Capture of iodine and organic iodides using silica zeolites and the semiconductor behaviour of iodine in a silica zeolite

Pham, Tung Cao Thanh; Docao, Son; Hwang, Inseok; Song, Mee; Choi, Do Young; Moon, Dohyun; Oleynikov, Peter; Yoon, Kyung Byung

doi:10.1039/c5ee02843d

Cited by 210 publications

(98 citation statements)

References 41 publications

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“…80 Besides metal cations, zeolites are also capable of adsorbing other radioactive molecules, such as iodine released during the dissolution of nuclear fuel rods. Recently, Pham et al 81 investigated the capture of iodine by using various types of porous materials, including all-silica zeolites, aluminosilicate zeolites, active carbons, and metal-organic frameworks. All-silica zeolites exhibited superior capability over other porous materials for I 2 removal from highly acidic dissolver solution.…”

Section: Water Purificationmentioning

confidence: 99%

Applications of Zeolites in Sustainable Chemistry

2017

Chem

633

337

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To face the global sustainability issues arising from rapid industry development and population increase, many efforts have been made to develop new materials and technologies toward renewable energy and environmental improvement. Zeolites are a family of crystalline materials with orderly distributed micropores in molecular dimensions. As the most important solid catalysts used in traditional petrochemical industries, zeolites are also finding promising applications in many sustainable processes given their unique shape selectivity, adsorption and ion-exchange capability, high hydrothermal stability, tunable acidity and polarity, and low production costs. In this review, we present the state-of-the-art applications of zeolites as potential solutions to the sustainability issues, including biomass conversion, fuel cells, thermal energy storage, CO 2 capture and conversion, air-pollution remediation, and water purification, etc.

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Section: Water Purificationmentioning

confidence: 99%

Applications of Zeolites in Sustainable Chemistry

2017

Chem

633

337

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“…Technologically appealing properties may also appear if iodine is confined in zeolites, for example in the familiar silicalite (Figure ), where I 2 forms a semiconducting 3D‐supramolecular network (Figure ) . Indeed, the outstanding I 2 sorbent properties detected for this highly hydrophobic silicalite were ascribed to the scarcity of framework defects and the ability to tightly fit I 2 within the channels by forming a confined 3D‐network of iodine …”

Section: Organization Of Dihalogens In 1d Channelsmentioning

confidence: 99%

“…Section 5: confined water and water‐ion clusters is a topic of both historic and fundamental value (see Ref. [44, 45] for a review) – here, the focus is on water‐cation assemblies in natural zeolites. Section 6: confined halogen molecules in nanochannels form relatively simple composites, yet endowed with interesting properties, such as semiconductor behavior Section 7: organic chromophores encapsulated in nanosized containers show exceptional optical properties (Figure ).…”

Section: Introductionmentioning

confidence: 99%

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Supramolecular Organization in Confined Nanospaces

Tabacchi

2018

ChemPhysChem

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Empty spaces are abhorred by nature, which immediately rushes in to fill the void. Humans have learnt pretty well how to make ordered empty nanocontainers, and to get useful products out of them. When such an order is imparted to molecules, new properties may appear, often yielding advanced applications. This review illustrates how the organized void space inherently present in various materials: zeolites, clathrates, mesoporous silica/organosilica, and metal organic frameworks (MOF), for example, can be exploited to create confined, organized, and self-assembled supramolecular structures of low dimensionality. Features of the confining matrices relevant to organization are presented with special focus on molecular-level aspects. Selected examples of confined supramolecular assemblies - from small molecules to quantum dots or luminescent species - are aimed to show the complexity and potential of this approach. Natural confinement (minerals) and hyperconfinement (high pressure) provide further opportunities to understand and master the atomistic-level interactions governing supramolecular organization under nanospace restrictions.

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“…Moreover, Samoć et al have recently demonstrated that formation of dye nanoaggregates, which can be also understood as molecular confinement, results not only in the growth of the emission intensity but also in sizable enhancement of the intrinsic two‐photon absorption cross‐section . It was also shown that the molecular iodine (I 2 ), confined in the zeolite channels, creates three‐dimensional supramolecular structures, which exhibit unique semiconductor properties . In recent years, much effort has been devoted to the studies of electric properties of spatially confined atomic and molecular systems.…”

Section: Introductionmentioning

confidence: 99%

Electric properties of molecules confined by the spherical harmonic potential

Chołuj

Bartkowiak

2019

Int J of Quantum Chemistry

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The harmonic oscillator potential is very often used in quantum chemical studies of electric properties to model the effect of spatial confinement. In the vast majority of works, the harmonic potential of cylindrical symmetry was applied. Thus far, its spherical counterpart was used mainly to describe properties of spatially restricted atomic systems. Therefore, our main goal was to study the molecular electric properties in the presence of the spherically symmetric harmonic oscillator potential and to characterize the impact of the relative position of the considered molecules and spherical confinement on these properties. Moreover, we analyzed how the topology of confining environment affects the dipole moment and (hyper)polarizability, by comparing the results obtained in the spherical and cylindrical harmonic potential.Based on the conducted research, it was found that the position of the molecules relative to the spherical confinement strongly influences their electric properties. The observed trends of changes in the electric properties, caused by increasing the confinement strength, vary significantly. Moreover, it was shown that in the vast majority of cases, significant differences in the values of electric properties, obtained in the cylindrical and spherical confinement of a given strength, occur. K E Y W O R D S dipole moment, (hyper)polarizability, spatial confinement, spherical harmonic oscillator potential 1 | INTRODUCTION In 1937 Michels et al proposed a model in which the hydrogen atom was placed inside the spherically symmetric, nonpenetrable potential of a givenradius. [1] The authors used this model to analyze the influence of pressure on the structure of energy levels and the polarizability of hydrogen atom.This was one of the first works, which initiated the development of quantum-chemical studies on the spatial confinement phenomenon. The current state of knowledge on this subject is summarized in many excellent reviews. [2][3][4][5][6][7][8] Atoms and molecules subjected to high pressure are just one of many examples of spatially confined systems. Another interesting one is the semiconductor structure such as quantum well, wire and dot. Their construction is based on the limitation of the movement of charge carriers (holes or electrons) in one or more directions in space. The properties of such systems are controlled, inter alia, by changing their size (quantum size effect). [2,4] Together with the development of nanotechnology, chemical objects, having in their structure empty spaces, gained much attention. Among them, one can mention: zeolites, crystalline mesoporous silica, metal-organic frameworks, as well as nanotubes and fullerenes. Inclusion compounds (also called guest-host system), resulting from trapping atoms, ions or molecules inside such chemical cages, are another important example of the spatial confinement phenomenon. [2,9,10]

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Capture of iodine and organic iodides using silica zeolites and the semiconductor behaviour of iodine in a silica zeolite

Abstract: During the reprocessing of spent nuclear fuel rods, a highly moist off-gas mixture containing various volatile radioactive species, such as iodine (I2), organic iodides and nitric acid, is produced.

Cited by 210 publications

References 41 publications

Applications of Zeolites in Sustainable Chemistry

Applications of Zeolites in Sustainable Chemistry

Supramolecular Organization in Confined Nanospaces

Electric properties of molecules confined by the spherical harmonic potential

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