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- W1973499093 abstract "A central composite rotatable design and response surface methodology were used to optimize the experimental variables of the electro-Fenton (EF) and solar photoelectro-Fenton (SPEF) degradations of 2.5 L of sulfanilic acid solutions in 0.05 M Na2SO4. Electrolyses were performed with a pre-pilot flow plant containing a Pt/air diffusion reactor generating H2O2. In SPEF, it was coupled with a solar photoreactor under an UV irradiation intensity of ca. 31 W m−2. Optimum variables of 100 mA cm−2, 0.5 mM Fe2+ and pH 4.0 were determined after 240 min of EF and 120 min of SPEF. Under these conditions, EF gave 47% of mineralization, whereas SPEF was much more powerful yielding 76% mineralization with 275 kWh kg−1 total organic carbon (TOC) energy consumption and 52% current efficiency. Sulfanilic acid decayed at similar rate in both treatments following a pseudo-first-order kinetics. The final solution treated by EF contained a stable mixture of tartaric, acetic, oxalic and oxamic acids, which form Fe(III) complexes that are not attacked by hydroxyl radicals formed from H2O2 and added Fe2+. The quick photolysis of these complexes by UV light of sunlight explains the higher oxidation power of SPEF. NH4+ was the main inorganic nitrogen ion released in both processes." @default.
- W1973499093 created "2016-06-24" @default.
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- W1973499093 date "2012-06-01" @default.
- W1973499093 modified "2023-10-17" @default.
- W1973499093 title "Optimization of the electro-Fenton and solar photoelectro-Fenton treatments of sulfanilic acid solutions using a pre-pilot flow plant by response surface methodology" @default.
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- W1973499093 doi "https://doi.org/10.1016/j.jhazmat.2012.04.053" @default.
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