Synthesis and Visible Photocatalytic Activities of Poly(aminobenzoic acid)‎TiO2 Nanocomposites

Abstract EN

Three kinds of polymers, poly(p-aminobenzoic acid) (PPA), poly(m-aminobenzoic acid) (PMA), and poly(o-aminobenzoic acid) (POA), were prepared by oxidizing p-, m-, and o-aminobenzoic acid with (NH4)2S2O8 in acidic solution, respectively.

Poly(aminobenzoic acid)/TiO2 nanocomposites PPA/TiO2, PMA/TiO2, and POA/TiO2 were prepared by adsorption of PPA, PMA, and POA polymers on surface of TiO2 nanocrystals ST01 and P25, respectively.

The polymers and the poly(aminobenzoic acid)/TiO2 nanocomposites were studied by FT-IR and UV-visible spectra, TG-DTA analysis, SEM observation, and measurements of isotherms and adsorption model of the polymers on TiO2 nanocrystals.

Furthermore, the visible photoelectrochemical and photocatalytic activities of these nanocomposites were investigated by the photocatalytic decomposition of water and methylene blue under visible irradiation.

These nanocomposites have exhibited higher and different the abovementioned activities.

This difference can be attributed to the influence of site of amino group in aminobenzoic acid.