“…For g-C 3 N 4 , the photo-excited hole cannot generate ˙OH due to the lower VB position, and the observed ˙OH signal may be related to further reduction of ˙O 2 − . 11,42,43 For WG-4, both ˙O 2 − and ˙OH signals could be observed. Active species trapping experiments were also conducted to investigate the photocatalytic process, using isopropanol (IPA) as a ˙OH scavenger, ammonium oxalate (AO) as a h + scavenger and KBrO 3 as an e − scavenger.…”