Ternary Layered Double Hydroxide Supported Sulfide NZVI: Efficient U(VI) Elimination and Mechanism

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

doi:10.15541/jim20190365

Journals >Journal of Inorganic Materials >Volume 35 >Issue 3 >Page 381 > Article

Journal of Inorganic Materials
Vol. 35, Issue 3, 381 (2020)

Ternary Layered Double Hydroxide Supported Sulfide NZVI: Efficient U(VI) Elimination and Mechanism

Hongwei PANG¹, Hao TANG¹, Jiaqi WANG², Xiangxue WANG^1、2, and Shujun YU^1、*

Author Affiliations

¹MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China

²Heibei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China

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DOI: 10.15541/jim20190365 Cite this Article

Hongwei PANG, Hao TANG, Jiaqi WANG, Xiangxue WANG, Shujun YU. Ternary Layered Double Hydroxide Supported Sulfide NZVI: Efficient U(VI) Elimination and Mechanism[J]. Journal of Inorganic Materials, 2020, 35(3): 381 Copy Citation Text

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1. SEM images of NZVI (A), SNZVI (B), CMAL (C) and CMAL-SNZVI (E); TEM images of CMAL (D) and CMAL- SNZVI (F)

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2. Element mapping of Ca(A), Mg(B), Al(C), Fe(D), S(E), and O(F), and EDS pattern (G) of CMAL-SNZVI

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3. XRD patterns (A) of CMAL-SNZVI, CMAL and SNZVI, N₂ adsorption-desorption isotherm (B)and magnetization curve (C) of CMAL-SNZVI

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4. Adsorption kinetics (A), pseudo-first-order (B) and pseudo-second-order kinetic plots (C), adsorption isotherms (D) of U(VI) adsorption on CMAL-SNZVI and CMAL

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5. Effect of pH (A) and ionic strength (C) on U(VI) adsorption of CMAL-SNZVI and CMAL, Zeta potential values of CMAL-SZVI as a function of pH (B), species distribution of U(VI) as a function of pH by Visual MINTEQ (D)

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6. XPS survey spectra of CMAL-SNZVI (before and after U(VI) adsorption) (A), High -resolution XPS spectra of U4f (B), Fe2p (C), S2p (D), Ca2p (E), Mg1s (F) and Al2p (G), and removal mechanisms of U(VI) on CMAL-SNZVI (H)

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Material	Pseudo-first-order model			Pseudo-second-order model
Material	k₁/min^-1	Q_e/(mg·g^-1)	R²	k₂/(g·mg^-1·min^-1)	Q_e/(mg·g^-1)	R²
CMAL	0.049	62.62	0.95	0.0015	65.36	0.99
CMAL-SNZVI	0.121	87.60	0.94	0.0036	90.09	0.99

Table 1. Kinetic modeling of U(VI) adsorption on CMAL and CMAL-SNZVI

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Adsorbents	Langmuir model			Freundlich model
Adsorbents	Q_max/(mg·g^-1)	K_L/(L·mg^-1)	R²	K_F/(mg^1-ⁿ·Lⁿ·g^-1)	n	R²
CMAL	129.8	0.36	0.975	51.5	3.89	0.877
CMAL	175.7	0.95	0.954	89.5	4.60	0.933
-SNZVI	175.7	0.95	0.954	89.5	4.60	0.933

Table 2. Parameters calculated from the Langmuir and Freundlich models for U(VI) adsorption on CMAL-SNZVI at 25 ℃

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Adsorbents	pH	Equilibrium time/h	Removal capacity /(mg·g^-1)	Ref.
nZVI/C composite	4.0	Not given	103.1	[25]
g-C₃N₄@Ni-Mg-Al-LDH	5.0	6	99.7	[26]
Ca-Mg-Al-LDH	5.0	24	132.5	[27]
GO@LDH	4.5	10	159.7	[28]
Magnetic biochar	3.0	12	54.4	[29]
CMAL	5.0	2	129.8	This study
CMAL-SNZVI	5.0	2	175.7	This study

Table 3. Comparison of CMAL-SNZVI with other typical adsorbents for U(VI) decontamination

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