（FT-IR）, X-ray photoelectron spectroscopy（XPS） and X-ray diffraction analysis（XRD） respectively. The particle size was identified by laser particle size analyzer. The effects of the p H, temperature, concentration and EAGCS dosage of methyl orange（MO） solution on adsorption performance were also investigated systematically. The results show that the structure of EAGCS with spherical morphology consistents with expected design structure, the volume average particle size of EAGCS is 57.4 μm and the particle size distribution coefficient is 1.53. It＇s also found that the highest adsorption capacity and highest removal rate are up to 545.40 mg·g（-1） and 99.6% respectively under the optimal conditions. Furthermore, the adsorption thermodynamics studies indicate that the adsorption is a spontaneous as well as exothermic process, also the kinetic and isothermal adsorption model studies suggest that this adsorption kinetics is pseudo-second-order, which is fit to Langmuir and Freundlich isothermal adsorption model.