To test the stability of the N‐TiO2 samples under UV irradiation
and evaluate the photostability and reusability of HNT, we
conducted a series of experiments to observe the photodegradation
of gaseous benzene under UV irradiation. As shown in
Fig. 10, the photocatalytic activity of HNT remains almost unchanged
after 15 use cycles, indicating that HNT exhibits excellent
photostability. Recent theoretical calculations showed that
N‐doping led to a substantial reduction of the energy cost to
form oxygen vacancies in the bulk TiO2 [39]. Many studies had
confirmed that the formation of the superoxide radicals required
oxygen vacancy sites, which could then generate active
OH• radicals [40]. Moreover, the doped nitrogen is able to avoid
recombination of photogenerated e–‐h+ by preventing electrons
from jumping back to the valence band, causing the photoinduced
electrons to be captured by the oxygen adsorbed on the
surface of the catalyst [41]. This process makes it feasible for
photogenerated electrons to transfer to the catalyst surface and
facilitates the photooxidation of gaseous benzene