Arsenic immobilization as crystalline scorodite by gas-diffusion electrocrystallization

Pozo, Guillermo; Houtven, Diane van; Fransaer, Jan; Domínguez-Benetton, Xochitl

doi:10.1039/d0re00054j

Cited by 7 publications

(6 citation statements)

References 38 publications

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“…We recently disclosed the use of GDEs for the electrosynthesis of nanoparticles of iron oxide, 17 copper and zinc hydroxychlorides (spin transition materials), 18 scorodite, 19 and mixed metal (hydr)oxide libraries (i.e., birnessite, layered double hydroxides, and spinels), 20 by a process we called gasdiffusion electrocrystallization (GDEx). In these cases, oxygen was reduced on gas-diffusion cathodes, producing hydroxyl ions (OH − ) and strong oxidants (e.g., H 2 O 2 and HO 2 − ), acting as reactive intermediates for the formation of stable nanoparticles.…”

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confidence: 99%

Synthesis of platinum group metal nanoparticles assisted by CO₂ reduction and H₂ cogeneration at gas-diffusion electrodes

et al. 2023

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confidence: 99%

Synthesis of platinum group metal nanoparticles assisted by CO₂ reduction and H₂ cogeneration at gas-diffusion electrodes

et al. 2023

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“…Finally, other studies have reported the coupling of bioanodes with the cathodic metal removal by precipitation as metal hydroxides or carbonates (Lefebvre et al ., 2012 ; Colantonio and Kim, 2016 ). Likewise, electrochemical cells that can eventually be amended with microbial bioanodes have also achieved the selective precipitation of metal (hydr)oxides, mixed metal oxides or hydroxychlorides, using gas diffusion electrocrystallization (GDEx) (Prato et al ., 2019 , 2020 ; Pozo et al ., 2020 ). GDEx can be adapted in both MFC and MEC modes, as necessary.…”

Section: Generation Iii: Electrified Biological Treatmentmentioning

confidence: 99%

“…Electrochemical cells have been used for the recovery of copper, cobalt, zinc, ammonia and terephthalic acid from various dilute metal‐containing streams, for the in‐situ production of acid, the precipitation of PbSO 4 from lead citrate leachate and leaching and extraction of rare earth elements (Maes et al ., 2017 ; Gao et al ., 2020 , 2021 ; Folens et al ., 2021 ). Alternatively, GDEx has been used for the recovery of Fe, Cu, Zn, Co, Mn, As and the platinum group metals (Prato et al ., 2019 , 2020 ; Pozo et al ., 2020 ). In the PLATIRUS project, platinum group metals have been selectively recovered (70–100%) out of complex metallurgical mixtures with > 40 different and more concentrated metals (Nicol et al ., 2021 ).…”

Section: Generation Iii: Electrified Biological Treatmentmentioning

confidence: 99%

Electrified bioreactors: the next power‐up for biometallurgical wastewater treatment

Ostermeyer

Bonin

León-Fernandez

et al. 2021

Microbial Biotechnology

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Summary Over the past decades, biological treatment of metallurgical wastewaters has become commonplace. Passive systems require intensive land use due to their slow treatment rates, do not recover embedded resources and are poorly controllable. Active systems however require the addition of chemicals, increasing operational costs and possibly negatively affecting safety and the environment. Electrification of biological systems can reduce the use of chemicals, operational costs, surface footprint and environmental impact when compared to passive and active technologies whilst increasing the recovery of resources and the extraction of products. Electrification of low rate applications has resulted in the development of bioelectrochemical systems (BES), but electrification of high rate systems has been lagging behind due to the limited mass transfer, electron transfer and biomass density in BES. We postulate that for high rate applications, the electrification of bioreactors, for example, through the use of electrolyzers, may herald a new generation of electrified biological systems (EBS). In this review, we evaluate the latest trends in the field of biometallurgical and microbial‐electrochemical wastewater treatment and discuss the advantages and challenges of these existing treatment technologies. We advocate for future research to focus on the development of electrified bioreactors, exploring the boundaries and limitations of these systems, and their validity upon treating industrial wastewaters.

