Fenton-like degradation of 2,4-dichlorophenol using calcium peroxide particles: performance and mechanisms

Abstract

H2O2 was slowly released from CaO2 particle dissolution and then decomposed into radicals to degrade 2,4-dichlorophenol at a moderate rate.

Composites of Laminar Nanostructured ZnO and VOx-Nanotubes Hybrid as Visible Light Active Photocatalysts

“…It can be seen that the photodegradation efficiency of MB with the addition of isopropanol (a hydroxyl radical ( • OH) scavenger, 2 mM) and chloroform (a superoxide radical (O2 •− ) scavenger, 2 mM) was slightly decreased compared to those without the addition of quenchers. The addition of ammonium oxalate (a hole scavenger, 2 mM) did not show changes in the MB photodegradation activity [27,28]. The result of the scavenging test with chloroform and isopropanol are as seen, the removal efficiency of MB within 140 min of reaction time was decreased from 62.3% in the in the absence of the scavenger to 52.7% and 44.0%, respectively.…”

“…The addition of ammonium oxalate (a hole scavenger, 2 mM) did not show changes in the MB photodegradation activity [27,28]. The result of the scavenging test with chloroform and isopropanol are as seen, the removal efficiency of MB within 140 min of reaction time was decreased from 62.3% in the in the absence of the scavenger to 52.7% and 44.0%, respectively.…”

Oxidative Degradation of Dimethyl Phthalate (DMP) by the Fe(VI)/H2O2 Process

“…However, Fe(VI) shows a slightly increased DMP removal efficiency of 4.2% when the molar ratio of Fe(VI)/[DMP] is up to 20:1. This phenomenon can be attributed to the shielding of OH • by excessive iron ions, 30,31 as shown in eqs 3−5. Besides, the reduction of ferrate in water is caused by oxygen radicals and peroxide radicals.…”

The principle of detailed balancing, the iron-catalyzed disproportionation of hydrogen peroxide, and the Fenton reaction

“…36,215 If Fe 3+ is replaced by Fe(III) and Fe 2+ by Fe(II) the loop appears in ten other publications. 178,198,203,[217][218][219][224][225][226]229 Although conditional nomenclature is used in these papers, only one of them actually uses conditional kinetics. 198 Mechanisms using mass-action kinetics in this loop are incorrect because the first step has an inverse acid dependence as discussed in section 2.2.…”