氧化石墨烯/改性磁性壳聚糖复合材料对Cu2+的吸附研究

Study on adsorption of Cu2+ by GO/modified magnetic chitosan composite

以石墨粉和壳聚糖为原料,采用Hummers法制备氧化石墨烯,再用四氧化三铁、二乙烯三胺和柠檬酸改性壳聚糖,合成了羧甲基氨基化改性磁性壳聚糖;通过超声分散制备氧化石墨烯水溶胶,再与改性磁性壳聚糖进行复合,成功制得氧化石墨烯/改性磁性壳聚糖复合吸附材料。研究结果表明,在pH=6,吸附剂用量为50mg,吸附时间为90min条件下,氧化石墨烯/改性磁性壳聚糖复合吸附材料对100mL、50mg/L铜离子(Cu^2+)的吸附容量达到70.3mg/g,且吸附行为符合Freundlich等温吸附模型。

Graphene oxide was prepared via hummers method with graphite powder and chitosan as raw materials.Then,ferriferrous oxide,diethylenetriamine(DETA)and citric acid modified chitosan were used to synthesize the ethyloic-amino modified magnetic chitosan.By means of ultrasonic dispersion,GO hydrosol was prepared for its further combination with the modified magnetic chitosan,so that the GO/modified magnetic chitosan composite materials used for adsorption could be made successfully.The adsorption experiment showed that,when pH=6,the dosage of adsorbent was 50mg and the adsorption time was 90min,this composites could reach an adsorption capacity of 70.3mg/g with its adsorption behavior in accordance with freundlich isothermal adsorption model when adsorbing 100mL of Cu^2+ at a concentration of 50mg/L.