Effects of NO2 aging on bismuth nanoparticles and bismuth-loaded silica xerogels for iodine capture

Baskaran, Karthikeyan; Elliott, Casey; Ali, Muhammad; Moon, Jeremy; Beland, Jade; Cohrs, Dave; Chong, Saehwa; Riley, Brian J.; Chidambaram, Dev; Carlson, Krista

doi:10.1016/j.jhazmat.2022.130644

Cited by 10 publications

(7 citation statements)

References 52 publications

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“…The iodine loading capacities of AgX granules were consistent and higher than AgZ (i.e., 11 m % I or Q e ≈ 0.12–0.13 g/g; see Table S3, SI) . A comparison of iodine loading capacities between AgX, AgZ, and Ag-based and other metal-based aerogels and xerogels are provided in Figures S7 and S8 and Table S4 (SI). ,,,− …”

Section: Results and Discussionmentioning

confidence: 83%

Iodine Capture by Ag-Loaded Solid Sorbents Followed by Ag Recycling and Iodine Immobilization: An End-to-End Process

Yadav

Chong

Riley

et al. 2023

Ind. Eng. Chem. Res.

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The article demonstrates the complete process of I2(g) capture using Ag-exchanged faujasite (AgX) and Ag-exchanged mordenite (AgZ) zeolite sorbents, the recovery of Ag for recyclability of iodine capture, and the immobilization of iodide (from the elution process) into an iodosodalite waste form, which is chemically and environmentally stable. The gaseous iodine, I2(g), was captured in the AgX via chemisorption by Ag and converted to AgI within the aluminosilicate zeolite frameworks. The elution reaction in Na2S resulted in the precipitation of Ag2S and dissolution of I– and Na+ into the aqueous solution, where powdered sorbent showed higher conversion efficiency than the granular form, which is attributed to Na2S-solution diffusion limitations in the granules. The Ag2S-containing aluminosilicate precipitates were filtered out of the solution, and the filtrate (aqueous solution) was used to synthesize iodosodalite to immobilize iodide. The iodine capture using the recovered Ag2S-containing sorbents shows equivalent iodine loadings to the AgX starting material of Q e = 0.355 g/g for powdered material and 0.255 g/g for granular material, demonstrating the potential recycling of Ag for iodine capture as Ag2S-based sorbents.

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Section: Results and Discussionmentioning

confidence: 83%

Iodine Capture by Ag-Loaded Solid Sorbents Followed by Ag Recycling and Iodine Immobilization: An End-to-End Process

Yadav

Chong

Riley

et al. 2023

Ind. Eng. Chem. Res.

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“…As shown in Figure 2h, the curve of Bi@Al/SiO 2(4 mL) -∞ has only one wide nuclear magnetic signal around −96.5 ppm. However, three distinct 29 Si signals, −91.6, −101.1, and −111.6 ppm, appeared on the curve of Bi@Al/SiO 2(4 mL) -2, which can be assigned to Q 2 , Q 3 , and Q 4 29 Si species, as determined through fitting. [35] The emergence of new Q 4 species indicates that Al doping can significantly increase the framework's cross-linking degree.…”

Section: Resultsmentioning

confidence: 84%

“…Recent focus has converged on bismuth-based functional materials (BBMs) due to their significant advantages such as relatively high I 2 sorption capacity and low production costs. [26][27][28][29][30][31][32][33][34] Since Yang and coworkers reported the first BBM for efficient capture of radioactive iodine in 2015, [58,59] researchers have conducted a large amount of work in this field. However, there are still several issues regarding such materials that need to be addressed.…”

Section: Introductionmentioning

confidence: 99%

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Hollow Core–Shell Bismuth Based Al‐Doped Silica Materials for Powerful Co‐Sequestration of Radioactive I₂ and CH₃I

