磁性羧甲基纤维素基水凝胶的制备及其对Cu^2+的吸附行为

以羧甲基纤维素、β-环糊精和Fe3O4粒子为主要原料,采用接枝共聚法,制备了具有高吸附性能的磁性羧甲基纤维素基水凝胶(MHG)。采用FTIR、SEM等手段对MHG的物化结构进行了表征,用静态吸附的方法研究了MHG在不同温度和不同Cu^2+溶液质量浓度中的吸附行为,采用准一阶方程、准二阶方程对其吸附过程进行拟合。结果表明:MHG对蒸馏水的吸水量可高达5767 g/g,具有超优良的吸水效果。在不同质量浓度的Cu^2+溶液中,吸附量随着Cu^2+溶液质量浓度的升高而增多;当吸附温度为20~40℃时,MHG对Cu^2+的吸附量在吸附初期随着吸附温度的升高而增加,后期吸附量随吸附温度的增加变化不大。MHG对Cu^2+的最高吸附量可达465 mg/g,是一种优良的重金属离子吸附剂。

Preparation of Magnetic Carboxymethyl Cellulose-based Hydrogels and Adsorption Behavior of Cu^2+

Magnetic carboxymethyl cellulose-based hydrogels(MHG)with high adsorption properties were prepared by graft copolymerization using carboxymethylcellulose,β-cyclodextrin and Fe3O4 as the main raw materials.The physical and chemical structures of MHG were characterized by FTIR and SEM.The adsorption behavior of Cu^2+on MHG in different temperature and different solution concentration was studied by static adsorption method.The quasi-first-order equation and quasi-second-order equation were used to fit the adsorption process.The experimental results show that the water absorption rate of MHG can reach 5767 g/g in distilled water,and it has super power of sop up water.In solutions of different mass concentrations,the amount of adsorption increases with concentration of Cu^2+rising.When the adsorption temperature increased from 20℃to 40℃,the adsorption capacity of Cu^2+on MHG increased with the increase of adsorption temperature.The adsorption capacity of Cu^2+on MHG was up to 465 mg/g,which could be used as an excellent heavy metal ion adsorbent.