<trans-title>Carbothermic Synthesis of Carbon-supported Zero-valent Iron Material for Removal of U(Ⅵ) from Aqueous Solution</trans-title>

Jiaqi WANG; Hongwei PANG; Hao TANG; Shujun YU; Hongtao ZHU; Xiangxue WANG

doi:10.15541/jim20190378

Journal of Inorganic Materials, Volume. 35, Issue 3, 373(2020)

Carbothermic Synthesis of Carbon-supported Zero-valent Iron Material for Removal of U(Ⅵ) from Aqueous Solution

Jiaqi WANG1... Hongwei PANG2, Hao TANG2, Shujun YU2, Hongtao ZHU1, and Xiangxue WANG1,23,* |Show fewer author(s)

¹Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China

²MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China

³Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang 621010, China

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Figures & Tables(10)

1. SEM image (a), element mapping (b) and EDS pattern(c) of Fe-CB

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2. XRD patterns (a) and N₂ adsorption-desorption isotherm (b) of SA, nZVI and Fe-CB; FT-IR spectra (c) of SA and Fe-CB; magnetization curve (d) of Fe-CB

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3. Effect of contact time on the sorption of U(VI) by Fe-CB (a), and corresponding simulation of kinetics data by pseudo-first-order model (b) and pseudo-second-order model (c)

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4. Adsorption isotherms (a) and linear plots of lnK_d against C_e(b) for the elimination of U(Ⅵ) by Fe-CB at 328, 313 and 298 K

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5. Effect of pH (a) and ionic strength (b) on U(Ⅵ) sorption by Fe-CB, Zeta-potential of Fe-CB (c), and relative distribution of U(VI) species in different pH (d)

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6. XPS survey spectra of Fe-CB before and after reaction with U(Ⅵ) (a), high resolution XPS spectrum of U4f (b), and deconvolution analyses of Fe2p (c); O1s (d) for Fe-CB before and after U(Ⅵ) adsorption

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Table 1. BET results of nZVI, SA and Fe-CB
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Table 1. BET results of nZVI, SA and Fe-CB
Material Specific surface area/(m²·g^-1) Pore diameter/nm
nZVI 4.1 1.03
SA 0.2 2.12
Fe-CB 346.6 20.12

Table 2. Kinetic model parameters for remove of U(Ⅵ) by Fe-CB
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Table 2. Kinetic model parameters for remove of U(Ⅵ) by Fe-CB
Pseudo-first-order model Pseudo-second-order model
k₁/min^-1 Q_e/(mg·g^-1) R₁² k₂/(g·mg^-1·min^-1) Q_e/(mg·g^-1) R₂²
0.4388 57.3 0.489 0.0026 64.3 0.998

Table 3. Fitting parameters of adsorption isotherms for U(Ⅵ) on Fe-CB
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Table 3. Fitting parameters of adsorption isotherms for U(Ⅵ) on Fe-CB
T/K Langmuir model Freundlich model
Q_m/(mg·g^-1) k_L/(L·mg^-1) R₁² k_F/(mg^1-ⁿ·Lⁿ·g^-1) n R₂²
298 77.3 1.40 0.971 62.6 18.62 0.788
313 89.7 1.54 0.970 71.1 16.29 0.884
328 103.7 1.25 0.959 76.4 12.15 0.901

Table 4. Thermodynamic parameters at different temperatures
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Table 4. Thermodynamic parameters at different temperatures
T/K ΔG^θ/(kJ·mol^-1) ΔS^θ/(J·K^-1·mol^-1) ΔH^θ/(kJ·mol^-1)
298 -5.74 34.84 4.64
313 -6.61
328 -7.72

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Jiaqi WANG, Hongwei PANG, Hao TANG, Shujun YU, Hongtao ZHU, Xiangxue WANG. Carbothermic Synthesis of Carbon-supported Zero-valent Iron Material for Removal of U(Ⅵ) from Aqueous Solution[J]. Journal of Inorganic Materials, 2020, 35(3): 373

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