Efficient Adsorption of Radioactive Iodide by Copper/Palygorskite Composite

Xiangkun YU; Kun LIU; Zhipeng LI; Yulu ZHAO; Jinyou SHEN; Ping MAO; Aiwu SUN; Jinlong JIANG

doi:10.15541/jim20200663

Journals >Journal of Inorganic Materials >Volume 36 >Issue 8 >Page 856 > Article

Journal of Inorganic Materials
Vol. 36, Issue 8, 856 (2021)

Efficient Adsorption of Radioactive Iodide by Copper/Palygorskite Composite

Xiangkun YU¹, Kun LIU¹, Zhipeng LI¹, Yulu ZHAO¹, Jinyou SHEN², Ping MAO^1、*, Aiwu SUN^1、*, and Jinlong JIANG¹

Author Affiliations

¹1. Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province, National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization, School of Chemical Engineering, Huaiyin Institute of Technology, Huaian 223003, China

²2. Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

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DOI: 10.15541/jim20200663 Cite this Article

Xiangkun YU, Kun LIU, Zhipeng LI, Yulu ZHAO, Jinyou SHEN, Ping MAO, Aiwu SUN, Jinlong JIANG. Efficient Adsorption of Radioactive Iodide by Copper/Palygorskite Composite[J]. Journal of Inorganic Materials, 2021, 36(8): 856 Copy Citation Text

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SEM images of the samples (a) PAL, (b) Cu 2+@PAL, (c) Cu@PAL and (d) EDX pattern of Cu@PAL

1. SEM images of the samples (a) PAL, (b) Cu ²⁺@PAL, (c) Cu@PAL and (d) EDX pattern of Cu@PAL

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2. (a) XRD patterns of the samples and (b) structural schematic diagram of Cu@PAL

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3. (a) TEM image of Cu²⁺@PAL and elemental mappings of (b) N, (c) O, (d) Al, (e) Si, and (f) Cu

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4. (a) TEM image of Cu@PAL and elemental mappings of (b) N, (c) O, (d) Al, (e) Si, and (f) Cu; and high magnification TEM (g) and HRTEM (h) images of Cu@PAL

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5. XPS spectra of the samples

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6. (a) TGA curves and (b) FT-IR spectra of the samples

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7. (a) N₂ adsorption-desorption isotherms and (b) pore diameter distributions of the samples

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8. (a) Adsorption capacity of I^- anions on Cu@PAL and (b) XRD patterns of adsorption products in the solution with different pH

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9. (a) Adsorption isotherm of the samples, fitting curves of (b) Langmuir model and (c) Frenudlich model for adsorption isotherm of Cu@PAL

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10. SEM (a) and TEM (b) and HRTEM (c) images of I-Cu@PAL

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11. Absorption kinetic curve (a), fitting curves of the pseudo first order kinetic model (b) and pseudo second order kinetic model (c) for adsorption kinetic of Cu@PAL

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12. Effect of (a) anion and (b) cation on the adsorption of Cu@PAL

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Composition	PAL	Cu@PAL
SiO₂	60.96	59.87
MgO	9.36	8.12
Al₂O₃	12.20	11.07
Fe₂O₃	8.00	7.51
CaO	5.55	0.46
CuO	0.01	9.83
Na₂O	0.12	0.01
LOI	3.80	3.13

Table 1. Chemical analysis (XRF) of PAL and Cu@PAL/wt%

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Adsorbent	pH	Q_e/ (mg∙g^-1)	Utilization efficiency/%	Ref.
Cuprite sulfide	7	6.1	—	[27]
Cu₂O/Cu-C	7	41.2	10.38	[28]
Hollow Cu/Cu₂O	7	33.0	1.85	[20]
Core-shell Cu/Cu₂O	7	22.9	1.4	[12]
Cu	7	6.35	0.32	[29]
Cu/PAL	7	116.1	71.98	This work

Table 2. Comparison of several Cu based adsorbents for iodide adsorption

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Langmuir model			Frenudlich model
Q_m/(mg∙g^-1)	K_l	R²	K_f	1/n	R²
1.02915	0.86041	0.99632	0.38173	0.51042	0.81026

Table 3. Isotherm parameters for the adsorption of I^- anions by Cu@PAL

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Time/h	Q_e/(mg∙g^-1)
Time/h	Cu@PAL	Nano-Cu
0	74.2	234.7
12	69.4	133.8
24	68.1	110.4
48	64.1	104.6
72	60.2	96.3
144	58.7	88.4

Table 4. Adsorption properties of Cu@PAL and nano Cu exposed to air

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Pseudo-first-order			Pseudo-second-order
Q_m/ (mg∙g^-1)	k₁/(g∙(mmol∙ g^-1)^-1)	R²	Q_m/ (mg∙g^-1)	k₂/(g∙(mmol∙ g^-1)^-1)	R²
56.10	0.4469	0.9704	74.1840	0.03549	0.9976

Table 5. Kinetic parameters for the adsorption of I^- by Cu@PAL

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Adsorbent	c_NaCl/(mol∙L^-1)	Desorption efficiency/%
Cu@PAL	0	21.3
Cu@PAL	0.1	32.1
Nano-Cu	0	87.4
Nano-Cu	0.1	94.1

Table 6. Leaching or desorption efficiencies of Cu@PAL and nano-Cu after adsorption

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