淀粉/凹凸棒粘土复合吸附絮凝材料的研究

采用接枝聚合法在硅烷化凹凸棒粘土(OATP)表面接枝淀粉,制备淀粉/凹凸棒粘土(ATP)复合吸附絮凝材料.采用傅里叶变换红外光谱(FT-IR)、扫描电子显微镜(SEM)对淀粉/ATP进行了表征,并对其制备条件进行了优化.结果表明,当淀粉质量分数(相对OATP质量)为100%,聚合反应时间为3 h,引发剂质量分数为0.003%,反应温度为60℃时,制备的淀粉/ATP对镉离子的最大吸附容量可达到36.78 mg/g.与ATP、OATP相比,淀粉/ATP对镉离子的吸附容量增大了2倍以上.复合材料具有比OATP更强的捕获能力,所形成的絮凝体大而密实,比淀粉絮凝剂具有更好的沉降性能.

Study on Starch/Attapulgite Adsorbent and Flocculent Composite

Graft polymerization, starch/attapulgite( ATP) adsorbent was synthesized by grafting starch onto the silane coupling reagent modified ATP( OATP).The preparing conditions of the starch/ATP were investigated, and the analysis by FT/IR and SEM were conducted to characterize the synthesized starch/ATP.Fourier transform infrared spectroscopy( FT-IR) , scanning e-lectron microscopy( SEM) of starch/ATP were characterized and optimized its preparation conditions.The results show that the prepared starch/ATP gives a maximum Cd2+ adsorption capacity of 36.78 mg·g-1 under following conditions:starch mass con-centration of 100.0%( relative to OATP mass, the same hereinafter) , reaction time of 3 h, initiator dosage of 0.003%( weight) and reaction temperature of 60℃.It was found that the Cd2+ adsorption capacity of the Starch/ATP prepared under the above con-ditions is more than 2 folds compared with those of the ATP and OATP.The captured ability of the composite material is better than OATP, forming large and dense flocs, its settlement capacity is superior to starch flocculants.