Andreas C. Scheinost
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View article: Novel pathway of chalcopyrite formation at low temperature in microenvironments of acidic, metal-rich sediments
Novel pathway of chalcopyrite formation at low temperature in microenvironments of acidic, metal-rich sediments Open
Chalcopyrite (CuFeS2) is the main source of copper worldwide and is usually formed at high temperature. Its occurrence at low temperature is poorly documented, and the mechanisms controlling its formation remain uncertain. We found evidenc…
View article: Single rhenium atoms on nanomagnetite: Probing the recharge process that controls the fate of rhenium in the environment
Single rhenium atoms on nanomagnetite: Probing the recharge process that controls the fate of rhenium in the environment Open
Understanding the redox transitions that control rhenium geochemistry is central to paleoredox and geochronology studies, as well as predicting the fate of chemically similar hazardous oxyanions in the environment such as pertechnetate. Ho…
View article: Microbial mediation in chalcopyrite formation at low temperature
Microbial mediation in chalcopyrite formation at low temperature Open
Chalcopyrite (CuFeS 2 ) is an important source of copper, typically found in high-temperature ore deposits. Its precipitation at low temperature has been rarely documented and remains a topic of debate. In this study, we report the trans…
View article: Incorporation Mechanism of Tc(IV) in Magnetite Revealed by EXAFS Measurements and Ab Initio Simulations
Incorporation Mechanism of Tc(IV) in Magnetite Revealed by EXAFS Measurements and Ab Initio Simulations Open
The reductive immobilization of Tc, a long-lived fission product present in nuclear waste, is an important geochemical mechanism regarding Tc transport in the repository near-field. Based on the ionic radius and similarity in charge, Tc(IV…
View article: Immobilization of Chromium by Iron Oxides in Nickel–Cobalt Laterite Mine Tailings
Immobilization of Chromium by Iron Oxides in Nickel–Cobalt Laterite Mine Tailings Open
Mine tailings generated from hydrometallurgical processing of nickel-cobalt laterite deposits contain high levels of chromium (Cr), with the hexavalent species being a toxic pollutant and carcinogen. However, the partitioning, speciation, …
View article: Influence of structural Fe content in clay minerals on selenite redox reactions: Kinetics and structural transformations
Influence of structural Fe content in clay minerals on selenite redox reactions: Kinetics and structural transformations Open
Redox reactions control the environmental fate of selenium, an element of concern due to its small gap between beneficial and detrimental effects on human health and due to the longevity of the radionuclide 79Se produced in nuclear reactor…
View article: Ab initio modelling of magnetite surfaces for radionuclide retention
Ab initio modelling of magnetite surfaces for radionuclide retention Open
In many European countries (e.g., France, Switzerland), thick steel casks are foreseen for the containment of high-level radioactive waste in deep geological repositories. In contact with pore-water, steel corrodes forming mixed iron oxide…
View article: Oxidation State and Structure of Fe in Nontronite: From Oxidizing to Reducing Conditions
Oxidation State and Structure of Fe in Nontronite: From Oxidizing to Reducing Conditions Open
The redox reaction between natural Fe-containing clay minerals and its sorbates is a fundamental process controlling the cycles of many elements such as carbon, nutrients, redox-sensitive metals, and metalloids (e.g., Co, Mn, As, Se), and …
View article: Immobilization of technetium by iron corrosion phases: lessons learned and future perspectives
Immobilization of technetium by iron corrosion phases: lessons learned and future perspectives Open
Technetium-99 (99Tc) is a long-lived fission product (2.13×105 years) of uranium-235 (235U) and plutonium-239 (239Pu) and, therefore, of great concern for the long-term safe management of nuclear waste. The migration of Tc in the environme…
