2017 年 29 巻 3 号 p. 81-86
Photocatalytic decompositions of organic compounds in aqueous titanium dioxide (TiO2) suspensions with water evaporation were investigated both experimentally and theoretically using 2,4-dinitrophenol (DNP) and methylene blue as reactants. The experimental result indicated that the concentrations of these reactants decrease more quickly than without water evaporation. This is because the water evaporation increases the reactant concentration at the TiO2 surface, thereby increasing the rate of decomposition. This acceleration of photocatalytic reaction was successfully reproduced through simulation using a power-law type kinetic reaction model constructed for the DNP decomposition. In conclusion, the photocatalytic wastewater treatment in aqueous TiO2 suspensions with water evaporation is useful to shorten the treatment time.
