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Macroscopic and microscopic insight into the mutual effects of europium(iii) and phosphate on their interaction with graphene oxide

机译：宏观和显微镜洞察铕（III）的相互影响和磷酸盐与石墨烯氧化物的相互作用

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Graphene oxide (GO) has been proved to be very efficient for radionuclide enrichment. However, its potential performance for binary sorbate systems containing both a radionuclide and phosphate receives little attention. In this study, the mutual effects of Eu( III ) and phosphate on their co-removal processes by GO as a function of contact time, pH and temperature were investigated in detail. The results show that the presence of phosphate can enhance not only the removal amount of Eu( III ) but also the removal kinetics of Eu( III ) on GO surfaces, and vice versa . Both the external mass transfer and diffusion of solute inside GO are important for the Eu( III ) and phosphate co-removal rate. Evaluation of the thermodynamic parameters (Δ G ~(0) < 0, Δ H ~(0) > 0 and Δ S ~(0) > 0) indicates the co-removal process is endothermic and spontaneous. The results of X-ray photoelectron spectroscopy (XPS) and zeta potential (ZP) analyses indicate that the oxygen-containing functional groups on GO surfaces play an important role in the co-removal process. This study provides a quantitative investigation of Eu( III ) and phosphate with GO, which can facilitate the assessment of GO as a potential adsorbent for Eu( III ) and phosphate simultaneous cleanup.
机译：石墨烯（GO）已被证明对放射性核素富集非常有效。然而，其含有放射性核素和磷酸盐的二元山梨酸盐系统的潜在性能受到影响。在该研究中，详细研究了Eu（III）和磷酸eu（iii）和磷酸盐对其共消除过程的互相影响，详细研究了接触时间，pH和温度的函数。结果表明，磷酸盐的存在不仅可以增强EU（III）的去除量，而且可以在去表面上的欧盟（III）的去除动力学，反之亦然。溶质内部的外部传质和扩散均对于EU（III）和磷酸盐共移率很重要。评估热力学参数（δg〜（0）<0，δh〜（0）> 0和δs〜（0）> 0）表示共移植过程是吸热和自发的。 X射线光电子能谱（XPS）和Zeta电位（ZP）分析的结果表明，去表面上的含氧官能团在共消除过程中起重要作用。该研究提供了对EU（III）和磷酸盐的定量研究，可促进对EU（III）和磷酸盐同时清理的潜在吸附剂的评估。

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