A UV lamp (Asone, Model SLUV-4, 9 W, Japan) with a main wavelength of 254 nm was used as a light source. The absorbance of the solutions was measured every 30 min for 3 h with a UV−vis/NIR spectrometer (Perkin− Elmer, Model Lambda 750). T
A UV lamp (Asone,Model SLUV-4, 9 W, Japan) with a main wavelength of 254 nm wasused as a light source. The absorbance of the solutions was measuredevery 30 min for 3 h with a UV−vis/NIR spectrometer (Perkin−Elmer, Model Lambda 750). T