Wang De, Xu Yanbin, Xiao Difei, Qiao Qingan, Yin Ping, Yang Zhenglong, Li Jiaxing, Winchester William, Wang Zhe, Hayat Tasawar
School of Chemistry and Materials Science, Ludong University, Yantai 264025, PR China.
School of Chemistry and Materials Science, Ludong University, Yantai 264025, PR China.
J Hazard Mater. 2019 Jun 5;371:83-93. doi: 10.1016/j.jhazmat.2019.02.091. Epub 2019 Feb 25.
In this study, the ultra-thin iron phosphate Fe(PO) nanosheets (FP1) with fine-controlled morphology, has been designed as a new two-dimensional (2D) material for uranium adsorption. Due to its unique high accessible 2D structure, atom-dispersed phosphate/iron anchor groups and high specific surface area (27.77 m⋅g), FP1 shows an extreme-high U(VI) adsorption capacity (704.23 mg·g at 298 K, pH = 5.0 ± 0.1), which is about 27 times of conventional 3D Fe(PO) (24.51 mg·g -sample FP2) and higher than most 2D absorbent materials, showing a great value in the treatment of radioactive wastewater. According to the adsorption results, the sorption between U(VI) and FP1 is spontaneous and endothermic, and can be conformed to single molecular layer adsorption. Based on the analyses of FESEM, EDS, Mapping, FT-IR and XRD after adsorption, the possibile adsorption mechanism can be described as a Monolayer Surface Complexation and Stacking mode (MSCS-Mode). Additionally, the research not only provide a novel preparing method for 2D phosphate materials but also pave a new pathway to study other two-dimensional adsorption materials.
在本研究中，具有精细可控形貌的超薄磷酸铁Fe(PO)纳米片（FP1）被设计为一种用于铀吸附的新型二维（2D）材料。由于其独特的高可及二维结构、原子分散的磷酸盐/铁锚定基团和高比表面积（27.77 m²·g⁻¹），FP1表现出极高的U(VI)吸附容量（在298 K、pH = 5.0 ± 0.1时为704.23 mg·g⁻¹），约为传统三维Fe(PO)（样品FP2为24.51 mg·g⁻¹）的27倍，且高于大多数二维吸附材料，在放射性废水处理中具有巨大价值。根据吸附结果，U(VI)与FP1之间的吸附是自发且吸热的，并且符合单分子层吸附。基于吸附后FESEM、EDS、Mapping、FT-IR和XRD的分析，可能的吸附机制可描述为单层表面络合和堆积模式（MSCS模式）。此外，该研究不仅为二维磷酸盐材料提供了一种新颖的制备方法，也为研究其他二维吸附材料开辟了一条新途径。
