Parametric study on the effect of the ratios [H₂O₂]/[Fe^{3 +}] and [H₂O₂]/[substrate] on the photo-Fenton degradation of cationic azo dye Basic Blue 41

Abstract

An experimental parametric study was carried out to investigate the effects of [H(2)O(2)], [Fe(3 +)] and [H(2)O(2)]/[Fe(3 +)] ratio on the photo-Fenton degradation of a azo dye Basic Blue 41 (BB41) in aqueous solution. This method consists of coupling between Fenton's reagent and UV irradiation in order to catalyze the in situ generation of hydroxyl radicals, a powerful oxidizing agent which leads to degradation of organic pollutants until total mineralization. The kinetics study of the reaction between BB41 and hydroxyl radicals showed that the degradation of BB41 follows the first-order kinetics. It was found that the concentration of H(2)O(2) and ferric iron as well as their ratio [H(2)O(2)]/[Fe(3 +)] are key factors governing the removal of BB41 in aqueous medium and that the optimal ratio [H(2)O(2)]/[Fe(3 +)] is equal to 10 for 0.2 mM Fe(3 +) concentration. The initial BB41 concentration and the [H(2)O(2)]/[BB41] ratio are also found as significant operating parameters on the mineralization efficiency. The optimization of the operating conditions permitted to obtain a quasi-total mineralization of synthetic BB41 aqueous solutions. When these optimal conditions were applied to the real wastewater, 90% of TOC removal was obtained after 8 h of irradiation time.

Hybrid Material Based on an Amorphous-Carbon Matrix and ZnO/Zn for the Solar Photocatalytic Degradation of Basic Blue 41

“…It must be point out that the k app values for C/Zn and C/ZnO/Zn samples, ca. 9.2 × 10 −3 min −1 and 17.2 × 10 −3 min −1 , respectively, are higher or in the same magnitude order that values reported elsewhere which are in the range 2-40 × 10 −3 min −1 for more complex photocatalysts [74][75][76][77][78] than the reported in the present work. The comparison between samples can be easily obtained from the ratio k app-i /k app-ZnO since it allows further verification of the enhancement in the photocatalytic activity of a sample relative to that observed on the neat ZnO.…”

Iron-Loaded Catalytic Silicate Adsorbents: Synthesis, Characterization, Electroregeneration and Application for Continuous Removal of 1-Butylpyridinium Chloride

“…This quantity was stable throughout the process as no iron was detected during the process. The H 2 O 2 /iron ratio range from 0.15 to 15 was tested, which is within the range that other authors have studied [39]. Table 5 resumes the obtained results.…”

Coupling of membrane filtration and advanced oxidation processes for removal of pharmaceutical residues: A critical review

“…6), consequently decreasing the oxidizing power of Fenton system. Therefore, optimization of experimental parameters, most especially the quantities of Fe 2+ and H 2 O 2 , is pertinent to achieve maximum generation of • OH and to minimize the rate of waste reactions [29,157,[174][175][176].…”