交联淀粉微球对对硝基甲苯的吸附行为研究

摘要

以可溶性淀粉为原料,通过反相悬浮聚合的方法合成交联淀粉微球(CSM).研究了CSM对对硝基甲苯(PNT)的吸附行为,利用扫描电镜(SEM)、傅里叶红外光谱仪(FT-IR)、X射线衍射仪(XRD)对CSM及其吸附产物进行表征,并分析了其吸附动力学特性和热力学性质.结果表明:在研究范围内,CSM对PNT吸附100 min后达到平衡,且吸附行为同时符合Langmuir方程和Freundlich方程；在不同温度下,CSM吸附PNT的吸附自由能变(△G)、吸附焓变(△H)、吸附熵变(△印均为负值,吸附是一个自发、放热过程；CSM主要通过物理吸附方式吸附PNT.%The crosslinked starch microspheres (CSM) were prepared by the inverse suspension polymerization with soluble starch as raw materials. The adsorption behavior of CSM for p-nitrotoluene (PNT) was investigated. The structures of CSM before and after adsorption were characterized by scanning electron microscope (SEM), FT-IR spectroscopy and X-ray diffraction (XRD), and the kinetics and thermodynamics characteristics were also analyzed. The results showed that within the scope of the study, the adsorption reached equilibrium after 100 min, and the adsorption behavior accorded with both Langmiur and Freundlich equation. The free energy change AG, enthalpy change AH, entropy change AS for p-nitrotoluene adsorbed by CSM were all negative at different temperatures. The adsorption was a spontaneous and exothermic process. The CSM absorb PNT mainly by means of physical adsorption.