Adsorption Properties of Novel Bismuth-based SiOCNF Composite Membrane for Radioactive Gaseous Iodine

doi:10.15541/jim20220011

Abstract

Abstract:

Radioactive iodine is one of the typical nuclear fission products. As a result, adsorption-separation- solidification of radioactive iodine (¹²⁹I, ¹³¹I, etc.) is important for nuclear power operations and spent fuel reprocessing. In this study, a novel type of bismuth-based composite nanofiber membrane (Bi@SiOCNF) was prepared by thermal reduction and electro-spinning technology using a kind of commercial poly-thylsilsesquioxane resin (MK resin) as raw material. Based on SiOC fiber, the bismuth metal was uniformly loaded on the surface of SiOCNF and in the three-dimensional network space, showing excellent capability for capturing and immobilizing gaseous iodine. According to the adsorption experiment results, the material can reach the maximum saturated adsorption capacity as high as 515.2 mg/g within 2 h. Adsorption mechanism of gaseous iodine on bismuth-based SiOCNF composite nanofiber membrane was through chemical adsorption and physical adsorption which was verified by XRD, XPS and other tests. Thermogravimetry analysis (TGA) demonstrated that the Bi@SiOCNF owned an excellent thermal stability. All above properties indicate that the material has potential applications in the capturing, fixation and storage of radioactive gaseous iodine in nuclear power plants and spent fuel reprocessing plants.

Key words: gaseous iodine, radioactive, electrospinning, bismuth, adsorption

CLC Number:

TL941

LIU Cheng, ZHAO Qian, MOU Zhiwei, LEI Jiehong, DUAN Tao. Adsorption Properties of Novel Bismuth-based SiOCNF Composite Membrane for Radioactive Gaseous Iodine[J]. Journal of Inorganic Materials, 2022, 37(10): 1043-1050.

Figures/Tables 10

Fig. 1 Electrospinning process of Bi@SiOCNF material

Fig. 2 Photos of (a,b) MK fiber membrane and (c) Bi@SiOCNF

Fig. 3 XRD pattern of Bi@SiOCNF

Fig. 4 (a-c) SEM images of Bi@SiOCNF-5, Bi@SiOCNF-8, Bi@SiOCNF-10, (d-e) EDS spectrum and mappings of Bi@SiOCNF-8, and (f-h) TEM images of Bi@SiOCNF-8

Fig. 5 Bi@SiOCNF adsorption characteristic curves of iodine vapor (a) Adsorption kinetic curves; (b) Adsorption isotherm curves

Table 1 Adsorption performance of different adsorbents for iodine

Adsorbent	T/℃	Adsorption Capacity/(mg·g^-1)	Ref.
HT	40	1400	[23]
PU1	70	1300	[24]
Cu-BTC@PES	75	639	[25]
Al-O-F	90	49	[26]
Ag⁰Z	100-200	156	[27]
Ag-ETS-2	80	255	[28]
Ag@Mon-POF	70	250	[29]
Bi₆O₇	25	285	[21]
Ag-loaded aerogel	150	410	[30]
Bi-BP₂-O	200	468	[22]
Bi@SiOCNF-10	75	515.2	This work

Fig. 6 Histograms of physisorption and chemisorption capacities of Bi@SiOCNF with different loadings

Fig. 7 (a) XRD pattern of I-Bi@SiOCNF, (b) XPS survey spectra, corresponding (c) Bi4f Spectra of I-Bi@SiOCNF and Bi@SiOCNF and (d) I3d spectra of I-Bi@SiOCNF

Fig. 8 (a-c) SEM images of I-Bi@SiOCNF-5, I-Bi@SiOCNF-8, I-Bi@SiOCNF-10, (d, e) EDS spectrum and mappings of I-Bi@SiOCNF-8, and (f-h) TEM images of I-Bi@SiOCNF-8

Fig. 9 TGA curves of Bi@SiOCNF-10 and I-Bi@SiOCNF-10

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