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Wang D, Xu Y, Xiao D, Qiao Q, Yin P, Yang Z, Li J, Winchester W, Wang Z, Hayat T. Ultra-thin iron phosphate nanosheets for high efficient U(VI) adsorption. J Hazard Mater 2019; 371:83-93. [PMID: 30849574 PMCID: PMC6759232 DOI: 10.1016/j.jhazmat.2019.02.091] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2018] [Revised: 02/03/2019] [Accepted: 02/25/2019] [Indexed: 05/06/2023]
Abstract
In this study, the ultra-thin iron phosphate Fe7(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 m2⋅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 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.
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Affiliation(s)
- De Wang
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, PR China
| | - Yanbin Xu
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, PR China.
| | - Difei Xiao
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, PR China
| | - Qingan Qiao
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, PR China
| | - Ping Yin
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, PR China
| | - Zhenglong Yang
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, PR China
| | - Jiaxing Li
- CAS Key Laboratory of Photovoltaic and Energy Conservation Materials, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei 230031, PR China.
| | - William Winchester
- Chemistry Department, Xavier University of Louisiana, New Orleans, LA, 70125, USA
| | - Zhe Wang
- Chemistry Department, Xavier University of Louisiana, New Orleans, LA, 70125, USA.
| | - Tasawar Hayat
- NAAM Research Group, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
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Abstract
Alkali metal ion exchange (Li+, Na+ and K+) on chromium phosphate (CrPO4) was studied potentiometrically as a function of temperature and metal ion concentration. The shift in the potentiometric titration curves corresponding to the exchange of alkali metal cations increased with increasing pH and concentration of the metal ions, while the opposite results were obtained by increasing the temperature of the system. The affinity of the exchanger for alkali metal ions was also found to be in the order Li+ > Na+ > K+. The data were employed to evaluate the apparent deprotonation constants of CrPO4 and the corresponding thermodynamic parameters ΔH0, ΔS0 and ΔG0.
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Affiliation(s)
- S. Mustafa
- National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan
| | - S. Murtaza
- National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan
| | - A. Naeem
- National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan
| | - B. Dilara
- National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan
| | - K. Farina
- National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan
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Abstract
The divalent metal ion sorption (Cu(2+), Cd(2+), Ni(2+), and Pb(2+)) on chromium phosphate (CrPO(4)) was studied as a function of pH, temperature, and concentration of metal ions. The sorption of metal ions is observed to increase with the increase in pH, temperature, and concentration of metal ions in solution. The mechanism of sorption is found to be the exchange of the hydrolyzed metal cations with the protons from solid at high temperature. The sorption at low temperature is found to be accompanied by the precipitation of the corresponding metal phosphates such as Pb(3)(PO(4))(2).
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Affiliation(s)
- S Mustafa
- National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan.
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