ferrihydrite and thiocyanate

ferrihydrite has been researched along with thiocyanate* in 2 studies

Other Studies

2 other study(ies) available for ferrihydrite and thiocyanate

Article	Year
Unexpected Thiocyanate Adsorption onto Ferrihydrite Under Prebiotic Chemistry Conditions. Origins of life and evolution of the biosphere : the journal of the International Society for the Study of the Origin of Life, 2020, Volume: 50, Issue:1-2 The most crucial role played by minerals was in the preconcentration of biomolecules or precursors of biomolecules in prebiotic seas. If this step had not occurred, molecular evolution would not have occurred. Thiocyanate is an important molecule in the formation of biomolecules as well as a catalyst for prebiotic reactions. The adsorption of thiocyanate onto ferrihydrite was carried out under pH and ion composition conditions in seawater that resembled those of prebiotic Earth. The seawater used in this work had high Mg Topics: Adsorption; Evolution, Planetary; Ferric Compounds; Origin of Life; Thiocyanates	2020
Thiocyanate adsorption on ferrihydrite and its fate during ferrihydrite transformation to hematite and goethite. Chemosphere, 2015, Volume: 119 Thiocyanate (SCN(-)) is a toxic contaminant produced by industrial processes such as gold ore cyanidation and coal coking. The potential for remediation by adsorption of SCN(-) on ferrihydrite, the influence of sulfate (SO4(2-)) on SCN(-) adsorption, and the fate of adsorbed SCN(-) during ferrihydrite aging were studied using macroscopic techniques complemented with attenuated total reflectance-Fourier transform infrared analysis (ATR-FTIR), X-ray powder diffraction (XRD) and transmission electron microscopy (TEM). Results showed that adsorption of SCN(-) was strongly affected by the concentration of electrolyte (NaNO3) and pH, with decreases in concentration of NaNO3 and pH leading to increased SCN(-) adsorption. The adsorption isotherms can be described by the Langmuir model. While at lower concentrations (0.52-1.04 mM), the presence of SO4(2-) had little impact on SCN(-) adsorption, at a higher concentration (2.08 mM), SCN(-) adsorption was significantly inhibited. ATR-FTIR data confirmed that SCN(-) was bound as an outer-sphere complex on ferrihydrite, and this mechanism was not influenced by changes in pH or electrolyte concentration. XRD data showed that ferrihydrite transformed to a mixture of hematite and goethite at 75 °C and pH 5 in the presence and absence of SCN(-). Partitioning data revealed that during ferrihydrite transformation, all adsorbed SCN(-) was released into solution. Topics: Adsorption; Environmental Pollutants; Environmental Restoration and Remediation; Ferric Compounds; Hydrogen-Ion Concentration; Iron Compounds; Microscopy, Electron, Transmission; Minerals; Models, Chemical; Nitrates; Spectroscopy, Fourier Transform Infrared; Sulfates; Thiocyanates; X-Ray Diffraction	2015

Article

Year

Unexpected Thiocyanate Adsorption onto Ferrihydrite Under Prebiotic Chemistry Conditions.

Origins of life and evolution of the biosphere : the journal of the International Society for the Study of the Origin of Life, 2020, Volume: 50, Issue:1-2

The most crucial role played by minerals was in the preconcentration of biomolecules or precursors of biomolecules in prebiotic seas. If this step had not occurred, molecular evolution would not have occurred. Thiocyanate is an important molecule in the formation of biomolecules as well as a catalyst for prebiotic reactions. The adsorption of thiocyanate onto ferrihydrite was carried out under pH and ion composition conditions in seawater that resembled those of prebiotic Earth. The seawater used in this work had high Mg

Topics: Adsorption; Evolution, Planetary; Ferric Compounds; Origin of Life; Thiocyanates

2020

Thiocyanate adsorption on ferrihydrite and its fate during ferrihydrite transformation to hematite and goethite.

Chemosphere, 2015, Volume: 119

Thiocyanate (SCN(-)) is a toxic contaminant produced by industrial processes such as gold ore cyanidation and coal coking. The potential for remediation by adsorption of SCN(-) on ferrihydrite, the influence of sulfate (SO4(2-)) on SCN(-) adsorption, and the fate of adsorbed SCN(-) during ferrihydrite aging were studied using macroscopic techniques complemented with attenuated total reflectance-Fourier transform infrared analysis (ATR-FTIR), X-ray powder diffraction (XRD) and transmission electron microscopy (TEM). Results showed that adsorption of SCN(-) was strongly affected by the concentration of electrolyte (NaNO3) and pH, with decreases in concentration of NaNO3 and pH leading to increased SCN(-) adsorption. The adsorption isotherms can be described by the Langmuir model. While at lower concentrations (0.52-1.04 mM), the presence of SO4(2-) had little impact on SCN(-) adsorption, at a higher concentration (2.08 mM), SCN(-) adsorption was significantly inhibited. ATR-FTIR data confirmed that SCN(-) was bound as an outer-sphere complex on ferrihydrite, and this mechanism was not influenced by changes in pH or electrolyte concentration. XRD data showed that ferrihydrite transformed to a mixture of hematite and goethite at 75 °C and pH 5 in the presence and absence of SCN(-). Partitioning data revealed that during ferrihydrite transformation, all adsorbed SCN(-) was released into solution.

Topics: Adsorption; Environmental Pollutants; Environmental Restoration and Remediation; Ferric Compounds; Hydrogen-Ion Concentration; Iron Compounds; Microscopy, Electron, Transmission; Minerals; Models, Chemical; Nitrates; Spectroscopy, Fourier Transform Infrared; Sulfates; Thiocyanates; X-Ray Diffraction

2015