The photocatalytic reduction of Cr(VI) using TCF with a different
amount of chitosan during irradiation as a function of time is
shown in Fig. 6b. Results show that within 180 min of ultraviolet
light irradiation in the presence of TCF catalyst. The photocatalytic
reduction of Cr(VI) using TCF can be well explained by a pseudofirst-
order pattern. The values of photocatalytic reduction rate, r,
and kinetic constant, kobs, were calculated from the pseudo-firstorder
equations (Eq. (5)) and the and the half-life of Cr(VI), t1/2,
was determined from