Mechanisms of chromate adsorption on hematite

In situ ATR-FTIR investigation and theoretical calculation of the interactions of chromate and citrate on the surface of haematite (α-Fe2O3)

“…Johnston et al 5 indicated chromate mainly formed inner sphere complexes with a-Fe 2 O 3 . From a quantitative point of view, the absorbance signal of the adsorbed chromate increased as the solution pH decreased in previous large batch studies.…”

“…4 The molecular mechanisms of Cr(VI) adsorption on iron oxides were recently investigated by Johnston et al, 5 who used theoretical calculations and in situ attenuated total reected Fourier transformed infrared spectroscopy (ATR-FTIR) to elucidate the adsorption structure of Cr(VI) on the surface of hematite. Cr(VI) can also be reduced to Cr(III) using natural organic matter (NOM); this process is greatly affected by the presence of coexisting metal ions 6 and the properties of the minerals.…”

Spatial and Temporal Distribution and Pollution Assessment of Trace Metals in Marine Sediments in Oyster Bay, NSW, Australia

“…); (Foster et al 2012). The green group contained lower concentrations of variables than the red group with high percentages of sand, low percentages of mud and lower levels of trace metals except for chromium, which may be derived from heavy minerals such as hematite, contained in silty sand (Johnston and Chrysochoou 2014). However, the blue group differed completely, with high percentages of sand, low percentages of mud and low concentrations of trace metals.…”

Source identification and assessment of sediment contamination of trace metals in Kogarah Bay, NSW, Australia

“…Concentrations of Ni and As decrease slightly with depth. Cr fluctuated in concentration with sediment depth (Johnston and Chrysochoou 2014). This may imply that the source of Cr is from heavy minerals such as hematite (Fig.4).…”