中文摘要：

以硅酸钠为前驱体，制备得到硅溶胶，然后采用原位聚合法一步合成了聚硅酸／聚丙烯酰胺复合絮凝剂，通过红外光谱对合成产物的结构进行了表征。采用透光率、化学需氧量去除率对絮凝剂的絮凝效果进行了表征，并探讨了聚硅酸pH值、老化时间、聚合反应温度和时间等合成条件对絮凝效果的影响。结果表明，当硅酸钠浓度为0．5mol／L、聚硅酸pH=5、老化时间为24h、丙烯酰胺为5g、引发剂用量为0．3g，聚合反应温度为70℃、时间为90min时，得到的聚硅酸／聚丙烯酰胺絮凝剂的絮凝效果最佳。

英文摘要：

Silica sol was prepared by using sodium silicate as a precursor, and then the poly（silicic acid）/polyacrylamide composite flocculant was synthesized through in-situ polymerization. The chemical structure of the composite flocculant was characterized by Fourier-transform infrared spectroscopy （FTIR）. The effects of pH value, reaction time and temperature on flocculation effectiveness were investigated by light transmittance and removal ratio for the oil-containing waste water. It was found that the composite flocculant exhibited the best flocculation performance when the synthetic conditions were set to the sodium silicate concentration of 0. 5 tool/L, the acrylamide amount of 5.0 g, the initiator amount of 0. 3 g, the i3oly（silicic acid） acidity of pH=5, the reaction time of 90 min, the aging time of 24 h, and the temperature of 70 ℃.