Characterisation of adsorbed layers on sulphide minerals by photoelectron spectroscopy

Adsorption of Mercaptobenzothiazole and Similar Molecules on Cadmiumsulfide: A Theoretical Study

“…The adsorption of mercaptobenzothiazole (MBT), mercaptobenzooxazole (MBO), and mercaptobenzoimidazole (MBI) at sulfide surfaces has already been the subject of several experimental investigations such as XPS [4][5][6] and X-ray absorption near edge structure (XANES) 7,8 measurements. The underlying interest in these molecules and their adsorbates on mineral surfaces is their high potential for the development of more effective froth flotation processes.…”

“…XPS investigations of MBT on pyrite suggest that the molecule binds with one of its sulfur atoms, presumably the exocyclic one, to the surface. 4 Angle-dependent XANES measurements at the N K edge of MBT on a cadmiumsulfide wafer reveal that the molecular plane of the adsorptive is tilted by 27 ( 5°with respect to the normal of the crystal face. 8 From analogue measurements at the C K edge, the molecular plane follows a tilt angle of 25 ( 5°.…”

“…The adsorption of mercaptobenzothiazole (MBT), mercaptobenzooxazole (MBO), and mercaptobenzoimidazole (MBI) at sulfide surfaces has already been the subject of several experimental investigations such as XPS − and X-ray absorption near edge structure (XANES) , measurements. The underlying interest in these molecules and their adsorbates on mineral surfaces is their high potential for the development of more effective froth flotation processes. , The adsorptives under study are prototypes of a promising class of new collector molecules that allow the flotation process to be carried out at neutral pH values and that are capable of selecting ores with more complex compositions.…”

In situ study of the deterioration of thiazole/gold and thiazole/silver interfaces during interfacial ion transport processes

“…The processes of oxygen reduction induced electrolyte spreading in fact will differ between gold and silver. Small variations in the adsorption geometry and packaging density of the monolayer on gold and silver surfaces should be already resulting from varying S-Au and S-Ag bonding parameters [46,54]. Moreover, the SKP reveals different potential levels for the areas of oxygen reduction.…”

“…Peaks were fitted assuming an area ratio of 1:2 for S2p 1/2 :S2p 3/2 and a splitting of 1.2 eV for the doublets [40,41]. The peak at 162.4 eV corresponds to exocyclic sulphur, the peak at 164.1 eV to the overlap of contributions from endocyclic sulphur, unbound MBT and disulfide bridges of the MBT dimer 2,2 0 -dithiobisbenzothiazole [33,[45][46][47][48]. It is unlikely that the monolayer degraded due to its exposure to X-ray radiation during the XPS measurement [44,49].…”