Kinetic Analysis of the Decomposition of the KFe3(SO4)2-x(CrO4)x(OH)6Jarosite Solid Solution in Ca(OH)2Medium

Mireles, Ister; Reyes, Iván A.; Flores, Víctor Hugo Portilla; Patiño, Francisco; Flores, Mizraím U.; Reyes, Martín; Acosta, M.; Cruz, Roel; Gutiérrez, Emmanuel J.

doi:10.5935/0103-5053.20150357

Cited by 6 publications

(9 citation statements)

References 37 publications

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“…Additionally, synthesis of jarosite particles with very small diameters, close to nanometric values, were reported but with the disadvantage that it is necessary the presence of other agents such as potassium fluoride, δ-MnO2 nanosheets and other variables in addition to the traditional wet chemical synthesis method [14,23,24]. Until now, different synthesis methods have been developed with different synthesis parameters for obtaining jarosite structures, but wet chemical synthesis method is the most simple, precise and cost-effective method for obtaining size and morphology controlled jarosite micro structures [13].…”

Section: Introductionmentioning

confidence: 83%

“…It can be found in acidic sulfate soils, oxidized zones of sulfur mineral deposits, hydrometallurgical systems, bioleaching systems and in environments contaminated by acid mine drainage [11]. Also, it has been proven that jarosite type-compounds are better absorbents of dangerous wastes in comparison with other minerals for the elimination of toxic metals due to the presence of these toxic elements in the crystalline structure of the jarosite type-compounds [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…Wide range of researchers carried out experiments to synthesize jarosite under laboratory conditions (synthetic jarosite) where the principal characteristics employed during the synthesis were high synthesis temperatures (> 363 K) and time (> 24 h) [2][3][4][5]. For example, alkaline decomposition of the jarosite type-compounds obtained with the synthesis temperatures between 366 and 371 K and time ̴ 24 h was executed, where the obtained particles sized where from 20 to 80 µm in diameter [13,[19][20][21][22]. Additionally, synthesis of jarosite particles with very small diameters, close to nanometric values, were reported but with the disadvantage that it is necessary the presence of other agents such as potassium fluoride, δ-MnO2 nanosheets and other variables in addition to the traditional wet chemical synthesis method [14,23,24].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Hydronium-Potassium Jarosite; Effect of pH and Aging Time on their Structural, Morphological and Electrical Properties

Hernández-Lazcano¹,

Cerecedo‐Sáenz²,

Hernández-Ávila³

et al. 2020

Preprint

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Structural and morphological properties of the hydronium-potassium jarosite microstructures were investigated in this work, and their electrical properties were evaluated. All microstructures were synthesized at a reasonable temperature of 343 K with a reduced reaction time of 3 hours. Increase in the pH from 0.8 to 2.1 decreased the particle sized from 3 µm to 200 nm and increasing the aging time from 0, 3 to 7 days resulted in semispherical, spherical and euhedreal jarosite structures, respectively. A Rietveld analysis also was done, finding that increasing pH, the amount of hydronium substitution by potassium in the cationic site also increases, having a 77.72 % of hydronium jarosite (JH) plus 22.29 % potassium jarosite (JK) at pH 0.8; 82.44 % (JH) and 17.56 % (JK) at pH 1.1, and 89.98 % (JH) plus 10.02 % (JK) at pH 2.1. The results obtained in this work show that the obtained hydronium potassium jarosite microstructures with reduced particle size and euhedreal morphology can be used as anode materials for improving the life time of lithium ion batteries, due that during the analysis of the voltage obtained using electrodes made with this particles and graphite, this ranged from 0.89 to 1.36 V.

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Section: Introductionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis of Hydronium-Potassium Jarosite; Effect of pH and Aging Time on their Structural, Morphological and Electrical Properties

Hernández-Lazcano¹,

Cerecedo‐Sáenz²,

Hernández-Ávila³

et al. 2020

Preprint

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“…The concentration of heavy metals in the tailings and waste is also conditioned to the mineralogical composition of the coal that brings with it different metallic ions. Brazilian coal is characterized by a high range of sulphide minerals such as pyrite, marcasite and secondary minerals, formed from the AMD process, such as jarosite and schwertmannite, which can assimilate elements such as Pb, As and Cr (Oliveira et al 2019;Mireles et al 2016). The oxidation of other iron sulphides, such as pyrrhotite (FeS), arsenopyrite (AsFeS) and chalcopyrite (CuFeS 2 ), can also generate acidic solutions and provide toxic elements.…”

