title: Correlation between Adsorption and Photocatalysis in the Aqueous System Cr(VI)-TiO2
abstract: The photocatalytic removal of Cr(VI) (0.80 mM, pH 2) using various commercially available photocatalysts (P25, UV100, PC50) was revisited, with particular attention given to Cr(VI) adsorption (as a Cr(VI)-TiO2 surface complex) and the formation of a Cr(III) hydroxide layer during the photocatalytic reduction. Cr(VI) adsorption followed a quasi-Langmuir-type isotherm, and the spectra of the Cr(VI)-TiO2 surface complex were deconvoluted into two Gaussian peaks, red-shifted when a rutile phase was 
journal: Photocatalysis: research and potential