新型材料淀粉微球对Cu2＋、Cr3＋和Pb2＋的吸附机理研究

以可溶性淀粉为原料,在反相悬浮体系中合成N,N′-亚甲基双丙烯酰胺交联淀粉微球为载体,研究了新型吸附材料淀粉微球（cross-linked starch microsphere,CSMs）对Mn＋（Cu2＋、Cr3＋、Pb2＋）的静态吸附行为。利用扫描电镜、X射线衍射仪和红外光谱仪对微球及其吸附产物进行表征,分析讨论了3种金属原子结构,研究了吸附机理。结果表明：308K时,Cu2＋、Pb2＋和Cr3＋的饱和吸附量分别是2.43、0.30和0.27 mmol/g,CSMs对Cu2＋离子吸附能力最强,并且其通过物理吸附、配位吸附方式吸附Mn＋,并得出引起微球吸附能力大小可能与金属离子电荷、离子半径和外层电子排布的差异因素有关。

Study on adsorption mechanism of starch microspheres novel materials for Cu~（2＋）,Cr~（3＋） and Pb~（2＋）

The cross-linked starch microsphere synthesized from soluble starch by inverse suspension polymeriz-ation with N,N′-methylene bisacrylamide ascross-linking agent was used carrier.The static adsorption behavior of the starch microspheres（CSMs） of novel adsorption materials for Mn＋（Cu2＋,Cr3＋ and Pb2＋）was investigated in this paper.The starch microspheres and their products after adsorption were characterized by scanning electron microscope（SEM）,X-ray diffraction（XRD） and fourier transform infrared spectroscopy（FT-IR）,mechanism of adsorption was also discussed.The results show that the adsorption capacity of CSMs for three different metal irons were 2.43,0.30 and 0.27 mmol/g respectively at 308 K.The starch microspheres have highest adsorption capacity for Cu2＋,they absorb Mn＋ by means of physical adsorption and coordination adsorption.Based on the analysis of three metal atomic structure,the possible factors that caused for the different adsorption capacity of microspheres were metal ionic charge、radius and difference of outer shell electron distribution