丙烯酰胺/氢氧化铝改性淀粉两性絮凝剂的合成及表征

The Synthesis and Characterization of Amphoteric Flocculant of Starch Modified by Al(OH)3 and Acrylamide

以玉米淀粉、丙烯酰胺、氯化铝和碳酸铵为主要原料合成了一种新型有机-无机两性絮凝剂,即丙烯酰胺-氢氧化铝改性淀粉絮凝剂.利用红外光谱仪、X-射线衍射仪、热重分析仪和扫描电镜对絮凝剂的结构进行了表征.研究结果表明:在过硫酸铵和亚硫酸氢钠引发剂作用下丙烯酰胺与玉米淀粉发生聚合反应并与氢氧化铝胶体通过离子键键合,絮凝剂明显具有反应物的特征吸收峰,热稳定性优于淀粉,并呈无晶型结构特征,在水处理中能较好地发挥吸附作用.

A new organic-inorganic amphoteric flocculant,which modified by acrylamide and alumina hydroxide,is synthesized from corn starch,acrylamide,aluminum chloride and ammonium carbonate.The structure of the flocculant is studied by fourier transform infrared spectrometer,X-ray diffractometer,thermogravimetric analyzer and scanning electronic microscope.The results show that acrylamide and corn starch are polymerized and then formed the ionic bond with aluminium hydroxide under the action of ammonium persulfate and sodium bisulfate.The flocculant which reserves more obvious characteristic absorption peaks has laminar structure without crystal accumulation and good thermal stability,so the flocculant can better play roles of adsorption in the water treatment.