The Effects of Oxygen Functional Groups on Graphene Oxide on the Efficient Adsorption of Radioactive Iodine

Zhang, Qian; Gao, Yonghui; Xu, Zhanglian; Wang, Sheng; Kobayashi, Hisayoshi; Wang, Jie

doi:10.3390/ma13245770

Cited by 20 publications

(17 citation statements)

References 34 publications

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“…The Cr 2 B 2 O 2 MBene considered above is fully terminated by the oxygen functional group. While during the actual experimental preparation periods, the process of oxygen adsorption is continuous, and the adsorbed sites tend to be disordered . Thus, considering the nonuniformity of oxygen adsorption is critical for evaluating the effects on magnetic and electronic properties.…”

Section: Resultsmentioning

confidence: 99%

“…While during the actual experimental preparation periods, the process of oxygen adsorption is continuous, and the adsorbed sites tend to be disordered. 55 Thus, considering the nonuniformity of oxygen adsorption is critical for evaluating the effects on magnetic and electronic properties. By calculating the energies of oxygen adsorption on the nearest and farthest neighbors of Cr 2 B 2 , we found that the energy of oxygen adsorption is lower when the distance is farther.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Magnetic Superexchange Induced Quantum Phase Transition in Cr₂B₂ MBene

et al. 2022

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Stable long-range magnetic order in low-dimensional semiconductors up to room temperature has long been the pursuit of researchers for their potential applications in the field of spintronic and memory devices. However it is a great challenge to achieve magnetic phase transition together with a controllable band structure in two-dimensional magnetic materials simultaneously. Through fully terminated oxygen group adsorption, the transformation from ferromagnetic metal to antiferromagnetic semiconductor with a high Neél temperature (425 K) has been achieved in Cr 2 B 2 MBene, which is attributed to superexchange interaction between the interlayer magnetic chromium (Cr) atoms. Furthermore, exotic quantum phase transition between two different antiferromagnetic states of Cr 2 B 2 O 2 , together with the transition from semiconductor to metal, is observed when applying compressive strain. Interestingly, ferromagnetic half-metal and ferromagnetic semiconductor states are achieved by nonuniform oxygen group adsorption, resulting from electrical potential difference between the Cr atomic layers and thus built-in electric field. Our results reveal the origin of magnetic phase transition in Cr 2 B 2 MBene and offer a new avenue to obtain magnetic multifunctional materials for spintronic devices.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Magnetic Superexchange Induced Quantum Phase Transition in Cr₂B₂ MBene

et al. 2022

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“…[ 28 ] The density functional theory (DFT) calculation results suggested that oxygen‐containing groups result in strong interactions between iodine and rGO through a covalent bond‐forming process, among which OH groups possessed a higher adsorption energy on average. [ 28 ]…”

Section: Resultsmentioning

confidence: 99%

“…More importantly, oxygen-containing functional groups remaining on reduced GO had been confirmed to greatly enhance the adsorption of iodine. [28] The density functional theory (DFT) calculation results suggested that oxygen-containing groups result in strong interactions between iodine and rGO through a covalent bond-forming process, among which OH groups possessed a higher adsorption energy on average. [28] To better understand the origin of the adsorption capability, we set up a controlled experiment using rGO with various degrees of reduction.…”

Section: Resultsmentioning

confidence: 99%

Advanced Zinc–Iodine Batteries with Ultrahigh Capacity and Superior Rate Performance Based on Reduced Graphene Oxide and Water‐in‐Salt Electrolyte

Ji¹,

Xie

Shen³

et al. 2023

Adv Funct Materials

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Aqueous rechargeable zinc-iodine batteries have received increasing attention in the field of portable electronics due to their high safety, low-cost, and great electrochemical performance. However, the insulated nature of iodine and the unrestricted shuttle effect of soluble triiodide seriously limit the lifespan and Coulombic efficiency (CE) of the batteries. Herein, a highperformance zinc-iodine energy storage system based on the hydrothermal reduced graphene oxide (rGO) and a high concentration zinc chloride waterin-salt electrolyte are promoted. The 3D microporous structures and outstanding electrical conductivity of rGO make it an excellent host for iodine, while the water-in-salt electrolyte effectively suppresses the shuttle effect of triiodide and improves the CE of the system. As a result, an ultra-high I 2 mass loading of 25.33 mg cm −2 (loading ratio of 71.69 wt.%) is realized during the continuous charging/discharging process. The batteries deliver a high capacity of 6.5 mAh cm −2 at 2 mA cm −2 with a much-improved CE of 95% and a prominent rate performance with capacity of 1 mAh cm −2 at 80 mA cm −2 . A stable long-term cycling performance is also achieved with capacity retention of 2 mAh cm −2 after 2000 cycles at 50 mA cm −2 .

