2016
DOI: 10.1016/j.jhazmat.2015.11.036
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Chrysotile asbestos detoxification with a combined treatment of oxalic acid and silicates producing amorphous silica and biomaterial

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Cited by 34 publications
(13 citation statements)
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“…The bands at 3459 and 1640 cm À1 are associated with water molecules absorbed or adsorbed on chrysotile fibers (Wypych et al, 2004). The bands at 1077 and 955 cm À1 were attributed to the symmetric stretching vibration of Si-O-Si and Si-O bonds of the mineral's tridymite layer, while the band at 613 cm À1 is attributed to the internal vibration of the Mg-O bond (Wypych et al, 2005;Valouma et al, 2016). In the infrared spectrum of (cri/H 3 PO 4 1:3) 2 , note the absence of the bands of the brucite layer, and the presence of an intense broad band between 3600 and 3200 cm À1 .…”
Section: Characterization Of the Adsorbentsmentioning
confidence: 99%
See 1 more Smart Citation
“…The bands at 3459 and 1640 cm À1 are associated with water molecules absorbed or adsorbed on chrysotile fibers (Wypych et al, 2004). The bands at 1077 and 955 cm À1 were attributed to the symmetric stretching vibration of Si-O-Si and Si-O bonds of the mineral's tridymite layer, while the band at 613 cm À1 is attributed to the internal vibration of the Mg-O bond (Wypych et al, 2005;Valouma et al, 2016). In the infrared spectrum of (cri/H 3 PO 4 1:3) 2 , note the absence of the bands of the brucite layer, and the presence of an intense broad band between 3600 and 3200 cm À1 .…”
Section: Characterization Of the Adsorbentsmentioning
confidence: 99%
“…Therefore, it is also used as feedstock for the production of silica, which is obtained after leaching the brucite layer with an acid solution. This silica, which has a large surface area, high porosity, and abundant acid sites, can be used an as an adsorbent in the production of zeolites and as a catalyst support (Valouma et al, 2016). Liu et al (2007) produced and characterized amorphous silica nanowires made from acid-leached chrysotile.…”
Section: Introductionmentioning
confidence: 99%
“…However, since it has low chrysotile contents, it is considered a hazardous waste and its disposal represents a challenge for environmental engineering and public health [1][2][3][4][5]. According to Valuoma et al [5], Fedoročková et al [6], and Gadikota et al [1], carbon capture and storage by mineralization (CCSM) using asbestos-containing materials is a technology that would have several environmental benefits, since it can permanently alter the asbestos fiber structure in these materials, as well as sequester carbon dioxide (CO 2 ) in a safe and permanent manner, producing materials with high aggregated value in the market. This would avoid disposal issues normally associated to these mining wastes [7].…”
Section: Introductionmentioning
confidence: 99%
“…However, thermal treatment requires vast amounts of energy for decomposition or melting of asbestos, due to the material's high heat resistance. Chemical detoxification methods using H 2 SO 4 [12], FSO 3 H [13], CHClF 2 -decomposed acidic gas [14], re-used supernatant from fly ash treatment [15], and H 2 C 2 O 4 [16][17][18] could also effectively decompose asbestos materials. Strong acids, such as sulfuric acid (H 2 SO 4 ), hydrochloric acid (HCl), and hydrofluoric acid (HF), have been extensively investigated as decomposition agents for asbestos detoxification treatments.…”
mentioning
confidence: 99%
“…It was shown that, of the three, oxalic acid has the highest leaching and destruction efficiency. Valouma et al [18] investigated combined chrysotile asbestos detoxification methods using various combinations of oxalic acid, tetraethoxysilane (TEOS) (SiH 20 C 8 O 4 ), and pure water glass. The proposed detoxification methods decomposed asbestos effectively and produced amorphous silica and glushinskite (MgC 2 O 4 ·2H 2 O).…”
mentioning
confidence: 99%