Fig. 16
Fluorescence spectra of coumarin solution with kraft lignin, soda lignin, KL/TiO2-1.0, SL/TiO2-1.0 and TiO2 after being irradiated under sunlight for a 20 min, b 40 min, c 60 min, d 80 min, e 100 min
Fig. 16 | BMC Chemistry