Abstract
Three kinds of polymers, poly(p-aminobenzoic acid) (PPA), poly(m-aminobenzoic acid) (PMA), and poly(o-aminobenzoic acid) (POA), were prepared by oxidizingp-,m-, ando-aminobenzoic acid with (NH4)2S2O8in acidic solution, respectively. Poly(aminobenzoic acid)/TiO2nanocomposites PPA/TiO2, PMA/TiO2, and POA/TiO2were prepared by adsorption of PPA, PMA, and POA polymers on surface of TiO2nanocrystals ST01 and P25, respectively. The polymers and the poly(aminobenzoic acid)/TiO2nanocomposites 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 TiO2nanocrystals. 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.
Highlights
Among the various semiconductor photocatalysts, titanium dioxide is one of the most popular and promising materials, because it is stable in various solvents under photoirradiation, it is available commercially, and it can induce various types of redox reactions [1]
Three chemical reagents p-aminobenzoic acid (PAB), m-aminobenzoic acid (MAB), and o-aminobenzoic acid (OAB) were selected as the starting monomer of the polymerization for comparing the activities of these polymers as photocatalytic sensitizer, because they have a carboxyl group located on the para, meta, or ortho-position of amino-group in the benzene ring, it will be polymerized into a poly with straight-chain structure
The influences produced by amount of oxidizing agent and the acid are different in the synthesis of poly(p-aminobenzoic acid) (PPA), poly(m-aminobenzoic acid) (PMA), and poly(o-aminobenzoic acid) (POA) because of the difference of site of amino group in aminobenzoic acid
Summary
Among the various semiconductor photocatalysts, titanium dioxide is one of the most popular and promising materials, because it is stable in various solvents under photoirradiation, it is available commercially, and it can induce various types of redox reactions [1]. Three chemical reagents p-aminobenzoic acid (PAB), m-aminobenzoic acid (MAB), and o-aminobenzoic acid (OAB) were selected as the starting monomer of the polymerization for comparing the activities of these polymers as photocatalytic sensitizer, because they have a carboxyl group located on the para-, meta-, or ortho-position of amino-group in the benzene ring, it will be polymerized into a poly (aminobenzoic acid) with straight-chain structure In these polymers, the –NH2 groups can be utilized in the polymerization reaction, and carboxyl groups can be used to combine to Ti(IV) on TiO2 surface by a multi-bridging chelating coordination [16]. This difference can be attributed to the influence of site of amino group in aminobenzoic acid
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