印迹改性磁性交联壳聚糖的表征及吸附性能

Characterization and adsorption performance of imprinting modified magnetic crosslinking chitosan

为了提高壳聚糖(CS)对Pb2+的去除能力,制备了印迹改性磁性交联壳聚糖(Pb-TMCS),采用FTIR、SEM和XRD对其结构和形态进行了表征,研究了Pb-TMCS对Pb2+的吸附、脱附性能及选择性。结果表明:与CS相比,Pb-TMCS的表面孔隙和褶皱增多;Pb-TMCS引入了更多的—OH和—NH2;Pb-TMCS内部包覆磁性物质Fe3O4,Pb-TMCS对CS的相对选择性系数大于2;Pb-TMCS对Pb2+的吸附量从CS的25.57mg/g提高到45.26mg/g,脱附3次后仍可重复使用。Pb-TMCS回收方便,对Pb2+选择吸附性能好,无污染,在重金属废水处理中具有广阔的应用前景。

The imprinting modified magnetic crosslinking chitosan(Pb-TMCS)was prepared to improve the removal ability of chitosan(CS)to Pb2+,whose structure and morphology were characterized by FTIR,SEM and XRD,and the adsorption,desorption performance and selectivity of Pb2+on Pb-TMCS were studied.Results show that compared with CS,Pb-TMCS has more pore and fold,and more—OH and—NH2are introduced.The magnetic material Fe3O4 is embed in Pb-TMCS.The relative selectivity coefficient of Pb-TMCS to CS is more than 2.Pb-TMCS shows higher adsorption capacity(45.26mg/g)than CS(25.57mg/g)for Pb2+.Pb-TMCS could be used repeatedly after being desorpted 3times.Recycling of Pb-TMCS is convenient,and it has high selective adsorption for Pb2+,and it is non-polluting,so it has good application prospect in treatment of heavy metal waste water.