以羟乙基纤维素(HEC)和聚乙烯亚胺(PEI)为原料,在水介质中,通过戊二醛进行交联,并包埋磁性Fe3 O4,制备了磁性羟乙基纤维素-聚乙烯亚胺(Fe3 O4-HEC-PEI)吸附材料。用红外光谱(FT-IR)、X射线衍射(XRD)、X 射线光电子能谱(XPS)和震动样品磁强计(VSM)对 Fe3 O4-HEC-PEI 吸附材料进行了表征,用电感耦合等离子体质谱仪(ICP-MS)测定了其对Pb(Ⅱ)离子的吸附性能。表征结果说明,HEC 和PEI成功交联,并对 Fe3 O4颗粒进行了包埋,Fe3 O4-HEC-PEI的饱和磁化强度为52．59 A·m2/kg,其中的Fe3 O4仍为单一相的反尖晶石型结构。吸附测试结果表明,Fe3 O4-HEC-PEI 对 Pb (Ⅱ)的吸附在120 min达到平衡,吸附动力学符合准二级动力学模型,吸附等温数据更好的符合 Freundlich 模型。Fe3 O4-HEC-PEI吸附Pb(Ⅱ)离子的 Gibbs 自由能变ΔG0＜0,焓变ΔH0＝－8．83 kJ/mol,熵变ΔS0＝－18．29 J/(mol·K),说明 Fe3 O4-HEC-PEI 对 Pb (Ⅱ)离子的吸附是一个放热和熵减少的自发过程。
The Fe3 O4-hydroxyethyl cellulose-polyethyleneimine (Fe3 O4-HEC-PEI)was successfully prepared as a magnetic adsorbent by crosslinking hydroxyethyl cellulose (HEC)and polyethyleneimine (PEI)with glutaral-dehyde,then coating magnetic Fe3 O4 in an aqueous medium.The obtained Fe3 O4-HEC-PEI was characterized by fourier transform infrared spectroscopy (FT-IR),X-ray diffraction (XRD),X-ray photoelectron spectrosco-py (XPS),and vibrating sample magnetometer (VSM).The adsorption of Pb(Ⅱ)ion on Fe3 O4-HEC-PEI was determined by inductively coupled plasma mass spectrometry (ICP-MS).It was found that HEC and PEI were successfully crosslinked and assembled on the surface of Fe3 O4 particles,the saturation magnetization of Fe3 O4-HEC-PEI was 52.59 A·m2/kg.The Fe3 O4 in Fe3 O4-HEC-PEI still maintained an inverse spinel structure.The adsorption of Pb(Ⅱ)ion reached equilibrium after approximately 120 min,the adsorption kinetics followed the mechanism of the pseudo-second-order equation.The adsorption data was fit better with Freundlich equation. The negative values of Gibbs free energy (ΔG0<0,ΔH0=-8.83 kJ/mol andΔS0=-18.29 J/(mol·K))sug-gest that the adsorption process is spontaneous and exothermic with a reduced entropy.
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