Fig. 9 displayed an effect of TiO2 concentration on the removal
rate of total organic carbon (TOC), the tendency diagram of TOC
change was quite similar to TC removal (Fig. 8) except for a conservative
amplitude variation. In the plasma-TiO2 system, TOC was
removed 53.4% with the adding dosage of 1.5 g L1 TiO2 after
24 min, while only 25.3% was degraded without the catalyst. Compared
with Fig. 8, it could be investigated that the removal efficiency
of TOC was abnormally lower than that of TC during the
reaction time, which demonstrably stated that there existed some
different transitional by-products in TC degradation process, and
the relative intermediates generated were unstable and
nondegradable.