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“…It is known in the literature that the carboxylic acid groups permit the binding of iodine. [ 86 ] In addition to the binding of iodine by the delocalized π‐surface, the presence of free carboxyl groups appears to abet iodine binding to account for the observed sorption of I 2 by MONs. Thus, these findings establish the fact that iodine capture proceeds through chemisorption involving the formation of CTCs.…”

Section: Resultsmentioning

confidence: 99%

Metal–Organic Nanosheets (MONs): Exfoliation by Mechanical Grinding and Iodine Capture

Tamuly

Sama

Moorthy

2022

Adv Materials Inter

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in terms of the number of MOFs synthesized over the past two decades for a variety of applications, MOFs with high iodine uptake capacity remain conspicuously sparse. [7] 129 I is one of the most hazardous radioisotopes in nuclear waste with a long radioactive half-life of 1.57 × 10 7 years. Several adsorbents that include chalcogenides, aerogels, functionalized clays, silver-based porous zeolitic materials, etc. with loading amounts ranging from 8 to 175 wt% have been reported. [8][9][10] However, their application is precluded by one or the other of the disadvantages such as high cost, limited adsorption ability, and serious environmental effects. The materials with better high-iodine trapping ability are a need of the hour. In general, adsorption capacity for iodine by porous materials is related not only to the pore size but also to other important factors such as effective availability of sorption sites, I 2 -framework interactions, composition/ratio of I 2 and polyiodide anions. One of the important ways to develop materials with high iodine capture is to introduce π-conjugated organic ligands, pyridines with readily available electron pairs and electron-rich functional groups such as OH, NH 2 , NR 2 , and COOH, which permit either formation of stable charge-transfer complexes or stronger halogen bonds with iodine; electron-rich moieties are expected to enhance charge-transfer interactions and hence the efficiency of adsorption of iodine. [11][12][13][14][15][16][17] The properties of any porous material are determined by constituent building blocks, pore attributes, and characteristics of the exposed surface area. As compared to 3D MOFs, the analogous lower dimensional 2D metal-organic nanosheets (MONs) have garnered much attention in the last few years [18][19][20][21][22][23][24][25] since the discovery of graphene and its burgeoning applications in diverse domains. [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] An important feature of MONs is the high surface area, which allows better interaction with guest molecules. Due to the ultrathin nature of the sheets, [42] large surface area, high ratio of surface area-to-volume, [43] and readily accessible active sites, MONs have been tremendously explored for gas separations, [30][31][32][33][34][35] energy storage and conversion, [38] catalysis, [28] sensing, [34,39] etc. The synthesis of 2D MONs is a challenge, as the growth of the crystals is a limiting factor. Several synthetic strategies have now been developed for MONs, which include bottom-up and top-down approaches. [19][20][21][22][23] The former is a straightforward direct synthesis of nanosheets from An electron-rich π-conjugated organic linker H 4 BPDP (BPDP = biphenyl dipyrrole tetracarboxylic acid) is designed and subjected to metal-assisted self-assembly to afford a layered metal-organic framework (MOF), i.e., Cd-BPDP. Single crystal X-ray structure determination and analysis show that two corrugated layers of the MOF are intertwined to yield thick strands of porous 2D metal-o...

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The Effects of Oxygen Functional Groups on Graphene Oxide on the Efficient Adsorption of Radioactive Iodine

Cited by 20 publications

References 34 publications

Magnetic Superexchange Induced Quantum Phase Transition in Cr₂B₂ MBene

Magnetic Superexchange Induced Quantum Phase Transition in Cr₂B₂ MBene

Advanced Zinc–Iodine Batteries with Ultrahigh Capacity and Superior Rate Performance Based on Reduced Graphene Oxide and Water‐in‐Salt Electrolyte

Metal–Organic Nanosheets (MONs): Exfoliation by Mechanical Grinding and Iodine Capture

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The Effects of Oxygen Functional Groups on Graphene Oxide on the Efficient Adsorption of Radioactive Iodine

Cited by 20 publications

References 34 publications

Magnetic Superexchange Induced Quantum Phase Transition in Cr2B2 MBene

Magnetic Superexchange Induced Quantum Phase Transition in Cr2B2 MBene

Advanced Zinc–Iodine Batteries with Ultrahigh Capacity and Superior Rate Performance Based on Reduced Graphene Oxide and Water‐in‐Salt Electrolyte

Metal–Organic Nanosheets (MONs): Exfoliation by Mechanical Grinding and Iodine Capture

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Magnetic Superexchange Induced Quantum Phase Transition in Cr₂B₂ MBene

Magnetic Superexchange Induced Quantum Phase Transition in Cr₂B₂ MBene