废弃除铜吸附剂的除磷性能

为了更高效率利用除铜吸附剂，降低除磷成本，提出了一种有效、经济的废弃吸附剂的处理方式。将吸附了铜离子的磁性壳聚糖修饰氧化石墨烯（MNPs@CS@GO），不经过洗脱，直接利用附着的铜离子用于吸附水溶液中磷酸根离子。利用红外光谱对吸附前后吸附剂的结构进行表征，并考察了溶液pH、吸附剂用量、振荡时间对吸附剂吸附磷酸根离子的影响，得出了最佳的吸附条件。结果表明：吸附剂饱和吸附容量为11.4 mg·g-1；吸附剂除磷的再生性良好；吸附过程能用准二级动力学模型很好地进行拟合。

A recycling method to disused adsorbent after removing copper ions

We report an efficient and economical method for the reuse of disused adsorbents following copper ion adsorption. As the aqueous copper solution also contained phosphorus, this novel method in turn decreased the cost of alternative phosphorous removal processes. Following Cu(II) adsorption, magnetic chitosan-modified graphene oxide (MNPs@CS@GO) was directly applied in the adsorbtion of phosphate from the aqueous solution, removing the requirement for a separate elution process. The adsorbent was characterized by Fourier transform infrared spectroscopy (FTIR) both before and after Cu(II) and phosphate adsorption. The optimal conditions for the adsorption process were determined through variation of a number of experimental parameters, such as solution pH, contact time, and sorbent quantity. A maximum adsorption capacity of 11.4 mg·g-1 was recorded, and reproducibility of the adsorbent was favorable. Finally, the adsorption process fit well with the pseudo-second-order model.