乙二胺还原的氧化石墨烯对镉离子的动态吸附

Dynamic adsorption of Cd^(2+) onto graphene oxide reduced by ethylenediamine

以乙二胺(EDA)还原氧化石墨烯(GO)制得一种吸附剂材料,即还原态氧化石墨烯(RGO)。考察了动态条件下Cd2+溶液的初始浓度、流速及吸附床高度对穿透曲线的影响,同时利用Bed-Depth-Service Time(BDST)模型对吸附床高度与穿透时间的关系进行线性拟合分析,研究了RGO对Cd2+溶液的动态吸附性能。结果表明,RGO可以有效地去除水溶液中的Cd2+,随着吸附床高度的增加,离子的去除率增大,穿透时间延长;当溶液初始浓度增大时穿透时间缩短,离子的去除率减小;而溶液的流速加快,穿透时间和去除率都相应减小。吸附床高度与穿透时间的关系可用BDST模型较好地进行描述,预测新的操作条件下的穿透时间与实验值误差均小于5%。

Reduced graphene oxide(RGO) by ethylenediamine was prepared and acted as absorbant materials.The effects of inlet initial Cd2 +concentration,feed flow rate and bed height on breakthrough curve were studied,meanwhile,the Bed-Depth-Servic Time(BDST) model was applied to analyze the relationship between bed height and breakthrough time,then the dynamic adsorption propertyof Cd2 +on RGO was investigated.The results showed that Cd2 +could be removed from aqueous solution by RGO efficiently.The removal rate and breakthrough time were proportional to the height of adsorption bed.The breakthrough time and the removal rate were inversely proportional to the initial concentration.Also,the breakthrough time and the removal rate of the solution were inversely proportional to the flow rate.The BDST model could describe the relationship between bed height and breakthrough time,which could accurately forecast the breakthrough time under new conditions with the error below 5%.