Surface reactivity of anatase particles towards phosphated species

This multi-scale and multi-technique work investigates the adsorption of phosphated species on TiO 2 anatase surface. Our original approach declines for first time progressive ethyl substitution phosphates to identify structure complexes formed upon these molecules in aqueous dispersions, under various pH conditions. To quantify adsorbed amount , isotherms were recorded as a function pH. In parallel, zeta potential measurements performed screen evolution surface charge presence compounds. Lastly, was characterized using spectroscopic methods: solid-state 31 P Nuclear Magnetic Resonance, Attenuated Total Reflectance Fourier Transform Infrared, Diffuse Infrared Spectroscopy near infrared spectral range. Upon decreasing pH, increases, reaching maximum 1.5 phosphorus atom per nm at 2. Monoethyl-phosphate remains similar amounts orthophosphate, but di- tri-ethyl substitutions lead sharp decrease adsorption. Spectroscopic analyses reveal affinity othophosphate monoethyl-phosphate surface, with formation bridging or chelating bidentate complexes, more less protonated according values.