Abstract
A 22 factorial design of experiments complemented with a central point assayed in triplicate was proposed to investigate the influence of initial Fenton’s reagent (H2O2 and Fe2+) concentration on the maximum oxidation of the Ponceau 4R dye in aqueous solution. The reactions took place in batch reactors without (Fenton process) and with (photo-Fenton process) UV irradiation under well-stirred conditions at approximately 25 °C. Based on these preliminary results, the kinetics of color degradation, removal of total organic carbon and consumption of reactants was experimentally investigated for 7200 s at optimal initial concentration of H2O2 and Fe2+. The results show that the Fenton and photo-Fenton process caused approximately 95% of decoloration after only 300 s of reaction and complete color degradation at 7200 s. At this final time of reaction, TOC removals of 97% and approximately 100% were observed when applying Fenton and photo-Fenton conditions, respectively. A toxicity assay revealed that A. salina was not sensitive to the synthetic effluent treated by the photo-Fenton process and diluted with aqueous nutritive solution at 25, 12.5, 10 and 5%. A suggested simplified mechanism involving three elementary reactions was able to reproduce the experimental kinetic results of Fe2+, H2O2 consumption, Fe3+ formation and azo dye degradation. On the whole, the results obtained at the investigated conditions show that the photo-Fenton and Fenton processes are effective processes to achieve TOC reduction and color degradation of Ponceau 4R dye typically found in liquid effluents from the Brazilian confectionary industries.
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Abbreviations
- A :
-
Absorbance of aqueous solution of Ponceau 4R (mAu)
- E 1 :
-
Main effect of the initial concentration of H2O2 on dye degradation
- E 2 :
-
Main effect of the initial concentration of Fe2+ on dye degradation
- E 12 :
-
Effect of the interaction between [H2O2]o and [Fe2+]o on dye degradation
- k 1 :
- k 2 :
- k 3 :
- t :
-
Time (s)
- T :
-
Temperature (°C)
- X 1 :
-
Coded variable defined in Eq. 9
- X 2 :
-
Coded variable defined in Eq. 10
- Y :
-
Dimensionless concentration of Ponceau 4R dye
- α :
-
Tuned parameter of the simplified kinetic model (Table 2) (dimensionless)
- λ :
-
Wavelength (nm)
- [C20H11N2O10S3Na3]:
-
Concentration of Ponceau 4R (mM)
- [Fe2+]:
-
Concentration of Fe2+ (mM)
- [Fe3+]:
-
Concentration of Fe3+ (mM)
- [H2O2]:
-
Concentration of hydrogen peroxide (mM)
- [HO2 •]:
-
Concentration of HO2 • (mM)
- [H+]:
-
Concentration of H+ (mM)
- [OH-]:
-
Concentration of OH- (mM)
- [•OH]:
-
Concentration of •OH (mM)
- calc:
-
Calculated
- exp:
-
Experimental
- o:
-
Initial
- high:
-
Highest level of the initial concentration of H2O2 or Fe2+ in Table 1
- low:
-
Lowest level of the initial concentration of H2O2 or Fe2+ in Table 1
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Benincá, C., Peralta-Zamora, P., Camargo, R.C. et al. Kinetics of oxidation of ponceau 4R in aqueous solutions by Fenton and photo-Fenton processes. Reac Kinet Mech Cat 105, 293–306 (2012). https://doi.org/10.1007/s11144-011-0392-2
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DOI: https://doi.org/10.1007/s11144-011-0392-2