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“…The hydrothermal precipitation of iron-arsenic cakes from model solutions containing iron (III) and arsenic (V) ions has been extensively discussed in the literature [20][21][22][23][24][25][26][27]; however, little information is available on the precipitation of arsenic (III) and its oxidation to As (V). Research into the oxidation kinetics of As (III) to As (V) ions under hydrothermal conditions can contribute to purification optimization of solutions obtained by processing various arsenic-containing materials.…”

Section: Introductionmentioning

confidence: 99%

Pressure Oxidation of Arsenic (III) Ions in the H3AsO3-Fe2+-Cu2+-H2SO4 System

Karimov

Rogozhnikov

Dizer

et al. 2021

Metals

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The processing of low-grade polymetallic materials, such as copper–zinc, copper–lead–zinc, and poor arsenic-containing copper concentrates using hydrometallurgical methods is becoming increasingly important due to the depletion of rich and easily extracted mineral resources, as well as due to the need to reduce harmful emissions from metallurgy, especially given the high content of arsenic in ores. Ferric arsenates obtained through hydrothermal precipitation are the least soluble and most stable form of arsenic, which is essential for its disposal. This paper describes the investigation of the oxidation kinetics of As (III) ions to As (V) which is required for efficient purification of the resulting solutions and precipitation of low-solubility ferric arsenates. The effect of temperature (160–200 °C), the initial concentration of Fe (II) (3.6–89.5 mmol/dm3), Cu (II) (6.3–62.9 of mmol/dm3) and the oxygen pressure (0.2–0.5 MPa) on the oxidation efficiency of As (III) to As (V) was studied. As (III) oxidation in H3AsO-Fe2+-Cu2+-H2SO4 and H3AsO-Fe2+-H2SO4 systems was controlled by a chemical reaction with the apparent activation energy (Ea (≈84.3–86.3 kJ/mol)). The increase in the concentration of Fe (II) ions and addition of an external catalyst (Cu (II) ions) both have a positive effect on the process. When Cu (II) ions are introduced into the solution, their catalytic effect is confirmed by a decrease in the partial orders, Fe (II) ions concentration from 0.43 to 0.20, and the oxygen pressure from 0.95 to 0.69. The revealed catalytic effect is associated with a positive effect of Cu (II) ions on the oxidation of Fe (II) to Fe (III) ions, which further participate in As (III) oxidation. The semi-empirical equations describing the reaction rate under the studied conditions are written.

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Arsenic immobilization as crystalline scorodite by gas-diffusion electrocrystallization

Abstract: Gas-diffusion electrocrystallization (GDEx) is demonstrated as an effective process for the immobilization of arsenic into stable scorodite.

Cited by 7 publications

References 38 publications

Synthesis of platinum group metal nanoparticles assisted by CO₂ reduction and H₂ cogeneration at gas-diffusion electrodes

Synthesis of platinum group metal nanoparticles assisted by CO₂ reduction and H₂ cogeneration at gas-diffusion electrodes

Electrified bioreactors: the next power‐up for biometallurgical wastewater treatment

Pressure Oxidation of Arsenic (III) Ions in the H3AsO3-Fe2+-Cu2+-H2SO4 System

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Arsenic immobilization as crystalline scorodite by gas-diffusion electrocrystallization

Abstract: Gas-diffusion electrocrystallization (GDEx) is demonstrated as an effective process for the immobilization of arsenic into stable scorodite.

Cited by 7 publications

References 38 publications

Synthesis of platinum group metal nanoparticles assisted by CO2 reduction and H2 cogeneration at gas-diffusion electrodes

Synthesis of platinum group metal nanoparticles assisted by CO2 reduction and H2 cogeneration at gas-diffusion electrodes

Electrified bioreactors: the next power‐up for biometallurgical wastewater treatment

Pressure Oxidation of Arsenic (III) Ions in the H3AsO3-Fe2+-Cu2+-H2SO4 System

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Synthesis of platinum group metal nanoparticles assisted by CO₂ reduction and H₂ cogeneration at gas-diffusion electrodes

Synthesis of platinum group metal nanoparticles assisted by CO₂ reduction and H₂ cogeneration at gas-diffusion electrodes