Catalytic oxidation of organic pollutants in wastewater via a Fenton-like process under the catalysis of HNO₃-modified coal fly ash

Abstract

Organic wastewater can be treated effectively via a heterogeneous Fenton-like process under the catalysis of HNO3-modified coal fly ash.

Optimization Parameters, Kinetics, and Mechanism of Naproxen Removal by Catalytic Wet Peroxide Oxidation with a Hybrid Iron-Based Magnetic Catalyst

“…On the other hand, when the H 2 O 2 dosage was deficient (0.5 mM), the removal of NAP also showed a dramatic decrease due to the oxidizing agent ( • OH) concentration in the reaction not being enough. These results are in good agreement with the results obtained by Wang et al [41]. Figure 6c,d shows the combined effect between temperature and pH on the removal efficiency of NAP.…”

A Review Paper on Heterogeneous Fenton Catalyst: Types of Preparation, Modification Techniques, Factors Affecting the Synthesis, Characterization, and Application in the Wastewater Treatment

“…Figure 4 (a) displays that Acid treatment is a comparatively better option for the enhancement of catalytic activity or activation of catalyst (coal fly ash). Wang et al recommended that the 12 h of impregnation is necessary for the good catalyst [66]. Material like activated carbon can be used as a modifier.…”

“…It can be judged by taking modifier or activator. Wang et al demonstrated that acid modified catalyst is more efficient than alkali [66]. They investigated that during the acid wash, alkaline catalyst gets neutralized by acid and also observed the increased surface area and pore volume, i.e.…”

“…Wang et al used three different temperatures to study the rigidity of metal coal fly ash. The optimized temperature was 723 K (Figure 13 (a)), as at this temperature pores have not been broken and along with that surface area was also increased with rigidity [66]. With the increase in calcinations temperature, evaporation occurs, gas produced and spread rapidly over the surface.…”

Fenton Reagent for Organic Compound Removal in Wastewater

“…Therefore, neutral pH can be used to reduce effluent costs. Also, Wang et al [68] had used HNO3-modified coal fly ash (HFA) to perform an oxidation reaction in the treatment of p-Nitrophenol pollutants, in which it is proven to be effective, stable, and reusable up to 9 runs of application with retaining removal percentage of > 91% after 9 runs. Increasing the temperature of the system does increase the efficacy of the treatment, but it is also imperative that the cost of said higher temperature be taken into account.…”