Determination of equilibrium constants of iron(<scp>iii</scp>)-1,2-dihydroxybenzene complexes and the relationship between calculated iron speciation and degradation of rhodamine <i>B</i>

Henríquez, Adolfo; Salgado, Pablo; Albornoz, Milenka; Melín, Victoria; Mansilla, Héctor D.; Cornejo-Ponce, Lorena; Contreras, David

doi:10.1039/d1nj01579f

Cited by 5 publications

(1 citation statement)

References 21 publications

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“…The use of H 2 O 2 in the process previously described is highly significant, with levels ranging from 2 to 3 mol L −1 . However, in photoleaching processes, such high concentrations are not necessary; instead, levels similar to those used in Fenton and photo-Fenton processes are used [34]. In addition, through Fenton and photo-Fenton mechanisms, H 2 O 2 plays a crucial role in photoleaching as a precursor of ROS radicals, particularly the hydroxyl radical (HO • ).…”

Section: Improving Acid Leaching Through the Synergistic Action Of H 2 Omentioning

confidence: 99%

Perspectives for Photochemical Leaching Processes of Chalcopyrite: A Solar Radical-Leaching Process

Yepsen,

Cornejo-Ponce,

Yepsen

2024

Mining

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This paper review presents a comparison between conventional leaching and advanced photochemical leaching processes and their potential for use in chalcopyrite leaching. Likewise, it presents an analysis of the differences between the advanced leaching processes, photoleaching and radical-leaching, indicating that the photochemical mechanisms (photooxidation/photoreduction and generation of radical oxygen species (ROS) and radical sulfur species (RSS)) would improve the oxidative dissolution of chalcopyrite, taking advantage of the high oxidizing power of free radicals. Initial experimental results of solar-assisted radical-leaching on chalcopyrite are presented, demonstrating that sulfate radicals (SO4−) allow copper to be leached at a rate 4.7 times higher than in the absence of radicals and sunlight. With these results, a radical-leaching process is presented for the first time, with a perspective toward the future development of a new hydrometallurgical route: solar-assisted radical-leaching.

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Section: Improving Acid Leaching Through the Synergistic Action Of H 2 Omentioning

confidence: 99%

Perspectives for Photochemical Leaching Processes of Chalcopyrite: A Solar Radical-Leaching Process

Yepsen,

Cornejo-Ponce,

Yepsen

2024

Mining

Self Cite

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Progress in copper-based supported heterogeneous electro-Fenton catalysts

Liu,

Kong,

Liu

et al. 2024

Chemical Engineering Journal

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Overlooked role of protocatechuic acid in enhancing the selective elimination of sulfonamide antibiotics in Fe(III)/peroxymonosulfate process under actually neutral pH conditions

Li,

Zou,

et al. 2024

Chemical Engineering Journal

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Determination of equilibrium constants of iron(iii)-1,2-dihydroxybenzene complexes and the relationship between calculated iron speciation and degradation of rhodamine B

Abstract: The Advanced Oxidation Process (AOPs) are chemical systems characterized by the production of hydroxyl radicals and other reactive oxygen species. One of the most important AOPs systems are Fenton and...

Cited by 5 publications

References 21 publications

Perspectives for Photochemical Leaching Processes of Chalcopyrite: A Solar Radical-Leaching Process

Perspectives for Photochemical Leaching Processes of Chalcopyrite: A Solar Radical-Leaching Process

Progress in copper-based supported heterogeneous electro-Fenton catalysts

Overlooked role of protocatechuic acid in enhancing the selective elimination of sulfonamide antibiotics in Fe(III)/peroxymonosulfate process under actually neutral pH conditions

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