Study on the surface speciation of Fe-pillared montmorillonite and mechanism of its photocatalytic effect on degradation of ionic dye rhodamine-B

â¿¢The surface protonation constants of Namt and Femt were obtained.â¿¢The content of >FeOH2+ is correlated with the catalytic decolorization rate for the dye.â¿¢The mechanism of >FeOH2+ for the photocatalytic degradation of rhodamine-B was proposed.