Investigation into the Exothermic Laws of Degradation for o-Phenylenediamine-Containing Wastewater by the Fenton Reaction

Treatment of Azole-Containing Industrial Wastewater by the Fenton Process

“…Temperature plays a significant role in the Fenton process, although investigations that extend beyond changing the bulk liquid temperature and reporting its effect on the removal of organic compounds are scarce . The overall reaction for the decomposition of hydrogen peroxide is highly exothermic and results in the production of oxygen and water: …”

“…The extent of the temperature increase in the solution during the Fenton process will (in)directly depend on the amount of the catalyst (iron) present, the concentration of hydrogen peroxide, the concentrations and types of inorganic ions, and in the presence of organic compounds, the thermochemical nature of their oxidative degradation. 33 Figure 3a shows bulk liquid temperature profiles for the Fenton process (control, no organic compounds) and DGA and pyrazole as individual compounds. Notably, inorganic fluoride was not present in the solution for these experiments.…”

Preparation of Fe3O4@CSAC catalyst and its degradation performance and heat release mechanisms in sewage degradation

“…Subsequently, as the concentration of H 2 O 2 continued to increase, the excess cOH and other free radicals produced by catalytic H 2 O 2 were quenched (an exothermic reaction). As DT was linked to the amount of cOH and other free radicals produced by catalytic decomposition, 37 it continued to rise along with the increasing H 2 O 2 concentration.…”

“…This trend was attributed to the relationship between DT and h and the concentration of cOH. 37 When the dosage of Fe 3 O 4 @CSAC was less than 266 g L −1 , owing to insufficient Fe 3 O 4 @CSAC, the catalytic speed of H 2 O 2 decomposition into cOH was slow. As the dosage increased, the number of active sites within the system increased, accelerating the decomposition of H 2 O 2 into cOH.…”

Synergistic Effect of dark and photoreactions on the removal and photo-decolorization of azo carmosine dye (E122) as food dye using Rutile- TiO2 suspension

“…Based on figures 6 and 7 and Table 1, the activation energy for photo reaction during without and with the addition of Fenton is found to be lower that refers to the reaction is fast in both cases. The enthalpies values refer to both reactions are exothermic, but the photo Fenton is favor thermodynamically because the enthalpy with using photo Fenton reaction is more than values without Photo Fenton reaction, which enhances the generalization of hydroxyl radical, according to the following equation [49][50][51][52]. In both cases, The photoreaction for decolorization of this dye is exothermic (-ΔH # ), less random(-ΔS # ) and spontaneous (-ΔG # ).…”