Selective adsorption of 2,3-DCDD and 1,2,3,4-TCDD on *BEA, EMT, FAU and MFI-type zeolites as alternative adsorbents for on-line dioxin monitoring

Mercury, Maud; Denoyel, Renaud; Simon‐Masseron, Angélique; Carette, M.; Zerega, Y.; Patarin, Joël; Soulard, Michel; Reynard, Christelle; Janulyte, Aurika

doi:10.1007/s10450-011-9349-z

Cited by 18 publications

(6 citation statements)

References 14 publications

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“…In order to reduce or eradicate pollution, different techniques are possible such as condensation, 1 catalytic oxidation, 2,3 membrane separation 3 and adsorption. [4][5][6][7][8] The latter is generally preferred due to its good cost-effectiveness and ease of use. Adsorbent materials such as zeolites have been successfully used to solve the contamination problem, especially in the space and environmental industries.…”

Section: Introductionmentioning

confidence: 99%

“…Adsorbent materials such as zeolites have been successfully used to solve the contamination problem, especially in the space and environmental industries. [4][5][6][9][10][11][12][13][14][15][16] Zeolites are aluminosilicate materials made from AlO 4 and SiO 4 tetrahedra sharing their oxygen vertices. Thanks to their high thermal stability coupled with an intrinsic Brönsted acidity, their interesting sorption and catalytic properties are now wellknown.…”

Section: Introductionmentioning

confidence: 99%

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Elaboration of FAU-type zeolite beads with good mechanical performances for molecular decontamination

et al. 2016

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Elaboration of FAU-type zeolite beads with good mechanical performances for molecular decontamination

et al. 2016

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“…Indeed, FAU-type zeolites possess a large microporous volume, accessible even to pollutants with a significant molecular size. 7 Moreover, its chemical composition can be fine-tuned through (1) a broad interval of Si/Al ratios, with which it can be synthesized or postsynthetically modified (1 < Si/Al < ∞), 8 and (2) cationic exchange involving a large number of extra-framework cations. 9 The FAU framework is built on the basis of fused double six-rings (D6Rs), (also called hexagonal prisms) and sodalite cages (also called β-cages).…”

Section: Introductionmentioning

confidence: 99%

“…Zeolites, aluminosilicate crystalline materials with an ordered microporous structure, formed by linking silicon and aluminum tetrahedra, aroused a huge scientific interest related to a wide number of their potential applications, in particular, in environmental remediation. − Among the approximately 250 identified zeolite structures, the faujasite ( FAU ) has attracted a special attention due to its interesting structural, textural, and chemical properties. Indeed, FAU-type zeolites possess a large microporous volume, accessible even to pollutants with a significant molecular size . Moreover, its chemical composition can be fine-tuned through (1) a broad interval of Si/Al ratios, with which it can be synthesized or postsynthetically modified (1 < Si/Al < ∞), and (2) cationic exchange involving a large number of extra-framework cations …”

Section: Introductionmentioning

confidence: 99%

Insights into Water Adsorption in Potassium-Exchanged X-type Faujasite Zeolite: Molecular Simulation and Experiment

et al. 2021

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In the present study, we have combined several atomic-scale computational techniques [static lattice optimization, density functional theory (DFT), canonical Monte Carlo (MC), and Gibbs ensemble MC (GEMC)] with experiment in order to describe the adsorption of water in potassium-exchanged Xtype faujasite. Indeed, by applying DFT calculations, we have evidenced a strongly heterogeneous adsorbent surface and classified the preferential adsorption sites at zero loading for water molecules. The sodalite cage was identified as the preferential location. Moreover, by applying the GEMC technique, we have successfully simulated the water adsorption isotherm in the K−X zeolite. Finally, through the canonical MC simulation, we have described the microscopic mechanisms of water adsorption within the K−X zeolite at various uptakes, ranging from low loading (8 H2O/unit cell) to saturation (240 H2O/unit cell). We have evidenced that at low loading, the sodalite cages host the major part of the adsorbed molecules, while at increasing hydration ratio, the water molecules locate more in supercages. At saturation, each sodalite cage accommodates more than three water molecules on a verage, whereas nearly 90% of water molecules are located within supercages. Finally, at any hydration ratio, the water molecules in supercages coordinate preferentially with potassium cations at crystallographic site III (or III′) rather than at site II. Cations in site II start interacting with water molecules only at uptakes superior to 80 H2O molecules/unit cell, once all cations in site III (or III′) are occupied by at least one water molecule.

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“…Authors of this study have proposed to determine the adsorption properties of zeolites with solutions of dioxins in isooctane. Adsorption isotherms showed that 2,3-DCDD has been adsorbed in the micropores of FAU-NaX zeolite with very high affinity, regarding the adsorbent micropore size and dynamic molecule size, while the adsorption of 1,2,3,4-TeCDD has been limited to the external --surface [25]. Furthermore, the authors explained that the nature of the charge compensating cations could have an influence on the congener adsorption in the micropores [26].…”

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Importance of PCDD/F molecules’ polarizability and steric hindrance on their adsorption onto zeolites in a standard EN1948-1 sampling device for incinerator emission monitoring

et al. 2020

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Currently, polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/F) monitoring at stationary sources uses short-and long-term sampling methods compliant with EN1948 standard. The XAD-2 resin is exposed to gas stream for 3-4 weeks (long term), and subsequently analysed in an accredited laboratory for 2 weeks. With the aim of developing an on-line mass spectrometer device using adsorption onto a set of different zeolites as specific adsorbents prior to mass analysis, the paper proposes to firstly test zeolites within the methods compliant with EN1948 standard. In addition to the non-specific external surface adsorption, zeolites possess micropores for adsorbing molecules specifically. Zeolites allowing selective adsorption of only tetra-and pentachlorinated toxic congeners (TeCDD/F, PeCDD/F) were exposed to the gas flow of a household waste incinerator. As the extraction method of EN 1948 standard does not allow us to discern the two types of adsorption, the adsorbents have been tested at a sampling point located before the last filter. With high congener concentrations, it is expected that the dynamic adsorption properties of the zeolites can be deduced from the breakthrough of some congeners. The electronic interactions between zeolite surface area and PCDD/F involve the polarizability of the molecules. Thanks to the congener breakthrough comparing two zeolite structure types, it has been deduced that toxic TeCDD/F and PeCDD/F were adsorbed in the micropores of FAU-NaX zeolite due to steric compatibility of these congeners. Moreover, the partition of congeners between the condensate and gas phase was elucidated by considering the polarizability of PCDD/F molecules.

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Selective adsorption of 2,3-DCDD and 1,2,3,4-TCDD on *BEA, EMT, FAU and MFI-type zeolites as alternative adsorbents for on-line dioxin monitoring

Cited by 18 publications

References 14 publications

Elaboration of FAU-type zeolite beads with good mechanical performances for molecular decontamination

Elaboration of FAU-type zeolite beads with good mechanical performances for molecular decontamination

Insights into Water Adsorption in Potassium-Exchanged X-type Faujasite Zeolite: Molecular Simulation and Experiment

Importance of PCDD/F molecules’ polarizability and steric hindrance on their adsorption onto zeolites in a standard EN1948-1 sampling device for incinerator emission monitoring

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