Section: Discussionmentioning

confidence: 99%

Ferns and Licophytes in Coal Mining Waste and Tailing Landfills

Andreola

Rosini

Campos

et al. 2021

Preprint

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Mineral coal extraction in Santa Catarina State (Brazil) Carboniferous Basin has degraded the local ecosystem, restricting the use of its areas. One of the biggest environmental impacts in the mining areas is the uncontrolled disposal of waste and sterile mining with high concentrations of pyrite, which in the presence of air and water is oxidized promoting the formation of acid mine drainage (AMD). These contaminants can be leached into water resources, restrict the use of water, soil and cause threats to fauna and flora. This study aimed to characterize these areas as to the content of Cd, Pb, Ni and Zn metals in the tailings and waste resulting from coal mining and to survey the species of ferns and lycophytes present. Wastes and tailing samples and specimens of ferns and lycophytes were collected in 23 landfills in six municipalities in the region and in four underlying areas used as controls. Chemical and physical analyses (pH in water and pH in KCl, Ca, Mg, P, K, Na, Mn, Fe, Al, clay and OM contents) were carried out and the total contents of heavy metals Cd, Pb were determined, Ni and Zn. Sampling of ferns and lycophytes was carried out by walking. The levels of heavy metals, Cd, Ni and Zn were below the prevention concentrations established by CONAMA Resolution 420/2009. Pb levels were above prevention values in four landfills. Sixteen species of ferns and one lycophyte were found, with hemicryptophytes the most frequent and helophytes the most adapted to the environment. Of the species found, Pteridium esculentum (G. Forst.) Cockayne, Pityrogramma calomelanos (L.) Link and Telmatoblechnum serrulatum (Rich.) Perrie, DJ Ohlsen & Brownsey demonstrated resistance to degraded and contaminated environments with Pb, which may constitute an alternative for projects monitoring and environmental recovery.

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“…In the literature, only mention is made of studies that describe its formation properties and to date there is no precedent about the behavior and stability of this compound in contact with neutralizing chemical agents, since the most used method to mitigate acid effluent and soils is the addition of neutralizing agents, lime being the most commonly used compound. The use of neutralizing agents in acidic environments can affect the stability of jarosite, resulting in a potentially hazardous environment, because after decomposition, Hg can be released from the structure of the jarosite in a bioavailable form into ecosystems . For this reason, it is important to know the behavior of this type of compound under alkaline conditions; using sodium hydroxide allows to provide an interference‐free kinetic analysis in the decomposition reaction.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Analysis of the Decomposition Reaction of the Mercury Jarosite in NaOH Medium

Ordoñez

Flores

Patiño

et al. 2017

Int. J. Chem. Kinet.

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This work presents the kinetic study of the decomposition in NaOH medium of mercury jarosite whose approximate formula is [Hg 0.39 (H 3 O) 0.22 ]Fe 2.71 (SO 4 ) 2.17 (OH) 4.79 (H 2 O) 2.09 . The reaction progress takes place on the surface of the compound with diffusion of the hydroxyl ions (OH − ) from the solution to the particle surface moving the reaction front toward the interior of the particle, with the release of ions SO 4 2and Hg 2+ from the core to the reaction medium. The decomposition curve can be described by three kinetics stages: an induction period followed by a progressive conversion period and ending the reaction in the stabilization zone. The results of X−ray diffraction showed that as the decomposition reaction progresses the partially decomposed solids lost its crystallinity ending as amorphous solids. For the induction period, the reaction order (n) was 0.52 for [OH − ] < 0.0187 mol L −1 and when [OH − ] > 0.0187 mol L −1 n = 1.48, whereas the calculated activation energy (E a ) was 81.7 kJ mol −1 . For the progressive conversion period n = 0.99 for [OH − ] > 0.0057 mol L −1 and for lower concentrations n 0, with E a = 56.9 kJ mol −1 , confirming that the decomposition process is controlled by the chemical reaction. Based on the calculated kinetic parameters, the partial

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Kinetic Analysis of the Decomposition of the KFe₃(SO₄)_2-x(CrO₄)_x(OH)₆Jarosite Solid Solution in Ca(OH)₂Medium

Cited by 6 publications

References 37 publications

Synthesis of Hydronium-Potassium Jarosite; Effect of pH and Aging Time on their Structural, Morphological and Electrical Properties

Synthesis of Hydronium-Potassium Jarosite; Effect of pH and Aging Time on their Structural, Morphological and Electrical Properties

Ferns and Licophytes in Coal Mining Waste and Tailing Landfills

Kinetic Analysis of the Decomposition Reaction of the Mercury Jarosite in NaOH Medium

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