Respective Role of Fe and Mn Oxide Contents for Arsenic Sorption in Iron and Manganese Binary Oxide: An X-ray Absorption Spectroscopy Investigation

2014 ◽  
Vol 48 (17) ◽  
pp. 10316-10322 ◽  
Author(s):  
Gaosheng Zhang ◽  
Fudong Liu ◽  
Huijuan Liu ◽  
Jiuhui Qu ◽  
Ruiping Liu
Keyword(s):  
Absorption Spectroscopy ◽  
Binary Oxide ◽  
X Ray ◽  
Respective Role ◽  
Mn Oxide ◽  
Fe And Mn ◽  
X Ray Absorption ◽  
Iron And Manganese

scholarly journals Iron Speciation in Different Saharan Dust Advections and Effect of the Procedural Blank on the Results From X-ray Absorption Spectroscopy and Selective Leaching Experiments

Atmosphere ◽  
2020 ◽  
Vol 11 (7) ◽  
pp. 735
Author(s):  
Chiara Petroselli ◽  
Beatrice Moroni ◽  
Stefano Crocchianti ◽  
Roberta Selvaggi ◽  
Francesco Soggia ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Saharan Dust ◽  
Residual Fraction ◽  
Selective Leaching ◽  
Iron Speciation ◽  
X Ray ◽  
Fe Speciation ◽  
Leaching Experiments ◽  
X Ray Absorption

In this work, we applied X-ray Absorption Spectroscopy (XAS) and selective leaching experiments for investigating iron speciation in different dust advections collected on different unwashed quartz fiber filters. XAS analysis evidenced a predominance of Fe(III) in 6-fold coordination for Saharan dust and a trend towards Fe(II) and 4-fold coordination in the order: Saharan dust, mixed Saharan, and non-Saharan aerosol samples. The role of the sampling substrate was evaluated explicitly, including in the analysis a set of blank filters. We were able to pinpoint the possible contribution to the overall XAS spectrum of the residual Fe on quartz as the concentration decrease towards the blank value. In particular, the filter substrate showed a negligible effect on the structural trend mentioned above. Furthermore, selective leaching experiments evidenced a predominance of the residual fraction on Fe speciation and indicated the lowest Fe concentrations for which the blank contribution is <20% are 1 μ g for the first three steps of the procedure (releasing the acid-labile, reducible and oxidizable phases, respectively) and 10 μ g for the last step (dissolving the insoluble residuals).

X-ray absorption spectroscopy studies for the determination of adsorption binding modes of selenium oxoanions onto iron and manganese based nanomaterials

2012 ◽  
Vol 1480 ◽  
Author(s):  
Christina M. Gonzalez ◽  
Jason G. Parsons ◽  
Jeffrey Hernandez ◽  
Jorge L. Gardea-Torresdey
Keyword(s):  
Absorption Spectroscopy ◽  
Binding Modes ◽  
Edge Structure ◽  
X Ray ◽  
Microwave Assisted ◽  
Spectroscopy Studies ◽  
X Ray Absorption ◽  
Binding Mechanisms ◽  
Iron And Manganese

ABSTRACTIncreasing concentrations of selenium oxoanions in the environment are placing many animals at risk for reproduction failure and deformities. The understanding of binding mechanisms of selenium oxoanions to iron and manganese based oxide minerals could lead to enhanced understanding of selenium mobility in the environment. In this study, the binding mechanisms of selenium oxoanions, selenite and selenate, to non microwave-assisted and microwave-assisted synthetic Fe3O4, Mn3O4, and MnFe2O4 nanomaterials were investigated through the use of X-ray absorption spectroscopy. The X-ray absorption near-edge structure (XANES) spectroscopy studies revealed the oxidation state of selenite and selenate remains the same after binding occurs to all nanomaterials in pH 2, 4, or 6 environments. The binding modes of selenite and selenate were determined to be bidentate binuclear through use of Extended x-ray absorption fine structure (EXAFS) and were independent of nanomaterials, synthetic technique, and pH.

Role of defects in BiFeO3 multiferroic films and their local electronic structure by x-ray absorption spectroscopy

2014 ◽  
Vol 116 (15) ◽  
pp. 153701 ◽  
Author(s):  
Ashish Ravalia ◽  
Megha Vagadia ◽  
P. S. Solanki ◽  
S. Gautam ◽  
K. H. Chae ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Absorption Spectroscopy ◽  
X Ray ◽  
Multiferroic Films ◽  
Local Electronic Structure ◽  
X Ray Absorption

Assessing nickel oxide electrocatalysts incorporating diamines and having improved oxygen evolution activity using operando UV/visible and X-ray absorption spectroscopy

2021 ◽  
Author(s):  
Takafumi Miura ◽  
Shun Tsunekawa ◽  
Sho Onishi ◽  
Toshiaki Ina ◽  
Kehsuan Wang ◽  
...  
Keyword(s):  
Nickel Oxide ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Absorption Spectroscopy ◽  
Spectroscopic Techniques ◽  
X Ray ◽  
Uv Visible ◽  
X Ray Absorption

The role of diamines incorporated in a nickel oxide electrocatalyst for water splitting was examined using operando UV/XAFS spectroscopic techniques.

The state of platinum in pyrrhotite: X-ray absorption spectroscopy study and implications for the role of Fe sulphides as platinum carriers

2021 ◽  
pp. 1-43
Author(s):  
Olga N. Filimonova ◽  
Alexander L. Trigub ◽  
Maximilian S. Nickolsky ◽  
Dmitriy A. Chareev ◽  
Kristina O. Kvashnina ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
The State ◽  
Spectroscopy Study ◽  
X Ray ◽  
X Ray Absorption

In situ X-ray absorption spectroscopy study of copper under potential deposition on Pt(111): role of the anions on the Cu structural arrangement

2002 ◽  
Vol 47 (19) ◽  
pp. 3081-3091 ◽  
Author(s):  
Y. Soldo ◽  
E. Sibert ◽  
G. Tourillon ◽  
J.L. Hazemann ◽  
J.P. Lévy ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Spectroscopy Study ◽  
X Ray ◽  
Structural Arrangement ◽  
X Ray Absorption
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