Výsledky vyhledávání

Stabilization of iron arsenate solids by encapsulation with aluminum hydroxyl gels

Autor: Karl Leetmaa, Mario A. Gomez, George P. Demopoulos, Fuqiang Guo, L. Becze

Publikováno v: Journal of Chemical Technology & Biotechnology. 91:408-415

BACKGROUND Ferric arsenate solids in the form of scorodite (FeAsO4·2H2O) particles are suitable carriers for immobilization of arsenic-rich wastes. The stability of scorodite is, however, highly pH dependent (typically at 4≤ pH ≤7) and satisfact

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8ffb37f3254024ebc3f0e184ed788ee8
https://doi.org/10.1002/jctb.4590

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Comparative molecular characterization of aluminum hydroxy-gels derived from chloride and sulphate salts

Autor: Mario A. Gomez, George P. Demopoulos, Fuqiang Guo, Karl Leetmaa, L. Becze

Publikováno v: Journal of Chemical Technology & Biotechnology. 89:206-213

Background Aluminum (III) hydroxy-gels find important applications in areas such as paint pigments, pharmaceuticals and water treatment or toxic metal sequestration. Since the method of preparation may affect their properties and performance, in this

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7ef0dd674ac8d30f9d207b17b647fdbc
https://doi.org/10.1002/jctb.4103

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Hydrothermal reaction chemistry and characterization of ferric arsenate phases precipitated from Fe2(SO4)3–As2O5–H2SO4 solutions

Autor: L. Becze, George P. Demopoulos, J. N. Cutler, Mario A. Gomez

Publikováno v: Hydrometallurgy. 107:74-90

The hydrothermal reaction chemistry and characterization of high temperature (150–225 °C) ferric arsenate phases produced from sulfate media was studied. In particular, the effect of Fe (III)/As (V) molar ratio, temperature, and time on the phases

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9f46e8912fd28e1b20f2187a3b8d4b93
https://doi.org/10.1016/j.hydromet.2011.01.007

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Molecular and structural investigation of yukonite (synthetic & natural) and its relation to arseniosiderite

Autor: Mario A. Gomez, Robert I. R. Blyth, George P. Demopoulos, J. N. Cutler, L. Becze

Publikováno v: Geochimica et Cosmochimica Acta. 74:5835-5851

This paper describes the first synthesis method of yukonite, its thorough molecular and structural analysis along with natural specimens originating from Tagish Lake (Canada) and Grotta della Monaca (Italy) for comparison, and its structural relation

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::666098160b230027880d451fa194f99b
https://doi.org/10.1016/j.gca.2010.07.023

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The dissolution of scorodite in gypsum-saturated waters: Evidence of Ca–Fe–AsO4 mineral formation and its impact on arsenic retention

Autor: Marie-Claude Bluteau, George P. Demopoulos, L. Becze

Publikováno v: Hydrometallurgy. 97:221-227

This paper reports the results of an investigation on scorodite behavior in a gypsum-saturated aqueous environment in terms of arsenic release and solid phase transformation. The experiments were conducted at fixed pH (5–9) and temperature (22 °C

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9e34aa2735a8cfa82342ed8b0990508b
https://doi.org/10.1016/j.hydromet.2009.03.009

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The effect of copper on the precipitation of scorodite (FeAsO4·2H2O) under hydrothermal conditions: evidence for a hydrated copper containing ferric arsenate sulfate-short lived intermediate

Autor: George P. Demopoulos, Mario A. Gomez, Mert Celikin, L. Becze

Publikováno v: Journal of colloid and interface science. 360(2)

The effect of copper sulfate on scorodite precipitation and its mechanism of formation at 150 °C was investigated. Scorodite was determined to be the dominant phase formed under all conditions explored (0.61Fe(III)/As(V)1.87, 0.27-0.30 M Fe(SO(4))(1

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::670418a37d9263a261a07a7f4e6feb1b
https://pubmed.ncbi.nlm.nih.gov/21621789

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Vibrational spectroscopy study of hydrothermally produced scorodite (FeAsO4·2H2O), ferric arsenate sub-hydrate (FAsH; FeAsO4·0.75H2O) and basic ferric arsenate sulfate (BFAS; Fe[(AsO4)1−x(SO4)x(OH)x]·wH2O)

Autor: Mario A. Gomez, George P. Demopoulos, J. N. Cutler, L. Becze, Hassane Assaaoudi

Publikováno v: Journal of Raman Spectroscopy.

Three crystalline ferric arsenate phases: (1) scorodite; FeAsO4·2H2O, (2) ferric arsenate sub-hydrate (FAsH; FeAsO4·0.75H2O) and (3) basic ferric arsenate sulfate (BFAS; Fe[(AsO4)1−x(SO4)x(OH)x]·wH2O) synthesized by hydrothermal precipitation (1

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5d1f1a5af0a008214d21ca21a19a6b11
https://doi.org/10.1002/jrs.2419

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The nature of synthetic basic ferric arsenate sulfate (Fe(AsO4)1−x(SO4)x(OH)x) and basic ferric sulfate (FeOHSO4): their crystallographic, molecular and electronic structure with applications in the environment and energy

Autor: Mert Celikin, L. Becze, Hassane Assaaoudi, Mario A. Gomez, Kee Eun Lee, George P. Demopoulos, H. Putz, Gennaro Ventruti

Publikováno v: RSC Advances. 3:16840

In this study we investigate a new family of arsenate-bearing phases belonging to one set of structures (Basic Ferric Sulfate-BFS: monoclinic–orthorhombic FeOHSO4) that are significant as an industrial arsenic control material in the environment or

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5dc8ea0d7721ad1798b3d8031a6e3f80
https://doi.org/10.1039/c3ra42235f

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