Ultra-thin iron phosphate nanosheets for high efficient U(VI) adsorption
Ultra-thin iron phosphate nanosheets for high efficient U(VI) adsorption
复制标题
超薄磷酸铁纳米片可高效吸附 U(VI)
DOI：
10.1016/j.jhazmat.2019.02.091
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发表时间：
2019
影响因子：
13.6
通讯作者：
Tasawar Hayat
中科院分区：
文献类型：
--
作者：
De Wang;Yanbin Xu;Difei Xiao;Qingan Qiao;Ping Yin;Zhenglong Yang;Jinxing Li;William Winchester;Zhe Wang;Tasawar Hayat
本研究设计了一种新型的二维铀吸附材料--超薄磷酸铁Fe 7（PO 4）6纳米片（FP 1），其形貌可控，可用于铀的吸附。由于其独特的高度可及的2D结构、原子分散的磷酸盐/铁锚基团和高比表面积，（27.77 m2·g−1），FP 1显示出极高的U（VI）吸附能力（704.23 mg·g− 1，298 K，pH = 5.0 ± 0.1），约为常规3D Fe 7（PO 4）6的27倍（24.51 mg·g-1-sample FP 2），高于大多数二维吸附材料，在放射性废水处理中显示出很大的应用价值。吸附结果表明，U（VI）与FP 1的吸附是自发的吸热吸附，符合单分子层吸附。吸附后的FESEM、EDS、Mapping、FT-IR和XRD分析表明，吸附机理可能为单分子层表面络合堆积模式（MSCS-Mode）。该研究不仅为二维磷酸盐材料的制备提供了一种新的方法，也为其他二维吸附材料的研究开辟了一条新的途径。
In this study, the ultra-thin iron phosphate Fe7(PO4)6nanosheets (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 m2⋅g−1), FP1 shows an extreme-high U(VI) adsorption capacity (704.23 mg·g−1at 298 K, pH = 5.0 ± 0.1), which is about 27 times of conventional 3D Fe7(PO4)6(24.51 mg·g−1-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.