Diffuse reflectance infrared Fourier transform spectroscopic study of the adsorption mechanism of oleate on haematite

Synthesis of Ultrahigh Molecular Weight Polyethylene Using MgO/MgCl2/TiCl4 Core–Shell Catalysts

“…It was plausible that the carboxylate head group of MO was directly bonded to surface Mg atoms (COOMg) as a result of the dealcoholization reaction with surface hydroxyl groups. The peak separation (Δ) between ν as (COO − ) and ν s (COO − ) can be utilized to distinguish the type of interaction . The Δ value of 170 cm −1 for the MOMgO sample was associated with interaction in a bridging mode, where comparable intensities for ν as (COO − ) and ν s (COO − ) further suggested that the carboxylate head group coordinated on Mg atoms with its orientation outward from the surfaces .…”

“…The peak separation (Δ) between ν as (COO − ) and ν s (COO − ) can be utilized to distinguish the type of interaction . The Δ value of 170 cm −1 for the MOMgO sample was associated with interaction in a bridging mode, where comparable intensities for ν as (COO − ) and ν s (COO − ) further suggested that the carboxylate head group coordinated on Mg atoms with its orientation outward from the surfaces . After chlorination using TiCl 4 , the peaks belonging to ν as (COO − ) and ν s (COO − ) disappeared, while the peaks at 1262, 1094–1019, and 801 cm −1 , corresponding to the stretching vibration of CO, the stretching vibration of terminal and bridging CO(Ti), and the stretching vibration of TiO, became evident.…”

The effect of calcium ions and sodium silicate on the adsorption of a model anionic flotation collector on magnetite studied by ATR-FTIR spectroscopy

“…The mechanism of fatty acid adsorption on calcareous and iron oxide minerals has been studied extensively [21][22][23][24][25][26] since 1965, when Peck and Wadsworth published their results on the adsorption of oleate on fluorite and barite [27]. The development of infrared external and internal reflection techniques provided the possibility to carry out in situ studies of collector/mineral systems, which are important since such studies provide real-time information about the complexes formed at the solid-liquid interface.…”

An Infrared Study of a Polyacrylate Flocculant Adsorbed on Hematite

“…To identify the mechanism of adsorption, we have obtained the infrared spectra of a 100% polyacrylate flocculant adsorbed on hematite at various pH values (7−14) and of its sodium salt. Diffuse reflectance infrared fourier transform (DRIFT) spectroscopy was used as it is a convenient means of obtaining surface specific infrared data, − and hematite was chosen as the substrate since it is one of the major minerals found in Bayer residues. , Attempts to use Raman spectroscopy were unsuccessful as the adsorbed species could not be detected using FT and dispersive instrumentation.…”