Tian,

Hao,

Chee

et al. 2023

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Developing pure inorganic materials capable of efficiently co‐removing radioactive I2 and CH3I has always been a major challenge. Bismuth‐based materials (BBMs) have garnered considerable attention due to their impressive I2 sorption capacity at high‐temperature and cost‐effectiveness. However, solely relying on bismuth components falls short in effectively removing CH3I and has not been systematically studied. Herein, a series of hollow mesoporous core–shell bifunctional materials with adjustable shell thickness and Si/Al ratio by using silica‐coated Bi2O3 as a hard template and through simple alkaline‐etching and CTAB‐assisted surface coassembly methods (Bi@Al/SiO2) is successfully synthesized. By meticulously controlling the thickness of the shell layer and precisely tuning of the Si/Al ratio composition, the synthesis of BBMs capable of co‐removing radioactive I2 and CH3I for the first time, demonstrating remarkable sorption capacities of 533.1 and 421.5 mg g−1, respectively is achieved. Both experimental and theoretical calculations indicate that the incorporation of acid sites within the shell layer is a key factor in achieving effective CH3I sorption. This innovative structural design of sorbent enables exceptional co‐removal capabilities for both I2 and CH3I. Furthermore, the core–shell structure enhances the retention of captured iodine within the sorbents, which may further prevent potential leakage.

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“…Generally speaking, the sorption performance of BBMs for iodine is related to the following factors: the valence state of the bismuth component, particle size, and bismuth content, as well as the composition of the sorbent carrier, specific surface area, active site, and so on. Various types of bismuth-based composite materials have been developed to date, including carbon materials, − polymers, , layered double hydroxides (LDHs), silica materials, , and so on. Materials based on carbon or polymers as frameworks often have higher sorption capacities, but most of them are attributed to the weak interaction between the carrier and iodine molecules.…”

Section: Introductionmentioning

confidence: 99%

Hollow Bismuth-Based Nanoreactor with Ultrathin Disordered Mesoporous Silica Shell for Superior Radioactive Iodine Decontamination

Tian,

Chee,

Hao

et al. 2024

Chem Bio Eng.

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The effective removal of radioactive iodine under harsh high-temperature conditions, akin to those encountered in real spent nuclear fuel reprocessing, remains a formidable challenge. Herein, a novel bismuth-based mesoporous silica nanoreactor with a distinctive hollow yolk–shell structure was successfully synthesized by using silica-coated Bi2O3 as a hard template and alkaline organic ammonia for etching (Bi@HMS-1, HMS = hollow mesoporous silica). In contrast to conventional inorganic alkali-assisted methods with organic template agents, our approach yielded a material with thinner and more disordered shell layers, along with a relatively smaller pore volume. This led to a significant reduction in the physisorption of Bi@HMS-1 onto iodine while maintaining a smooth passage of guest iodine molecules into and out of the shell channels. Consequently, the resulting sorbent exhibited an outstanding iodine sorption capacity at high temperatures, achieving a chemisorption percentage as high as 96.5%, which makes it extremely competitive among the currently reported sorbents.

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Effects of NO2 aging on bismuth nanoparticles and bismuth-loaded silica xerogels for iodine capture

Cited by 10 publications

References 52 publications

Iodine Capture by Ag-Loaded Solid Sorbents Followed by Ag Recycling and Iodine Immobilization: An End-to-End Process

Iodine Capture by Ag-Loaded Solid Sorbents Followed by Ag Recycling and Iodine Immobilization: An End-to-End Process

Hollow Core–Shell Bismuth Based Al‐Doped Silica Materials for Powerful Co‐Sequestration of Radioactive I₂ and CH₃I

Hollow Bismuth-Based Nanoreactor with Ultrathin Disordered Mesoporous Silica Shell for Superior Radioactive Iodine Decontamination

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Effects of NO2 aging on bismuth nanoparticles and bismuth-loaded silica xerogels for iodine capture

Cited by 10 publications

References 52 publications

Iodine Capture by Ag-Loaded Solid Sorbents Followed by Ag Recycling and Iodine Immobilization: An End-to-End Process

Iodine Capture by Ag-Loaded Solid Sorbents Followed by Ag Recycling and Iodine Immobilization: An End-to-End Process

Hollow Core–Shell Bismuth Based Al‐Doped Silica Materials for Powerful Co‐Sequestration of Radioactive I2 and CH3I

Hollow Bismuth-Based Nanoreactor with Ultrathin Disordered Mesoporous Silica Shell for Superior Radioactive Iodine Decontamination

Contact Info

Product

Resources

About

Hollow Core–Shell Bismuth Based Al‐Doped Silica Materials for Powerful Co‐Sequestration of Radioactive I₂ and CH₃I