Virtuous cycle of destruction and total recycling of pure asbestos and asbestos-containing waste

Talbi, Gaël; Cambon, M.; Cambon, O.

doi:10.1007/s10163-019-00870-0

Cited by 12 publications

(7 citation statements)

References 24 publications

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“…The silica nanotubes were prepared by treating pure chrysotile fibers with a nitric acid solution 21 . The resulting nanotubes were washed with distilled water and dried in air at 600 °C for 12 hours to remove water and hydroxyl groups from the internal silica walls of the nanotubes.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Silica nanotubes are an interesting candidate as an insulating host material. Narrow silica nanotubes with inner diameters of between 4-6 nm can be obtained from acid treatment of chrysotile 19,20 followed by heating 21,22 . In the present study, phenylacetylene was inserted in silica nanotubes under high pressure and high-pressure, high-temperature conditions were used to form the polymer.…”

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confidence: 99%

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Synthesis of a polyphenylacetylene/silica nanotube composite under high-temperature, high-pressure conditions

Fabbiani¹,

Rouquette²,

Talbi³

et al. 2022

Can. J. Chem.

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Phenylacetylene was inserted and polymerized in 5 nm diameter silica nanotubes under high pressure – high temperature conditions of 0.5 GPa and 437 K in an inert gas. The resulting nanocomposite was characterized by infrared and Raman spectroscopy and scanning and transmission electron microscopy. The vibrational spectroscopic data confirmed the formation of π-conjugated polyphenylacetylene and the absence of crystallization of the amorphous nanotubes. Scanning transmission electron microscopy coupled with energy dispersive x-ray spectroscopy, STEM-EDX, measurements confirmed the insertion of the polymer in the channels of the nanotubes and electron diffraction confirmed the amorphous nature of both the polymer and the host SiO2 nanotubes. The obtained nanocomposite is a candidate material for gas sensing applications. Du phénylacétylène a été inséré puis polymérisé dans des nanotubes de silice de diamètre 5nm dans de conditions de haute pression 0,5 GPa et haute température 437K. Le nanocomposite obtenu a été caractérisé par spectroscopies infrarouge et Raman et par microscopies électronique à balayage et en transmission. Les données de spectroscopie vibrationnelle ont confirmé la formation de polyphénylacétylène π-conjugué ainsi que l’absence de cristallisation des nanotubes amorphes. La microscopie électronique en transmission à balayage, couplée à la spectroscopie des rayons X en dispersion d’énergie a confirmé l’insertion du polymère à l’intérieur des canaux des nanotubes. La diffraction électronique a confirmé la nature amorphe du polymère et des nanotubes de SiO2 hôte. Le nanocomposite est un candidat comme matériau pour les capteurs de gaz.

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Section: Experimental Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Synthesis of a polyphenylacetylene/silica nanotube composite under high-temperature, high-pressure conditions

Fabbiani¹,

Rouquette²,

Talbi³

et al. 2022

Can. J. Chem.

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“…The AC used in this study was obtained from the Center for Studies and Training in Asbestos and Chemical Safety (CEFASC ENVIRONNEMENT) and consisted of chrysotile associated with a cement matrix. Scanning Electron Microscopy (SEM) was performed on AC waste as described in Talbi et al (2019). This analysis method was coupled with Energy Dispersive X-ray (EDX) to determine the chemical composition of the samples.…”

Section: Asbestos Waste Preparationmentioning

confidence: 99%

Biodeterioration of asbestos cement by siderophore-producing Pseudomonas

David

Jaouen

Ihiawakrim

et al. 2021

Journal of Hazardous Materials

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Since the ban on the use of asbestos due to its carcinogenic properties, the removal of asbestos cement, representing the major asbestos-containing waste, has proven to be a challenge in most industrial countries. Asbestos-containing products are mainly disposed of in landfills and have remained untreated. Bioremediation involving bacteria previously reported the ability of Pseudomonas aeruginosa to release iron from flocking asbestos waste through a siderophore-driven mechanism. We examined the involvement of siderophore-producing Pseudomonas in the biodeterioration of asbestos cement. Iron and magnesium solubilization were evaluated by specific siderophore-producing mutants. The absence of one of the two siderophores affected iron extraction, whereas equivalent dissolution as that of the control was observed in the absence of siderophore. Both pyoverdine and pyochelin biosynthesis was repressed in the presence of asbestos cement, suggesting iron bioavailability from the waste.We compared the efficiency of various pyoverdines to scavenge iron from asbestos cement waste that revealed the efficiency of all pyoverdines. Pyoverdines were efficient in iron Revised Manuscript Texte removal extracted continuously, with no evident extraction limit, in long-term weathering experiments with these pyoverdines. The optimization of pyoverdine-asbestos weathering may allow the development of a bioremediation process to avoid the disposal of such waste in landfills.

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“…As a consequence, many chrysotile waste treatments by acid attack have been proposed. As an example, the use of strong acids such as hydrochloric acid [36,37], sulfuric acid [38] or nitric acid [39] were used to treat waste. Other studies propose the use of weaker acids to overcome the problems of acid management, with the use of organic acids such as oxalic [40,41], acetic or formic acid [9].…”

Section: Asbestos Treatment Technologiesmentioning

confidence: 99%

A Review of Asbestos Bioweathering by Siderophore-Producing Pseudomonas: A Potential Strategy of Bioremediation

David

Geoffroy

2020

Microorganisms

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Asbestos, silicate minerals present in soil and used for building constructions for many years, are highly toxic due primarily to the presence of high concentrations of the transition metal iron. Microbial weathering of asbestos occurs through various alteration mechanisms. Siderophores, complex agents specialized in metal chelation, are common mechanisms described in mineral alteration. Solubilized metals from the fiber can serve as micronutrients for telluric microorganisms. The review focuses on the bioweathering of asbestos fibers, found in soil or manufactured by humans with gypsum (asbestos flocking) or cement, by siderophore-producing Pseudomonas. A better understanding of the interactions between asbestos and bacteria will give a perspective of a detoxification process inhibiting asbestos toxicity.

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Virtuous cycle of destruction and total recycling of pure asbestos and asbestos-containing waste

Cited by 12 publications

References 24 publications

Synthesis of a polyphenylacetylene/silica nanotube composite under high-temperature, high-pressure conditions

Synthesis of a polyphenylacetylene/silica nanotube composite under high-temperature, high-pressure conditions

Biodeterioration of asbestos cement by siderophore-producing Pseudomonas

A Review of Asbestos Bioweathering by Siderophore-Producing Pseudomonas: A Potential Strategy of Bioremediation

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