聚硅酸铝钛改性纤维素复合絮凝剂的制备及其絮凝性能研究

Study on Preparation and Flocculation Performance of Composite Flocculant Modified Cellulose with Aluminum Titanium Polysilicate

絮凝法以简便、廉价的优势在染料废水处理中有着广泛的应用,将阳离子基团引入到絮凝剂中可以提高对染料的去除性能以加快絮体的沉降速度。采用阳离子醚化剂3-氯-2-羟丙基三甲基氯化铵(CHTPAC)对纤维素进行改性得到两性纤维素(CMCCTA);以硅酸钠、硫酸铝、硫酸钛为原料与两性纤维素进行复合,制备了聚硅酸铝钛-两性纤维素复合絮凝剂。通过单因素实验探究了两性纤维素的最佳合成条件与复合絮凝剂的制备及应用的最佳条件,对刚果红的去除率可达到95%。通过傅里叶变换红外光谱、X射线衍射仪、扫描电镜对其进行表征分析,结果表明两性纤维素与聚硅酸成功复合。制备的两性絮凝剂具有环保高效的特点,金属离子与两性纤维素的引入,提高了絮凝效果,增强了聚硅酸盐的稳定性,具有良好的应用前景。

Flocculation has been widely used in the treatment of dye wastewater for its advantages of simplicity and low cost.Introducing cationic groups into flocculants can improve the removal performance of dyes and accelerate the settling rate of floc.Cellulose was modified with cationic etherification agent 3-chloro-2-hydroxypropyl trimethylammonium chloride(CHTPAC)to prepare amphotericin(CMCCTA).Polyaluminum-titanium-amphoteric cellulose composite flocculant was prepared by using sodium silicate,aluminum sulfate and titanium sulfate as raw materials and amphoteric cellulose.The optimum conditions for synthesis of amphotic cellulose and preparation and application of composite flocculant were investigated by single factor experiment.The removal rate of Congo red could reach 95%.It was characterized by FTIR,XRD and SEM.The results showed that amphoteric cellulose and polysilicic acid were successfully combined.The amphoteric flocculant prepared in this study has the characteristics of environmental protection and high efficiency.The introduction of metal ions and amphoteric cellulose improves the flocculation effect and enhances the stability of polysilicate,which has a good application prospect.