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A toxic endocrine disruptor, 4-n-nonylphenol, was degraded using a well-known TiO2 and a visible-light-driven BiVO4 photocatalyst under irradiation from a solar simulator. The degradation rates for both BiVO4 and TiO2 are comparable in air-saturated solution though surface area of BiVO4 is much smaller than that of TiO2. This fact indicates that BiVO4 has a great ability to degrade alkylphenols in wastewater under solar light.

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Picosecond transient infrared spectra of 4-(dimethylamino)benzonitrile (DMABN) and several isotopesubstituted samples have been recorded in the fingerprint region in acetonitrile solutions. Among several strong transient infrared bands of the intramolecular charge transfer (ICT) excited state, the band at 1276 cm -1 (for normal species) shifts to lower frequencies on 15 N, 13 C, and deuterium substitution of the dimethylamino group, and is assigned to the ring C-NMe 2 single-bond stretch. Other bands observed are attributable to vibrational modes of the benzonitrile moiety. The band frequencies obtained, together with those found in the literature, are compared with results of vibrational analyses based on CIS/6-31G level ab initio molecular orbital calculations. This treatment has made possible assignments of the bands due to the benzonitrile moiety. On the basis of the assignments, electronic structure of the ICT state is discussed. The electronic structure of the ICT state is suggested to be basically of benzenoid nature, with a significant contribution from quinoidal structure. An advanced theoretical treatment may be needed to obtain final conclusion on the structure (planar or twisted) of the ICT state.