2017
DOI: 10.1016/j.chemgeo.2017.01.017
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An integrated flow microcalorimetry, infrared spectroscopy and density functional theory approach to the study of chromate complexation on hematite and ferrihdyrite

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Cited by 27 publications
(20 citation statements)
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“…The concentrations of Cr(VI) in our study (50-1000 μM) favored the formation of HCrO 4 − and CrO 4 2− , which minimized the magnitude of the strong overlapping peaks associated with Cr 2 O 7 2− . 51 Moreover, these concentrations were lower than the detection limit of ATR FTIR in solution (<10 mM). 6 Cr-O stretching vibrational peaks were therefore ascribed to the adsorbed Cr(VI) species on LEP surfaces.…”
Section: In Situ Atr-ftir Spectroscopymentioning
confidence: 92%
“…The concentrations of Cr(VI) in our study (50-1000 μM) favored the formation of HCrO 4 − and CrO 4 2− , which minimized the magnitude of the strong overlapping peaks associated with Cr 2 O 7 2− . 51 Moreover, these concentrations were lower than the detection limit of ATR FTIR in solution (<10 mM). 6 Cr-O stretching vibrational peaks were therefore ascribed to the adsorbed Cr(VI) species on LEP surfaces.…”
Section: In Situ Atr-ftir Spectroscopymentioning
confidence: 92%
“…The spectra were then converted to R-space by taking the Fourier transform of χ (k). Fitting was performed simultaneously on all datasets in R-space using Artemis [ 18 ] to determine the degeneracy (N), half-path length (R), and mean-square displacement (σ 2 ) of the backscatterers, in the k range 3–12. The fitting model was identical to the model used for chromate adsorption on hematite [ 46 ], for spectra collected under the same conditions.…”
Section: Methodsmentioning
confidence: 99%
“…However, other results show that several species under any given set of experimental conditions were required in order to explain all of the observed ATR FTIR peaks of phosphate adsorbed onto goethites [ 10 ]. Specifically for chromate adsorption on iron oxides, the authors have performed several studies on ferrihydrite using complementary techniques (ATR FTIR, EXAFS, micro-calorimetry) across a wide variety of experimental conditions [ 8 , 17 , 18 ]. Collectively, these studies have shown that three possible species are present on the surface (binuclear bidentate, monodentate and outer-sphere) and the relative proportion of these is highly dependent on parameters such as the pH, surface coverage, ionic strength and presence of Al in the structure.…”
Section: Introductionmentioning
confidence: 99%
“…A number of approaches exist for the removal of Cr(VI) from water, including oxidation-reduction reactions with iron oxides ( Johnston & Chrysochoou, 2012 ; Liu et al, 2018 ), electrocoagulation ( Martín-Domínguez et al, 2018 ), ion exchange ( Kabengi et al, 2017 ). Reverse osmosis and nanofiltration membranes have also been explored for Cr removal from drinking water ( Anand et al, 2018 ).…”
Section: Introductionmentioning
confidence: 99%