氨基膦酸酯功能化碳材料对钍的选择性电吸附性能研究

doi:10.19964/j.issn.1006-4990.2024-0084

Abstract

Abstract:

To separate and remove trace thorium from rare earths，a carbon electrode material（CNT-P） was prepared by modifying aminated carbon nanotubes（CNT-N） with phosphonate.The morphology，composition and electrochemical properties of CNT-P were analyzed by scanning electron microscope（SEM），surface area analyzer，X-ray photoelectron spectroscopy（XPS），thermogravimetric analyzer（TGA），Fourier transform infrared spectrometer（FT-IR） and electrochemical workstation.The effects of solution medium，pH，voltage and the initial thorium concentration on the adsorption of thorium were studied.The adsorption selectivity of CNT-P toward thorium and rare earths was discussed.The regenerative recycling performance of CNT-P was examined.The results indicated that CNT-P was a mesoporous and macroporous structure combined electrode material，with a BET specific surface area of 111.6 m²/g，a pore volume of 0.85 cm³/g and an average pore size of 30.13 nm.The maximum electrosorption capacity of CNT-P towards thorium reached 219 mg/g in hydrochloric acid solution.The separation factors for Th/REs were higher than 10 at voltage of 3.5 V.After 5 cycles of adsorption-desorption，the adsorption capacity of CNT-P toward thorium maintained 87% as compared with its initial adsorption and basically kept stable.Therefore，CNT-P showed a promising application prospect for the efficient removal of micro-trace thorium from rare earth earths.

Key words: carbon electrode, thorium, rare earths, electrosorption, separation

CLC Number:

TQ127.1

QUAN Jiayuan, FU Chunyan, DENG Bicheng, HUANG Yabin, KUANG Wangqiang, KUANG Shengting, LIAO Wuping. Study on selective electrosorption of thorium by carbon material containing aminophosphonate functional group[J]. Inorganic Chemicals Industry, 2024, 56(12): 42-50.

Figures/Tables 8

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Table 1

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时间/ min	吸附容量/（mg·g^-1）
时间/ min	CNT-N-盐酸	CNT-P-盐酸	CNT-P-硫酸	CNT-P-硝酸
30	1.2	3.1	3.5	3.2
60	2.9	7.0	7.2	4.7
90	4.3	11.5	10.5	6.4
120	5.4	16.2	13.2	7.1
150	6.8	19.7	15.4	7.8
180	7.8	24.3	18.3	8.6
210	9.2	27.2	20.1	9.4
240	10.1	36.0	23.5	10.1
270	10.8	38.2	25.1	11.0
300	11.2	39.8	26.0	12.1

时间/min	吸附容量/（mg·g^-1）	去除率/%
30	1.28	54.2
60	1.57	62.3
90	1.68	65.0
120	1.73	69.8
600	1.80	72.9

元素	C_吸附前/ （mg·L^-1）	C_吸附后/ （mg·L^-1）	吸附容量/（mg·g^-1）			β_Th/RE
元素	C_吸附前/ （mg·L^-1）	C_吸附后/ （mg·L^-1）	3.0 V	3.5 V	4.0 V	3.0 V	3.5 V	4.0 V
Th	6.03	4.66	51.52	60.41	70.37
La	5.85	5.84	6.78	4.63	7.05	7.16	12.07	9.77
Gd	5.80	5.79	5.38	3.77	4.31	9.19	15.31	15.67
Lu	5.99	5.82	1.75	3.24	8.88	9.18	17.86	7.38

循环次数	吸附容量/ （mg·g^-1）	解吸率/ %	Q_i /Q₁×100%
1	101.30	81.1	100
2	105.10	90.1	104
3	92.22	96.5	91
4	86.02	97.1	85
5	88.30	97.7	87

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Study on selective electrosorption of thorium by carbon material containing aminophosphonate functional group

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