View article: Chemistry of the Interaction and Retention of Tc<sup>VII</sup> and Tc<sup>IV</sup> Species at the Fe<sub>3</sub>O<sub>4</sub>(001) Surface
Chemistry of the Interaction and Retention of Tc<sup>VII</sup> and Tc<sup>IV</sup> Species at the Fe<sub>3</sub>O<sub>4</sub>(001) Surface Open
The pertechnetate ion TcVIIO4 - is a nuclear fission product whose major issue is the high mobility in the environment. Experimentally, it is well known that Fe3O4 can reduce TcVIIO4 - to TcIV species and retain such products quickly and c…
View article: REDUCTIVE IMMOBILIZATION OF <sup>99</sup>Tc(VII) BY PYRITE AND MARCASITE
REDUCTIVE IMMOBILIZATION OF <sup>99</sup>Tc(VII) BY PYRITE AND MARCASITE Open
99 Tc is a fission product with a long half-life of 2.14 × 10 5
View article: Selenium Nanowire Formation by Reacting Selenate with Magnetite
Selenium Nanowire Formation by Reacting Selenate with Magnetite Open
The mobility of 79Se, a fission product of 235U and long-lived radioisotope, is an important parameter in the safety assessment of radioactive nuclear waste disposal systems. Nonradioactive selenium is also an important contaminant of drai…
View article: Shedding Light on the Enigmatic TcO <sub>2</sub> ⋅ <i>x</i> H <sub>2</sub> O Structure with Density Functional Theory and EXAFS Spectroscopy**
Shedding Light on the Enigmatic TcO <sub>2</sub> ⋅ <i>x</i> H <sub>2</sub> O Structure with Density Functional Theory and EXAFS Spectroscopy** Open
The β‐emitting 99 Tc isotope is a high‐yield fission product in 235 U and 239 Pu nuclear reactors, raising special concern in nuclear waste management due to its long half‐life and the high mobility of pertechnetate (TcO 4 − ). Under the c…
View article: Supplementary CIF files for "Shedding Light on the Enigmatic TcO2 ⋅ xH2O Structure with Density Functional Theory and EXAFS Spectroscopy"
Supplementary CIF files for "Shedding Light on the Enigmatic TcO2 ⋅ xH2O Structure with Density Functional Theory and EXAFS Spectroscopy" Open
Optimized geometries from the paper "Shedding Light on the Enigmatic TcO2 ⋅ xH2O Structure with Density Functional Theory and EXAFS Spectroscopy" (https://doi.org/10.1002/chem.202202235), provided in CIF format. All structures were fully o…
View article: Supplementary CIF files for "Shedding Light on the Enigmatic TcO2 ⋅ xH2O Structure with Density Functional Theory and EXAFS Spectroscopy"
Supplementary CIF files for "Shedding Light on the Enigmatic TcO2 ⋅ xH2O Structure with Density Functional Theory and EXAFS Spectroscopy" Open
Optimized geometries from the paper "Shedding Light on the Enigmatic TcO2 ⋅ xH2O Structure with Density Functional Theory and EXAFS Spectroscopy" (https://doi.org/10.1002/chem.202202235), provided in CIF format. All structures were fully o…
View article: Shedding light on the enigmatic TcO2·xH2O structure with density functional theory and EXAFS spectroscopy
Shedding light on the enigmatic TcO2·xH2O structure with density functional theory and EXAFS spectroscopy Open
The β-emitting 99Tc isotope is a high-yield fission product in 235U and 239Pu nuclear reactors, raising special concern in nuclear waste management due to its long half-life and the high mobility of pertechnetate (TcO4−). In the conditions…
View article: Pbx(OH)y cluster formation in STI framework-type zeolites: anomalous thermal behaviour and increased thermal stability
Pbx(OH)y cluster formation in STI framework-type zeolites: anomalous thermal behaviour and increased thermal stability Open
For the first time, the structural investigation of a Pb-exchanged zeolite (Pb 13.4 (OH) 10 Al 17.4 Si 54.6 O 144 ∙38H 2 O) with STI framework type, revealed a highly unusual and intriguing sudden volume increase under continuous heating. …
View article: Oxidation of Micro- and Nanograined UO<sub>2</sub> Pellets by In Situ Synchrotron X-ray Diffraction
Oxidation of Micro- and Nanograined UO<sub>2</sub> Pellets by In Situ Synchrotron X-ray Diffraction Open
When in contact with oxidizing media, UO2 pellets used as nuclear fuel may transform into U4O9, U3O7, and U3O8. The latter starts forming by stress-induced phase transformation only upon cracking of the pristine U3O7 and is associated with…