Fly ashes from coal gasification applied in the treatment of liquid and gaseous phases

Raupp, Íris Nunes; Filho, Alaor Valério; Rodrigues, Tereza Longaray; Tholozan, Luana Vaz; Luz, Bruno Melo da; Muniz, Ana Rosa Costa; Meili, Lucas; Rosa, Gabriela Silveira da; Almeida, André Ricardo Felkl de

doi:10.1016/b978-0-323-91894-7.00017-7

Cited by 2 publications

(3 citation statements)

References 41 publications

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“…Based on these authors, a lighter sample indicates higher content of UC. The authors of [12] presented a colorimetric analysis of FA, obtaining an L * value of 10.34, which, compared to the value obtained in the present work and according to other literature [12], indicates an increase in UC content after the decantation process. Analyzing the data obtained, it is possible to observe an increase in L * value in the order RC > UC > FA, which is in accordance with another study [49], as this order follows the same tendency of the gasification process, where the raw material (RC) is the lightest, followed by the other products (UC and FA).…”

Section: Characterization Of Ucsupporting

confidence: 82%

“…Some residues are produced by this process, such as ash, which can be classified as fly ash (FA) and bottom ash (BA). The FA are composed of small particles, presenting an average particle size between 3 to 34.57 µm, and are mainly composed of SiO 2 , Al 2 O 3 , Fe 2 O 3 , TiO 2 , CaO, and MgO [8][9][10][11][12][13]. The disposal of FA may be related to economic and environmental problems around the world, and thus researchers have been developing studies regarding its reuse, such as the synthesis of zeolite [12,14,15], development of a catalyst used in the decomposition of NO and NH 3 [16], recovery of gallium and vanadium [17], Zn 2+ , Pb 2+ , As (V), hexavalent chromium and dye…”

Section: Introductionmentioning

confidence: 99%

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Novel Material Obtained from the Gasification Residues of Candiota Mine’s Coal for Cationic Dye Adsorption

LUCENA

Rodrigues

Rosa

et al. 2023

Mining

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This work aims to prepare and characterize the unburned carbon obtained from gasification residues and evaluate its application as an adsorbent for the removal of textile dye contaminants. The results of physical and chemical properties showed a specific mass of 2.05 g/cm3, surface area of 23.983 g/cm2, and diameter and pore volume of 0.844 nm and 2.262 cm3/g, respectively. These properties, along with the point of zero charge and chemical bonds present on the surface, favored the adsorption of cationic dyes. The adsorption results showed great potential for the removal of methylene blue, crystal violet, and basic fuchsin if compared with bromocresol green, and indigo carmine. The maximum removal values obtained for methylene blue were up to 99% and the kinetic adsorption was faster at the beginning of the process, reaching the equilibrium in less than 5 min. The results obtained through the adsorption isotherms showed a maximum adsorption capacity of 333.33 and 476.19 mg/g, at the temperature of 291 and 328 K, respectively. The satisfactory results showed that the use of unburned carbon is a cost-effective and eco-friendly alternative to reusing the residue from gasification and also contributes to the decontamination of watercourses.

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Section: Characterization Of Ucsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Novel Material Obtained from the Gasification Residues of Candiota Mine’s Coal for Cationic Dye Adsorption

LUCENA

Rodrigues

Rosa

et al. 2023

Mining

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“…The production of energy from coal generates significant amounts of waste that can cause a threat to the environment. Despite carbon dioxide (CO 2 ), the emissions are strictly regulated, and the by-product produced during combustion is solid waste known as coal fly ash (CFA) [ 2 ]. Its annual production worldwide is up to 800 Mt.…”

Section: Introductionmentioning

confidence: 99%

Zeolite Composite Materials from Fly Ash: An Assessment of Physicochemical and Adsorption Properties

et al. 2023

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Waste fly ash, with both low (with the addition of vermiculite) and high contents of unburned coal, were subjected to hydrothermal syntheses aiming to obtain zeolite composite materials—zeolite + vermiculite (NaX–Ver) and zeolite + unburned carbon (NaX–C). The composites were compared with parent zeolite obtained from waste fly ash with a low content of unburned carbon (NaX–FA). In this study, the physicochemical characteristics of the obtained materials were evaluated. The potential application of the investigated zeolites for the adsorption of ammonium ions from aqueous solutions was determined. Composite NaX–Ver and parent zeolite NaX–FA were characterized by comparable adsorption capacities toward ammonium ions of 38.46 and 40.00 mg (NH4+) g−1, respectively. The nearly 2-fold lower adsorption capacity of composite NaX–C (21.05 mg (NH4+) g−1) was probably a result of the lower availability of ion exchange sites within the material. Adsorbents were also regenerated using 1 M NaCl solution at a pH of 10 and subjected to 3 cycles of adsorption–desorption experiments, which proved only a small reduction in adsorption properties. This study follows the current trend of waste utilization (fly ash) and the removal of pollutants from aqueous solutions with respect to their reuse, which remains in line with the goals of the circular economy.

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Fly ashes from coal gasification applied in the treatment of liquid and gaseous phases

Cited by 2 publications

References 41 publications

Novel Material Obtained from the Gasification Residues of Candiota Mine’s Coal for Cationic Dye Adsorption

Novel Material Obtained from the Gasification Residues of Candiota Mine’s Coal for Cationic Dye Adsorption

Zeolite Composite Materials from Fly Ash: An Assessment of Physicochemical and Adsorption Properties

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