*2.6. E*ff*ect of [H2O2]*/*[Fe2*+*] on Responses*

The increasing of [H2O2]/[Fe2+] value (studied at molar ratio 1:1, 2:1 and 3:1) showed a significant positive effect only on the values of D% MB. Gulkaya, Surucu and Dilek [29] studied the treatment of wastewater from carpet dyes by Fenton technologies, also finding that [H2O2]/[Fe2+] plays a crucial role in the removal of dyes. Considering the above, it is possible to indicate that it is necessary to maintain a considerable concentration of H2O2, to ensure that the ·OH production is maintained for a longer time, obtaining a high efficiency in the discoloration of MB. However, the values of [H2O2]/[Fe2+] do not seem to significantly affect the kapp MB and IuLog EC values.
