EPR study of the adsorption of dioxin vapours onto microporous carbons and mesoporous silica

Ottaviani, M. Francesca; Mazzeo, Roberto; Turro, Nicholas J.; Lei, Xuegong

doi:10.1016/j.micromeso.2010.10.040

Cited by 11 publications

(9 citation statements)

References 19 publications

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“…At higher P/P 0 (e.g., P/P 0 > 0.25), we observed that the 62.5 wt% materials display better DCB adsorption properties than Lignite HOK ® -Super. This behavior has been previously described in a study comparing dioxin adsorption properties of commercial microporous activated carbons (NORIT ® GL 50 and EVN.2) and mesoporous MTS (micelle-templated silicas) materials [28]. Thus, microporosity seems to have a positive influence on low-pressure adsorption of organic pollutant like dioxin whereas mesoporosity promotes high adsorption at higher relative pressure.…”

Section: Resultssupporting

confidence: 57%

From waste incineration by-products to functional materials: a “Chimie douce” route to VOCs mineral adsorbents

Corbin

Guichaoua

Baradari

et al. 2022

J Sol-Gel Sci Technol

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One of today’s major world challenges is the accumulation and the storage of tens of millions of tons per year of final materials resulting from the incineration of domestic and industrial waste. This raises the question of the recycling of these “raw materials”, while making allowance for environmental, economic, social and public health aspects. Our strategy targets the incorporation of waste incineration by-products in a totally circular economy. We propose an innovative process combining templated sol–gel growth of an inorganic or hybrid silica-based network with a solubilized fraction of bottom ash coming from the combustion of industrial and household wastes. The resulting materials engineered via aerosol processing demonstrate maximum adsorption capacity of model pollutant compounds (1-2 dichlorobenzene) competitive with activated carbons currently used in modern incineration plants. We believe that they have the potential to replace conventional activated carbon commonly used in incineration plants, enabling the first step of the long road of recycling final waste.

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Section: Resultssupporting

confidence: 57%

From waste incineration by-products to functional materials: a “Chimie douce” route to VOCs mineral adsorbents

Corbin

Guichaoua

Baradari

et al. 2022

J Sol-Gel Sci Technol

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“…In all cases, a bowl-ended Pyrex tube containing the sample was connected to the vaccum system via a glass metal fitting flange. Samples were measured following pre-evacuation (6)(7)(8)(9)(10) between room temperature and up to 300 1C, the temperature of full dryness, and the evacuation was continued for 2 h. N 2 and CO 2 adsorption isotherms of various coals were performed at 77 K and 196 K, respectively, utilizing pressures in the range of 1-1000 Torr, measured using a highly sensitive pressure transducer (Sensotec, model Super TJE, 0.05% FS), calibrated to an accuracy of 0.1 Torr. Initially, volume calibration was performed with He (UHP grade) at 77 K (by immersion in LN2) and at 196 K (by immersion in dry ice with ethanol bath).…”

Section: Surface Measurementsmentioning

confidence: 99%

“…5 While EPR studies regarding the effects of oxidation on the structure and stability of carbon radicals date back to the early 1980's the focus of these early reports primarily characterized the changes to the structures under extremely harsh conditions (pH or temperature). [6][7][8] It is also known that paramagnetic molecular oxygen undergoes a Heisenberg spin exchange interaction with stable radicals that extremely broadens the EPR signal. [9][10][11] Recently, the nature of the carbon radicals stabilized in various coals as a function of the oxidation time was characterized.…”

Section: Introductionmentioning

confidence: 99%

Elucidating the role of stable carbon radicals in the low temperature oxidation of coals by coupled EPR–NMR spectroscopy – a method to characterize surfaces of porous carbon materials

Green

Keinan‐Adamsky

Attia

et al. 2014

Phys. Chem. Chem. Phys.

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Recently, the nature of the carbon radicals stabilized in various coals was characterized using Electron Paramagnetic Resonance (EPR) spectroscopy. It was demonstrated that introducing diamagnetic gases, such as He, CO2, or N2, under STP conditions to the coal surface induces the appearance of a new type of carbon surface radical. This interesting phenomenon was not observed for all coal types, which suggests that the use of EPR measurements can provide information on functional groups that exist on the carbon surface. In the current study coupling Nuclear Magnetic Resonance (NMR) with gas flow in situ EPR measurements significantly enhances the ability to characterize the nature of these radicals and the surface functional groups of coal samples. It was observed that the oxidative reaction with aliphatic groups leads to the increase in stable carbon centered radicals. In addition, there are some species of carbon centered radicals that show reversible binding to O2. This phenomena, however, is dependent on the coal rank, sample porosity and the degree of the coal sample to undergo structural changes under the LTO process. These findings shed new light onto the complex heterogeneous low temperature oxidation reactions occurring at the coal surface.

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“…It is important to state that extreme experimental conditions such as high temperatures and strongly acidic conditions, particularly those used by Ottaviani et al, have previously been reported [14][15][16] to induce similar effects on carbon EPR spectra.…”

mentioning

confidence: 96%

Reducing the spin–spin interaction of stable carbon radicals

Green

Aizenshtat

Ruthstein

et al. 2013

Phys. Chem. Chem. Phys.

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EPR study of the adsorption of dioxin vapours onto microporous carbons and mesoporous silica

Cited by 11 publications

References 19 publications

From waste incineration by-products to functional materials: a “Chimie douce” route to VOCs mineral adsorbents

From waste incineration by-products to functional materials: a “Chimie douce” route to VOCs mineral adsorbents

Elucidating the role of stable carbon radicals in the low temperature oxidation of coals by coupled EPR–NMR spectroscopy – a method to characterize surfaces of porous carbon materials

Reducing the spin–spin interaction of stable carbon radicals

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