The adsorption of phosphate ions from aqueous solution onto thin films colloidal TiO2 has been studied for the first time by in situ internal reflection infrared spectroscopy. Phosphate binds strongly to TiO2, as evidenced large changes PO stretching band structure spectrum adsorbed species compared with species. Langmuir binding constant at pH = 2.3 is (3.8 ± 0.8) × 104 dm3 mol-1, which similar constants bidentate ligand such oxalate and catechol. strength also apparent kinetics adsorption,...

An innovative approach has been used to probe the molecular nature of metal oxide/aqueous solution interface. Internal reflection spectroscopy thin colloidal TiO2 films, under aqueous solutions pH 11.7−2.3, obtain differential in situ infrared spectra related interfacial species. alkaline wash films was shown remove contaminants arising from sol evaporation−film deposition process. Specific absorptions have assigned terminal Ti−OH and Ti−OH2+, adsorbed water Ti−OH2, bridging Ti−OH+−Ti...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew Sol-Gel Attenuated Total Reflection Infrared Spectroscopic Method for Analysis of Adsorption at Metal Oxide Surfaces in Aqueous Solutions. Chelation TiO2, ZrO2, and Al2O3 by Catechol, 8-Quinolinol, AcetylacetonePaul A. Connor, Kevin D. Dobson, James McQuillanCite this: Langmuir 1995, 11, 4193–4195Publication Date (Print):November 1, 1995Publication History Published online1 May 2002Published inissue 1 November...

Silica has been frequently studied using infrared and Raman spectroscopy due to its importance in many practical contexts where surface chemistry plays a vital role. The majority of these studies have utilized chemical-vapor-deposited films vacuo after high-temperature calcination. However, room-temperature hydration dehydration thin silica particle not well characterized spite the such as substrates for polymer surfactant adsorption. present study ATR-IR exposed varying humidity clearly...

M. Fleischmann, P. J. Hendra and A. McQuillan, Chem. Soc., Commun., 1973, 80 DOI: 10.1039/C39730000080

Antimonate ions adsorb to iron oxides in mining contexts, but the nature of adsorbed antimonate species has not frequently been investigated. In this study, ATR-IR spectroscopy was used reveal that adsorption Sb(OH)6- ion from aqueous solutions onto an amorphous oxide particle film is accompanied by changes spectrum and loss OH stretching absorptions surface hydroxyl groups. These spectral upon imply inner-sphere interaction with formation Sb-O-Fe bonds as well some outer-sphere adsorption....

CdSexSy nanocrystals were synthesized in eight solvents that have different coordinating properties, trioctylphosphine oxide, trioctylphosphine, triphenylphosphine, oleylamine, hexadecylamine, dioctylamine, trioctylamine, and 1-octadecene at 230−300 °C. These exhibited high photoluminescence, which could be tuned over most of the visible region by changing Se/S ratio or solvent. The characterized using UV−vis IR spectroscopy, TEM, EDS, XRD, NMR. 31P NMR studies provided vital information...

Internal reflection infrared spectroscopy has been used to investigate the formation and nature of surface carbonates on ZrO2 sol−gel films. Films prepared in atmospheres CO2 air exhibited an enhancement bands 1600−1300 cm-1 spectral region compared films Ar atmosphere. This is due from reaction atmospheric with metal oxide film. Both bidentate carbonate bicarbonate species are formed. For situ solution adsorption studies, were pretreated alkaline wash remove contaminants. Adsorption dilute...

The first in situ internal reflection infrared spectroscopic study of lysine adsorption from an aqueous solution to TiO2 films is reported. spectrum adsorbed at intermediate pH ∼5−7 strongly resembles that lysine, indicating electrostatically adsorbed. At this pH, favorable electrostatic interactions occur between the cation and negatively charged film (point zero charge ∼5). A Langmuir isotherm analysis was used obtain equilibrium constant for 7.4 3 × 103 M-1, consistent with surface...

Infrared (IR) spectroscopy of thin particle films, deposited on an attenuated total reflection (ATR) crystal and immersed in solution, has high potential for investigating the chemistry solid–solution interfaces. Phenomena that can be studied include pH-dependent adsorption, photosensitization, photocatalysis, biocompatibility prosthetic materials. With films a few micrometers thick, penetration depth evanescent IR wave is sufficient to monitor surface reactions throughout area film.

Abstract The nature of various electrode‐electrolyte interfaces have been investigated using vibrational Raman spectroscopy. This novel application spectroscopy has provided previously inaccessible structural evidence on the environment close to electrode surface.

We have used attenuated total reflection infrared (ATR-IR) spectroscopy to study the model compound perfluoro(2-ethoxyethane) sulfonic acid (PES) and spectral changes induced by humidity variations improve understanding of IR spectrum Nafion. This work was supported density functional theory (DFT) calculations PES molecule ion complexes confirm assignments determine local modes that contributed specific absorptions in spectrum. The illustrates difficulties interpreting Nafion with several...

ABSTRACT Spores from four Geobacillus spp. were isolated a milk powder manufacturing line in New Zealand. Liquid sporulation media produced spore yields of ∼10 7 spores ml −1 ; purified using two-phase system created with polyethylene glycol 4000 and 3 M phosphate buffer. The zeta potentials the isolates ranged −10 to −20 mV at neutral pH, an isoelectric point between pH 4. Through contact angle measurements, found be hydrophilic had relative hydrophobicity values 10 40%, as measured by...

Oxide surfaces can promote specific lateral interactions between adsorbed species that become concentrated in orientations at an interface. In this article, situ attenuated total reflectance (ATR) IR spectra were collected over time (from 0 to approximately 100 h) as the iron oxide ferrihydrite reacted with H(4)SiO(4) (between 0.007 and 1.65 mM) a pH of 4, 7, or 10. Under all conditions, first product formed was monomeric surface distinct bands 945 880 cm(-1), bidentate (2)C complex SiO(4)...