The photocatalytic degradation of methyl orange under visible

In order to detecting the active species during the photocatalytic reaction, isopropanol (IPA), and benzoquinone (BQ) were added into the MO solution dispersed with the CN-DPY system to capture hydroxyl radicals (OH) and the superoxide radicals (O2−), respectively, followed by the photocatalytic activity test. Moreover, N2 and O2 were bubbling in the photocatalytic reaction systems, respectively, followed by the photocatalytic activity test. Signals of radicals spin trapped by 2,2,6,6-tetramethylpiperidinyloxyl (TEMPO) were obtained using a Bruker model ESP 300 E electron paramagnetic resonance spectrometer equipped with a xenon lamp (with 420 nm filter) as the light source.