Ultra-thin iron phosphate nanosheets for high efficient U(VI) adsorption

JOURNAL OF HAZARDOUS MATERIALS

卷:371

Article

Wang, De¹  Xu, Yanbin¹  Xiao, Difei¹  Qiao, Qingan¹  Yin, Ping¹  Yang, Zhenglong¹  Li, Jinxing²  Winchester, William³  Wang, Zhe³  Hayat, Tasawar⁴ 

[1] Ludong Univ, Sch Chem & Mat Sci, Yantai 264025, Peoples R China

[2] Chinese Acad Sci, CAS Key Lab Photovolta & Energy Conservat Mat, Inst Plasma Phys, POB 1126, Hefei 230031, Anhui, Peoples R China

[3] Xavier Univ Louisiana, Dept Chem, New Orleans, LA 70125 USA

[4] King Abdulaziz Univ, NAAM Res Grp, Fac Sci, Jeddah 21589, Saudi Arabia

关键词: 2D Materials;    Fe-7(PO4)(6);    U (VI);    Adsorption;    Nanosheets;   

DOI  :  10.1016/j.jhazmat.2019.02.091

来源: Elsevier

【 摘 要 】

In this study, the ultra-thin iron phosphate Fe-7(PO4)(6) 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(2).g(-1)), FP1 shows an extreme-high U(VI) adsorption capacity (704.23 mg.g(-1) at 298 K, pH = 5.0 +/- 0.1), which is about 27 times of conventional 3D Fe-7(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.

【 授权许可】

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