The effect of sodium hydroxide in photolytic and photocatalytic degradation of Acid Blue 29 and Ethyl Violet

The photodegradation of Acid Blue 29 and Ethyl Violet in the presence/absence of sodium hydroxide (NaOH) was investigated. The results show that the dyes degrade efficiently in the presence of 2 M NaOH. The addition of titanium dioxide as a catalyst and hydrogen peroxide as an oxidant, however, does not enhance the degradation rate of the dyes.