Sorption Fourier transform-infrared spectroscopy

Spectroscopic techniques may provide the least ambiguous methods for verification of actual sorption mechanisms. Zeltner et al. (Chapter 8) have applied FTIR (Fourier Transform Infrared) spectroscopy and microcalorimetric titrations in a study of the adsorption of salicylic acid by goethite these techniques provide new information on the structure of organic acid complexes formed at the goethite-water interface. Ambe et al. (Chapter 19) present the results of an emission Mossbauer spectroscopic study of sorbed Co(II) and Sb(V). Although Mossbauer spectroscopy can only be used for a few chemical elements, the technique provides detailed information about the molecular bonding of sorbed species and may be used to differentiate between adsorption and surface precipitation. 

Highly cubic ordered cobalt oxides have been successfully synthesized from KlT-6 by an accurately controlled incipient wetness approach. The adding volume of cobalt nitrate and absolute ethanol were determined by the pore volume of KIT-6, and the synthesis procedure is effective and economical. Furthermore, the obtained mesoporous cobalt oxides have better mesostructure comparing with those of former reports. The X-ray diffraction, N2 sorption isotherms, transmission electron microscopy (TEM), energy-dispersive spectroscopy (EDS) and Fourier-transform infrared spectroscopy were used to characterize the as-synthesized mesoporous cohalt oxides. 

FI-MS Fluoride ion (chemical ionization) mass spectrometry FTIR Fourier transform infrared spectroscopy Kd Sorption distribution coefficient... 

Ceckiewicz, in Fourier transform infrared spectroscopy (FTIR) studies of methanol sorption on zeolite at 25 50°C, observed the propylene band pattern but failed to detect ethylene [96]. Upon temperature-programmed desorption, however, C -C olefins were identified. In the suggested MTO scheme (Fig. 16), the propylene was nominated as a primary product (ie, obtained directly from MeOH or DME), and the formation of the other products occurs via two parallel routes. 

Differential scanning calorimetry and Fourier transform infrared spectroscopy techniques were used to study the structure of water molecules in polyvinyl alcohol and polyethylene grafted acrylate hydrophilic polymers. Varying amounts of water were added to test samples and the samples conditioned to the sorption equilibrium state in sealed containers for 24 hours prior to evaluation. It was concluded that below a threshold water content, depending on the polymers physical and chemical stmcture, water molecules absorbed in hydrophilic polymer cannot form ice crystals in the polymer matrix. Above this threshold content, the water crystallises but below zero. It was also demonstrated that the absorbed water in hydrophilic polymers develops differing hydrogen bonds in the first and second hydration layers. It was concluded that the potential influence of these intermolecular interactions should therefore be taken into account whenever a polymer is used with a solvent. 25 refs. 

The work reported here was undertaken as part of an investigation of the surface properties of calcium hydroxide and of its thermal decomposition products. In this part of the work we have studied the adsorption of nitrogen and the sorption of water vapour after outgassing samples taken from a commercial grade of Ca(OH)2 at different temperatures. We have carried out other studies using thermal analysis (TG and DT analysis), electron microscopy and Fourier-transform infrared spectroscopy -. Those results will be presented at subsequent publications. 

Fourier transform infrared spectroscopy was used to monitor samples of Ca(OH>2 before and after the measurement of water sorption isotherms after outgassing at 298K. Comparison of... 

Identification of the specific species of the adsorbed oxyanion as well as mode of bonding to the oxide surface is often possible using a combination of Fourier Transform Infrared (FTIR) spectroscopy, electrophoretic mobility (EM) and sorption-proton balance data. This information is required for selection of realistic surface species when using surface complexation models and prediction of oxyanion transport. Earlier, limited IR research on surface speciation was conducted under dry conditions, thus results may not correspond to those for natural systems where surface species may be hydrated. In this study we review adsorbed phosphate, carbonate, borate, selenate, selenite, and molybdate species on aluminum and iron oxides using FTIR spectroscopy in both Attenuated Total Reflectance (ATR) and Diffuse Reflectance Infrared Fourier Transform (DRIFT) modes. We present new FTIR, EM, and titration information on adsorbed arsenate and arsenite. Using these techniques we... 

Hallinan DT Jr, Elabd YA (2007) Difusion and sorption of methanol and water in Nafion using time-resolved Fourier transform infrared-attenuated total reflectance spectroscopy. J Phys Chem B 111 13221-13230... 

---