In situ investigation of the adsorption of styrene phosphonic acid on cassiterite by FTIR-ATR spectroscopy

In Situ Investigation of the Adsorption of Styrene Phosphonic Acid on Cassiterite (110) Surface by Molecular Modeling

“…The recovery of cassiterite remained above 85% in the pH range 4.3-6.06. When the pH value was around 4.3, the recovery of cassiterite reached a peak value 88.56%, which agreed well with the pH value 4.5 [21] used in industrial practice. However, once the pH values of the solutions entered the alkaline region, the recovery of cassiterite decreased rapidly.…”

“…Kuys and Roberts [21] speculated the adsorption of SPA on cassiterite resulted in a four-membered chelate ring based on their FTIR spectra. However, four-membered chelate rings are thermodynamically unstable [6].…”

“…Wottgen [20] examined the adsorption of phosphonic acids on cassiterite with radioactively labelled collectors and concluded that the adsorption was a chemical reaction process with the hydroxyl groups replaced by phosphonate groups. Kuys and Roberts [21] studied the adsorption of SPA on cassiterite by Fourier transform infrared attenuated total reflectance spectroscopy. They found the monoanions of SPA were the dominant species in the flotation pH range 3-5, and their findings supported the conclusion proposed by Wottgen [20] that SPA adsorbed on cassiterite via ion exchange chemisorption and formed a monodentate complex, as shown in Figure 1.…”

Modification of BaTiO3 thin films: adjustment of the effective surface work function

“…The adsorbed state of this modifier has been investigated before by IR techniques, 18,19,25,26,30,31 and these studies have suggested that phosphonic acids can attach to metal oxide surfaces through i) monodentate binding (through a P-O-M bond, with free P-O-H and PLO moieties), ii) bidentate binding (two P-O-M bonds, where M may or may not be the same atom, and where the free moiety could be either P-O-H or PLO) or, iii) tridentate binding (three P-O-M bonds, no free polar moieties). 19,27,32,33 Without capturing both the IR spectra of the neutral molecule, along with the monobasic and dibasic salts of the phosphonic acid, it is difficult to distinguish between tridentate and bidentate binding modes.…”

Interaction of ester and acid groups containing organic compounds with iron oxide surfaces

“…Spectrum I contains a peak at 1033 cm −1 and a shoulder around 950 cm −1 that are assigned to ν(P O). This Binding of organic compounds to steel studied by IRRAS 13 corresponds to ATR measurements on tin phosphonates by Kuys and Roberts [30], who assigned peaks at 993 and 937 cm −1 to ν as (P O) and to ν s (P O), respectively.…”