Environmental challenges related to cyanidation in Central American gold mining; the Remance mine (Panama)

González-Valoys, Ana Cristina; Arrocha, Jonatha; Monteza-Destro, Tisla; Vargas-Lombardo, Miguel; Esbrí, José María; García-Ordiales, Efrén; Jiménez‐Ballesta, Raimundo; García-Navarro, Francisco Jesús; Higueras, Pablo

doi:10.1016/j.jenvman.2021.113979

Cited by 17 publications

(11 citation statements)

References 41 publications

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“…Li et al Cyanide is widely found in nature and has a variety of uses. It is indispensable in industry, mining, and organic synthesis [134,135]. However, cyanide is highly toxic: CN − has super complex ability to heavy metal ions, can combine with intracellular metal ions, or destroy the human respiratory chain and other physiological functions by inhibiting enzyme activity, endangering life.…”

Section: Etchant Detectionmentioning

confidence: 99%

An Overview on Coinage Metal Nanocluster-Based Luminescent Biosensors via Etching Chemistry

Shu

et al. 2022

Biosensors

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The findings from the synthetic mechanism of metal nanoclusters yield the etching chemistry based on coinage metal nanoclusters. The utilization of such chemistry as a tool that can alter the optical properties of metal nanoclusters has inspired the development of a series of emerging luminescent biosensors. Compared with other sensors, the luminescent biosensors have the advantages of being more sensitive, saving time and saving cost. We reviewed topics on the luminescent sensors based on the etching of emissive coinage metal nanoclusters. The molecules possessing varied etching ability towards metal nanoclusters were categorized with discussions of corresponding etching mechanisms. The understanding of etching mechanisms favored the discussions of how to use etching methods to detecting biochemical molecules. The emerging luminescent biosensors via etching chemistry also provided challenges and new opportunities for analytical chemistry and sensors.

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Section: Etchant Detectionmentioning

confidence: 99%

An Overview on Coinage Metal Nanocluster-Based Luminescent Biosensors via Etching Chemistry

Shu

et al. 2022

Biosensors

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“…Cyanides are highly toxic chemical compounds that can cause severe harm to health and the environment [ 1 ]. The most common cyanide compounds in the environment are present both in their free form, which comprises the cyanide ion itself (CN − ) and hydrogen cyanide (HCN), and as water-soluble inorganic salts, including sodium cyanide (NaCN) and potassium cyanide (KCN) [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Doping TiO2 NPs with Lanthanides (La, Ce and Eu) on the Adsorption and Photodegradation of Cyanide—A Comparative Study

Jaramillo-Fierro

León

2023

Nanomaterials

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Free cyanide is a highly dangerous compound for health and the environment, so treatment of cyanide-contaminated water is extremely important. In the present study, TiO2, La/TiO2, Ce/TiO2, and Eu/TiO2 nanoparticles were synthesized to assess their ability to remove free cyanide from aqueous solutions. Nanoparticles synthesized through the sol–gel method were characterized by X-ray powder diffractometry (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), Fourier-transformed infrared spectroscopy (FTIR), diffuse reflectance spectroscopy (DRS), and specific surface area (SSA). Langmuir and Freundlich isotherm models were utilized to fit the adsorption equilibrium experimental data, and pseudo-first-order, pseudo-second-order, and intraparticle diffusion models were used to fit the adsorption kinetics experimental data. Cyanide photodegradation and the effect of reactive oxygen species (ROS) on the photocatalytic process were investigated under simulated solar light. Finally, reuse of the nanoparticles in five consecutive treatment cycles was determined. The results showed that La/TiO2 has the highest percentage of cyanide removal (98%), followed by Ce/TiO2 (92%), Eu/TiO2 (90%), and TiO2 (88%). From these results, it is suggested that La, Ce, and Eu dopants can improve the properties of TiO2 as well as its ability to remove cyanide species from aqueous solutions.

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“…1,2 The high resistance of elemental gold to chemical attack requires it to be processed with especially harsh, aggressive, and toxic methods that require specialized equipment, safety precautions, and careful waste management. [3][4][5] These methods ranges from hot aqua regia (3:1 mixture of concentrated hydrochloric or hydrobromic acid and nitric acid) at academic and small industrial scales, or on larger industrial scales, to molten alkali metal fusions, alkaline cyanidation, and high temperature chlorination. [6][7][8] All these methods produce water-soluble Au(I) or Au (III) species that are readily transformed back to elemental gold via chemical or thermal reduction or electrolysis.…”

Section: Introductionmentioning

confidence: 99%

Quantitative, room‐temperature, solvent-free mechanochemical oxidation of elemental gold into organosoluble gold salts

Auvray

Lennox

et al. 2022

Preprint

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Gold is highly valued for its wide-ranging commercial and technological use and is currently almost exclusively processed via aggressive reaction conditions that produce water soluble salts. Oxidative mechanochemistry has previously been shown as a rapid, mild, and room-temperature alternative for chemically activating and transforming gold into water soluble species in the presence of potassium and ammonium halides. Demonstrated here is the extension of this strategy in the presence of tetraalkylammonium halides to directly and efficiently produce salts soluble in pure organic solvents and aqueous alcoholic media. This method affords gold salts that are rapidly and easily purified from byproducts using benign and easily recycled solvents and can be readily used for subsequent materials synthesis such as Au(I) salts and gold nanoparticles.

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Environmental challenges related to cyanidation in Central American gold mining; the Remance mine (Panama)

Cited by 17 publications

References 41 publications

An Overview on Coinage Metal Nanocluster-Based Luminescent Biosensors via Etching Chemistry

An Overview on Coinage Metal Nanocluster-Based Luminescent Biosensors via Etching Chemistry

Effect of Doping TiO2 NPs with Lanthanides (La, Ce and Eu) on the Adsorption and Photodegradation of Cyanide—A Comparative Study

Quantitative, room‐temperature, solvent-free mechanochemical oxidation of elemental gold into organosoluble gold salts

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