Coal mining pyritic waste in Fenton-like processes: Raw and purified catalysts in Reactive Blue 21 dye discoloration.

Autor: Cechinel MAP; Department of Chemical Engineering, Universidade do Extremo Sul Catarinense, Brazil; Laboratório de Cerâmica Técnica (CerTec), Programa de Pós-graduação em Ciência e Engenharia de Materiais, Universidade do Extremo Sul Catarinense, Brazil; Grupo de Biomateriais e Materiais Nanoestruturados, Programa de Pós-Graduação em Ciência e Engenharia de Materiais (PPGCEM), Universidade do Extremo Sul Catarinense, Av. Universitária 1105, Criciúma 88806-000, Brazil. Electronic address: maria.cechinel@unesc.net., de Oliveira Guidolin T; Department of Chemical Engineering, Universidade do Extremo Sul Catarinense, Brazil; Laboratório de Cerâmica Técnica (CerTec), Programa de Pós-graduação em Ciência e Engenharia de Materiais, Universidade do Extremo Sul Catarinense, Brazil., da Silveira AR; Department of Chemical Engineering, Federal University of Santa Catarina, PO Box 476, CEP 88040-900 Florianópolis, SC, Brazil., Dos Santos Tasca J; Department of Chemical Engineering, Universidade do Extremo Sul Catarinense, Brazil., Montedo ORK; Laboratório de Cerâmica Técnica (CerTec), Programa de Pós-graduação em Ciência e Engenharia de Materiais, Universidade do Extremo Sul Catarinense, Brazil; Grupo de Biomateriais e Materiais Nanoestruturados, Programa de Pós-Graduação em Ciência e Engenharia de Materiais (PPGCEM), Universidade do Extremo Sul Catarinense, Av. Universitária 1105, Criciúma 88806-000, Brazil., Arcaro S; Laboratório de Cerâmica Técnica (CerTec), Programa de Pós-graduação em Ciência e Engenharia de Materiais, Universidade do Extremo Sul Catarinense, Brazil; Grupo de Biomateriais e Materiais Nanoestruturados, Programa de Pós-Graduação em Ciência e Engenharia de Materiais (PPGCEM), Universidade do Extremo Sul Catarinense, Av. Universitária 1105, Criciúma 88806-000, Brazil.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2022 Feb 10; Vol. 807 (Pt 2), pp. 150823. Date of Electronic Publication: 2021 Oct 07.
DOI: 10.1016/j.scitotenv.2021.150823
Abstrakt: Raw pyritic waste (RPW) from South Brazilian coal deposits and pure pyritic waste (PPW) were used as catalysts for organic dyes discoloration. Samples were characterized for their chemical, morphological, and structural properties. There was a significant content of Fe and S in both samples from the presence of iron sulfide. The average particle size is 10.9 μm for RPW and 7.4 μm for PPW, demonstrating that the beneficiation process could remove the larger quartz particles, interfered in the distribution, and average particle size. Smaller particle sizes promoted a larger surface area for the PPW. The influence of the pyritic waste in dosage, H 2 O 2 concentration, and pH was evaluated, obtaining discoloration values above 95% for 0.5 g/L of pyritic waste, 2 g/L of H 2 O 2, and pH 4.3 for both pyritic wastes. The degradation kinetics of the Reactive Blue 21 using the raw pyritic waste obtained a dye concentration removal above 93% in 90 min, with an iron release of 5.4 mg/L into the solution. Using PPW, the dye concentration removal was over 92% in 40 min, with the iron release of 15.5 mg/L into the solution. Discoloration rate for the PPW sample is 7 times greater than the rate obtained for RPW, indicating a faster decay rate for the purified sample. A decrease in discoloration efficiency is observed for PPW after 6 cycles of use, due to the higher concentration of iron leached into the medium. From the results, it was concluded that the raw pyritic waste has excellent potential for use as a catalyst for Fenton reaction, especially for dye-containing water discoloration, thus demonstrating the excellent applicability potential of pyritc waste in the degradation of organic pollutants in wastewater.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2021 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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