Abstract
In this work, degradation of the anthraquinonic dye Acid Blue 25 by non-thermal plasma at atmospheric pressure with and without photocatalyst is investigated. Titanium dioxide (TiO
) is used as a photocatalyst. The dye degradation by plasma in the presence of TiO
is investigated as a function of TiO
concentration, dye concentration and pH. The degradation rate is higher in acidic solutions with pH of 2 to 4.3, especially at pH 2, and decreases to 0.38 mg L
min
with the increase of pH from 2 to 5.65. A similar effect is observed in basic media, where a higher degradation rate is found at pH = 10.3. The degradation rate increases in the presence of TiO
compared to the discharge without photocatalysis. The results show that the degradation of the dye increases in the presence of TiO
until the catalyst load reaches
0.5 g L
after which the suppression of AB25 degradation is observed. The results indicate that the tested advanced oxidation processes are very effective for the degradation of AB25 in aqueous solutions.