A Low Temperature Detoxification Method for Treatment of Chrysotile-Containing Waste Roofing Slate

Jo, Hwanju; Jang, Young-Nam; Jo, Jung Hyun

doi:10.3390/min7080144

Cited by 8 publications

(3 citation statements)

References 16 publications

(26 reference statements)

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“…In the heat treatment, the stabilization process, which is generally referred to as a cyclization and dehydrogenation reaction, was conducted at about 300°C in an air environment to ensure thermal resistance to the electrospun PAN nano bers [22]. After the stabilization process, carbonization was carried out at a high temperature of 1000°C to remove noncarbon components before converting them to carbon bers having a carbon content of 95% or more [23,24]. To further improve the speci c surface area of the electrospun carbon nano bers, a physical activation process with CO 2 gas at high temperature was used.…”

Section: Characterization Of Electrospun Carbon Nano Bersmentioning

confidence: 99%

Structural energy storage system using electrospun carbon nanofibers with carbon nanotubes

Lee,

Jung,

Lee

et al. 2023

Polymer Composites

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In the present study, carbon nanofibers containing multi‐walled carbon nanotubes (MWCNTs) were fabricated and employed as electrodes for structural supercapacitors. Carbon nanofibers were utilized as the electrode material in structural supercapacitors to increase the specific surface area. Electrospun polyacrylonitrile (PAN) nanofibers underwent conversion to carbon nanofibers through stabilization and carbonization processes aided by thermal treatment. The specific surface area of the electrospun carbon nanofiber electrodes was further increased approximately 118 times (1946.9 m2/g) using an activation process in comparison with that of non‐activated carbon nanofibers (16.43 m2/g). Multifunctional supercapacitors were fabricated by employing electrospun carbon nanofibers and a vacuum resin infusion technique. The specific capacitance of activated carbon nanofibers (ACNF) and ACNF‐MWCNT exhibited significant improvement (14.87 and 48.25 mF/cm2, respectively) compared to non‐activated carbon nanofibers (CNF‐MWCNT: 1.71 mF/cm2). This improvement was attributed to the reduction in equivalent series resistance and the increase of the surface area of the nanofiber electrodes. Additionally, the carbon nanofiber electrodes contributed to an increased interlaminar fracture toughness of structural supercapacitors, acting akin to “Velcro” between fabric interfaces. This work serves as a “proof of concept” for a straightforward and efficient method to manufacture electrodes for structural supercapacitors based on the electrospinning technique.Highlights Fabrication of carbon nanofibers containing MWCNTs using electrospinning. The carbon nanofiber as an electrode for structural supercapacitors. Simple and effective method. Dramatically improving specific capacitance of the supercapacitors.

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Section: Characterization Of Electrospun Carbon Nano Bersmentioning

confidence: 99%

Structural energy storage system using electrospun carbon nanofibers with carbon nanotubes

Lee,

Jung,

Lee

et al. 2023

Polymer Composites

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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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“…However, because of its carcinogenicity, the use of asbestos is banned in many countries, including the Republic of Korea, Italy, etc., owing to public health concerns. The latency period for asbestos-related diseases is 10-30 years, and asbestos can cause asbestosis, mesothelioma, and lung cancer [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Methods for Pretreatment and Quantification of Bulk Asbestos Samples for Polarized Light Microscopy Analysis to Evaluate Asbestos-Containing Waste

2019

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This study aimed to compare sample pretreatment procedures for the identification and quantification of asbestos. The performance of visual estimation and point counting procedures for evaluating asbestos-containing waste was investigated, and the effect of analytical experience was studied. The efficacy of pretreatments for the identification and quantification of asbestos in various sample matrices was compared. To evaluate the effect of experience on analytical accuracy, three analysts with different analytical experiences were selected. There were significant differences in the quantitative analysis results obtained using different pretreatments. False negatives were reported when asbestos, especially amphiboles, were analyzed by a less-experienced analyst. Quantification via point counting and visual estimation resulted in differences in the asbestos content. The results of point counting were more accurate than those of visual estimation for all analysts, regardless of the asbestos type and concentration. Experience in asbestos analysis affected accuracy and precision. The findings show that pretreatment is an important factor in qualitative analysis. Appropriate pretreatments should be assigned based on the properties of the sample. For quantitative analysis, the accuracy of the results depends on the experience of the analyst. Until analysts are fully trained, all their analysis results should be checked by an experienced analyst. Point counting is an adequate quantitative method for analyzing samples with low concentrations.

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A Low Temperature Detoxification Method for Treatment of Chrysotile-Containing Waste Roofing Slate

Cited by 8 publications

References 16 publications

Structural energy storage system using electrospun carbon nanofibers with carbon nanotubes

Structural energy storage system using electrospun carbon nanofibers with carbon nanotubes

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

Comparison of Methods for Pretreatment and Quantification of Bulk Asbestos Samples for Polarized Light Microscopy Analysis to Evaluate Asbestos-Containing Waste

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