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

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

doi:10.15541/jim20190378

Journals >Journal of Inorganic Materials >Volume 35 >Issue 3 >Page 373 > Article

Journal of Inorganic Materials
Vol. 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 WANG^{1、2、3、*}

Author Affiliations

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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DOI: 10.15541/jim20190378 Cite this Article

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 Copy Citation Text

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

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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

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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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 1. BET results of nZVI, SA and Fe-CB

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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 2. Kinetic model parameters for remove of U(Ⅵ) by Fe-CB

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T/K	Langmuir model			Freundlich model
T/K	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 3. Fitting parameters of adsorption isotherms for U(Ⅵ) on Fe-CB

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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

Table 4. Thermodynamic parameters at different temperatures

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